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Onyx Boox Note Air 4 C Review | 68 Data compared

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  • Avg. price in UK: ~£480
  • Avg. price in US: ~$500
  • Screen size: 10.3 inches
  • Battery life: ?
  • Supported bookstore ecosystem: Android Open Ecosystem

Onyx Boox Note Air 4 C review. Compare 68 technical specifications and user reviews to see how it ranks among ereaders and if it is worth buying.

8.9

Overall score

What it is: An overall evaluation of the eReader's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best eReaders on the market.

Score components:

90.0%

9.0

Technical Score

10.0%

8.8

User score

Excellent
9.0

Technical Score

What it is: An assessment of the eReader's technical performance, covering key areas such as display quality, reading features, battery life, format support, ecosystem, and design.

When it matters: When you want to compare eReaders based on technical performance and available features.

Score components:

25.0%

9.8

Display

22.0%

9.9

Reading

18.0%

9.1

Battery

14.0%

9.4

Hardware

12.0%

8.7

Connectivity

9.0%

3.5

Design

Exceptional
8.8

User score

What it is: A rating that combines user reviews and the total number of reviews received by the eReader.

When it matters: When you want to know how an eReader feels in daily reading and how reliable it is for screen comfort, battery life, and library management according to user feedback.

Score components:

70.0%

8.3

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.1
(340)
amazon
4.2
(213)
amazon
4.1
(140)
amazon
3.9
(47)
amazon
5.0
(1)
United States
Amazon_logo.png
4.2
(227)
Amazon_logo.png
4.2
(143)

(Reviews last updated: Apr 2026)

Excellent
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    Best prices in UK

    Best rankings

    ?

    Available: ranking among products currently available (including other versions of this product).
    All: ranking among all products in the database.

    Verdict

    The Onyx Boox Note Air 4 C is a premium 10.3-inch E Ink tablet featuring a Kaleido 3 color display that provides 300 PPI for monochrome and 150 PPI for color content. It is powered by a 2.4GHz octa-core processor, 6GB of RAM, and 64GB of internal storage, which is expandable up to 2TB via a microSD card slot. Running on Android 13 with full Google Play Store access, it offers unmatched flexibility for third-party apps and multitasking through split-screen mode. Main pros include its sleek 5.8mm aluminum design, high-speed BSR (Boox Super Refresh) technology for smooth page turns, and a paper-like writing experience with the included 4,096-level pressure-sensitive stylus. However, notable cons include its relatively high price point, muted color vibrancy compared to traditional LCDs, and a 3,700mAh battery that drains significantly faster when using the color display or front lights at high intensity.

    Technical Specifications of eReader Onyx Boox Note Air 4 C

    Technical Score

    What it is: An assessment of the eReader's technical performance, covering key areas such as display quality, reading features, battery life, format support, ecosystem, and design.

    When it matters: When you want to compare eReaders based on technical performance and available features.

    Score components:

    25.0%

    9.8

    Display

    22.0%

    9.9

    Reading

    18.0%

    9.1

    Battery

    14.0%

    9.4

    Hardware

    12.0%

    8.7

    Connectivity

    9.0%

    3.5

    Design

    9.0
    Onyx Boox Note Air 4 C has a technical score of 8.95 points, which is higher than that of 99.2% of products in this category.
    User score

    What it is: A rating that combines user reviews and the total number of reviews received by the eReader.

    When it matters: When you want to know how an eReader feels in daily reading and how reliable it is for screen comfort, battery life, and library management according to user feedback.

    Score components:

    70.0%

    8.3

    User reviews

    30.0%

    10

    Popularity

    User score:
    United Kingdom
    amazon
    4.1
    (340)
    amazon
    4.2
    (213)
    amazon
    4.1
    (140)
    amazon
    3.9
    (47)
    amazon
    5.0
    (1)
    United States
    Amazon_logo.png
    4.2
    (227)
    Amazon_logo.png
    4.2
    (143)

    (Reviews last updated: Apr 2026)

    8.8
    Onyx Boox Note Air 4 C has a user score of 8.79 points, which is higher than that of 74.6% of products in this category.
    Popularity
    What it is: An indicator based on the number of reviews received by the eReader.
    When it matters: When you prefer to choose an eReader reviewed and selected by many other buyers.
    10
    Onyx Boox Note Air 4 C has a popularity of 10 points, which is higher than 70.5% of smartphones.
    Ratio quality/price

    What it is: An indicator that combines the eReader's overall rating with its cost.

    When it matters: When you are looking for an eReader with a good balance between reading comfort, features, and price.

    Score components:

    60.0%

    8.9

    Overall score

    40.0%

    8.0

    Price

    8.7
    Onyx Boox Note Air 4 C has a quality-to-price ratio of 8.7 points, which is higher than 97.5% of smartphones.
    Brand name
    What it is: Identifies the company or ecosystem behind the device, which often shapes the store, software approach, and accessory support.
    When it matters: When you are choosing between Kindle, Kobo, Boox, PocketBook, or another ecosystem with different store access and software behavior.

    Importance: MEDIUM

    Onyx
    Screen size
    What it is: The diagonal measurement of the reading panel, usually given in inches.
    When it matters: When you are deciding between a small travel reader and a larger page that works better for PDFs, comics, or textbooks.

    Importance: HIGH

    Good value: >=7.8

    10.3 inches
    Onyx Boox Note Air 4 C has a screen size of 10.3 inches which is larger than 86.9% of eReaders on this spec and equal to 11.5% of eReaders.
    Screen resolution
    What it is: The total pixel grid shown on the panel, normally written as width by height.
    When it matters: When small fonts, diagrams, or dense page layouts need to stay readable without constant zooming.

    Importance: HIGH

    1860x2480 px
    Onyx Boox Note Air 4 C uses a screen resolution of 1860x2480 px, which is sharper than that of 95.1% of eReaders and the same as that of 4.9% of eReaders.
    Pixel density
    What it is: The number of pixels packed into each inch of the display, expressed in ppi.
    When it matters: When you want text edges to look cleaner and serif fonts to resemble print more closely.

    Importance: HIGH

    Good value: >=300

    300 ppi
    Onyx Boox Note Air 4 C has a pixel density of 300 ppi which is higher than 51.6% of eReaders on this spec and equal to 48.4% of eReaders.
    150 ppi in color.
    E-paper display
    What it is: Uses an electrophoretic panel designed to mimic paper rather than a conventional backlit phone or tablet screen.
    When it matters: When you read for long stretches and want lower glare and less screen-like fatigue than on LCD or OLED devices.

    Importance: LOW

    yes
    Onyx Boox Note Air 4 C uses an e-paper display. 97.6% of eReaders have an e-paper display.
    Show more
    Supported file types
    What it is: Lists which ebook, document, image, or audio formats the reader can open without conversion.
    When it matters: When your library comes from mixed sources instead of one locked bookstore.

    Importance: HIGH

    26
    Onyx Boox Note Air 4 C supports 26 file types which is more than 96% of eReaders on this spec and equal to 4% of eReaders.
    PDF reflow support
    What it is: Can rearrange PDF text into a more readable, screen-sized layout instead of forcing the original fixed page.
    When it matters: When you read A4 documents, articles, or manuals on a smaller eReader screen.

    Importance: HIGH

    yes
    Onyx Boox Note Air 4 C offers PDF reflow. 55.4% of eReaders support PDF reflow.
    Annotation support
    What it is: Allows highlighting, handwritten notes, typed comments, or markup directly inside supported files.
    When it matters: When you study, review academic papers, or want your notes to stay attached to the exact passage.

    Importance: HIGH

    yes
    Onyx Boox Note Air 4 C offers annotation support. 100% of eReaders offer annotation support.
    Dictionary
    What it is: Provides built-in word lookup while you read.
    When it matters: When you read in another language or want quick definitions without leaving the page.

    Importance: MEDIUM

    yes
    Onyx Boox Note Air 4 C includes a built-in dictionary. 99.2% of eReaders include a built-in dictionary.
    Text-to-speech
    What it is: Converts on-screen text into spoken audio using a synthetic voice.
    When it matters: When you want to keep following a book while resting your eyes, walking, or multitasking.

    Importance: MEDIUM

    yes
    Onyx Boox Note Air 4 C offers text-to-speech. 64.2% of eReaders include text-to-speech.
    Show more
    Battery life
    What it is: Estimates how long the device can keep running between charges under normal reading conditions.
    When it matters: When you travel, commute, or want to finish books for days without thinking about charging.

    Importance: HIGH

    Good value: >=30

    ?
    Battery capacity
    What it is: The amount of energy the battery can store, commonly expressed in mAh.
    When it matters: When you want a rough hardware indicator of how much power reserve the device has.

    Importance: MEDIUM

    Good value: >=2000

    3,700 mAh
    Onyx Boox Note Air 4 C has a battery capacity of 3700 mAh which is higher than 87.5% of eReaders on this spec and equal to 4.2% of eReaders.
    Charging time
    What it is: The approximate time needed to recharge the battery from low to full.
    When it matters: When you often top up shortly before leaving and need the reader ready again quickly.

    Importance: MEDIUM

    Good value: <=3

    ?
    Wireless charging
    What it is: Can recharge on a compatible charging pad without plugging in a cable.
    When it matters: When you prefer drop-and-charge convenience on a desk or bedside stand.

    Importance: LOW

    no
    Onyx Boox Note Air 4 C does not offer wireless charging. 7.3% of eReaders offer wireless charging.
    Internal storage
    What it is: The built-in space available for books, notes, audiobooks, apps, and downloaded documents.
    When it matters: When you keep large libraries offline or store a lot of PDFs and audio locally.

    Importance: HIGH

    Good value: >=32

    64 GB
    Onyx Boox Note Air 4 C offers 64 GB of internal storage which is more than 82.2% of eReaders on this spec and equal to 11% of eReaders.
    RAM capacity
    What it is: The amount of working memory used for page rendering, multitasking, and keeping content active in the background.
    When it matters: When you open heavy files, switch between books, or expect the interface to stay snappy.

    Importance: MEDIUM

    Good value: >=2

    6 GB
    Onyx Boox Note Air 4 C offers 6 GB of RAM which is more than 97.5% of eReaders on this spec and equal to 2.5% of eReaders.
    CPU base clock speed
    What it is: The baseline operating frequency of the main processor under normal load.
    When it matters: When you compare readers for faster menu navigation, indexing, and handling of larger documents.

    Importance: MEDIUM

    8 x 2 GHz
    Onyx Boox Note Air 4 C has a CPU base clock speed of 8 x 2 GHz, which is faster than that of 82.6% of eReaders and the same as that of 12.4% of eReaders.
    Operating system
    What it is: The software platform that drives the interface, reading apps, and deeper system capabilities.
    When it matters: When you care about app availability, customization, and how flexible the device can become beyond basic reading.

    Importance: HIGH

    Android 13
    Onyx Boox Note Air 4 C runs Android 13, which is more advanced than that of 73% of eReaders of eReaders.
    Android 13
    Memory card slot
    What it is: Accepts removable storage so the library can expand beyond the built-in capacity.
    When it matters: When your collection will outgrow internal storage or you move files between devices manually.

    Importance: MEDIUM

    yes
    Onyx Boox Note Air 4 C has a memory card slot. 43.1% of eReaders have a memory card slot.
    Show more
    Wi-Fi connectivity
    What it is: Connects the reader to wireless networks for book downloads, syncing, updates, and online services.
    When it matters: When you buy books directly on the device or keep your library synced without using a cable.

    Importance: HIGH

    yes
    Onyx Boox Note Air 4 C connects over Wi-Fi. 93.5% of eReaders have Wi-Fi.
    Wi-Fi version
    What it is: Specifies which wireless networking standard is supported, such as Wi-Fi 4, 5, or 6.
    When it matters: When router compatibility, wireless stability, or faster transfers on newer home networks matter to you.

    Importance: LOW

    Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n)
    Onyx Boox Note Air 4 C supports Wi-Fi Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n), which is newer than that of 58.2% of eReaders and the same as that of 40.2% of eReaders.
    Wi-Fi bands supported
    What it is: Shows whether the reader can use 2.4 GHz, 5 GHz, or both wireless bands.
    When it matters: When crowded apartment Wi-Fi or 5 GHz-only setups make band support matter at home or in the office.

    Importance: LOW

    2.4 GHz+5 GHz
    Onyx Boox Note Air 4 C supports 2.4 GHz+5 GHz Wi-Fi bands, which is broader than that of 57.4% of eReaders and the same as that of 42.6% of eReaders.
    Bluetooth
    What it is: Provides short-range wireless pairing for headphones, speakers, keyboards, page turners, or other accessories.
    When it matters: When you listen to audiobooks, use a remote page turner, or want cable-free accessories around the house.

    Importance: MEDIUM

    yes
    Onyx Boox Note Air 4 C connects over Bluetooth. 60.2% of eReaders have Bluetooth.
    Bluetooth can pair wireless accessories.
    Bluetooth version
    What it is: Identifies the supported Bluetooth generation, which affects efficiency, codec support, and compatibility.
    When it matters: When you pair newer headphones and want a more stable, lower-power wireless connection.

    Importance: LOW

    Good value: >=5.0

    5.1
    Onyx Boox Note Air 4 C supports Bluetooth 5.1 which is newer than 88.1% of eReaders on this spec and equal to 7.6% of eReaders.
    Show more
    Weight
    What it is: The mass of the device, usually measured in grams.
    When it matters: When one-handed comfort matters and you do not want the reader to feel tiring during long sessions.

    Importance: HIGH

    Good value: <=200

    420 g
    Onyx Boox Note Air 4 C weighs 420 g which is heavier than 82% of eReaders on this spec and equal to 0.8% of eReaders.
    Thickness
    What it is: The depth of the body from front to back, usually measured in millimetres.
    When it matters: When grip comfort, sleeve fit, or how slim the reader feels in the hand matters to you.

    Importance: MEDIUM

    Good value: <=8

    5.8 mm
    Onyx Boox Note Air 4 C is 5.8 mm thick which is thinner than 91.7% of eReaders on this spec and equal to 5.8% of eReaders.
    Height
    What it is: The vertical size of the body, usually measured from top to bottom in millimetres.
    When it matters: When you are checking whether the reader will fit a bag, jacket pocket, or small stand.

    Importance: LOW

    Good value: <=160

    226 mm
    Onyx Boox Note Air 4 C is 226 mm tall which is taller than 79.5% of eReaders on this spec and equal to 2.5% of eReaders.
    Width
    What it is: The side-to-side body measurement, usually given in millimetres.
    When it matters: When one-handed reach and how much space the reader takes in a bag or bedside setup matter.

    Importance: LOW

    Good value: <=130

    193 mm
    Onyx Boox Note Air 4 C is 193 mm wide which is wider than 86.9% of eReaders on this spec and equal to 4.9% of eReaders.
    Water resistance (splashproof)
    What it is: Can tolerate light splashes, damp hands, or brief accidental contact with water.
    When it matters: When you read by the bath, at the pool, or outdoors where light moisture is realistic.

    Importance: MEDIUM

    no
    Onyx Boox Note Air 4 C does not have water resistance against splashes. 25% of eReaders have water resistance against splashes.
    Show more

    Onyx Boox Note Air 4 C vs the average eReader

    • 3.3 inches larger screen size
      Onyx Boox Note Air 4 C has a larger screen than the average eReader (10.3 inches vs 7 inches). The average eReader screen size is 7 inches.
      What it is: The diagonal measurement of the reading panel, usually given in inches.
      When it matters: When you are deciding between a small travel reader and a larger page that works better for PDFs, comics, or textbooks.

      Importance: HIGH

      Good value: >=7.8

      Onyx Boox Note Air 4 C has a larger screen than the average eReader (10.3 inches vs 7 inches). The average eReader screen size is 7 inches.10.3 inches vs 7 inches
    • 11 broader file support
      Onyx Boox Note Air 4 C supports a broader range of file types than the average eReader (26 vs 15).
      What it is: Lists which ebook, document, image, or audio formats the reader can open without conversion.
      When it matters: When your library comes from mixed sources instead of one locked bookstore.

      Importance: HIGH

      Onyx Boox Note Air 4 C supports a broader range of file types than the average eReader (26 vs 15).26 vs 15
    • 2.42x larger battery capacity
      Onyx Boox Note Air 4 C has a larger battery than the average eReader (3,700 mAh vs 1,530 mAh). The average eReader battery has a capacity of 1,530 mAh.
      What it is: The amount of energy the battery can store, commonly expressed in mAh.
      When it matters: When you want a rough hardware indicator of how much power reserve the device has.

      Importance: MEDIUM

      Good value: >=2000

      Onyx Boox Note Air 4 C has a larger battery than the average eReader (3,700 mAh vs 1,530 mAh). The average eReader battery has a capacity of 1,530 mAh.3,700 mAh vs 1,530 mAh
    • Higher screen resolution
      Onyx Boox Note Air 4 C supports higher screen resolution than the average eReader (1860x2480 px vs 1072x1448 px). The average eReader supports 1072x1448 px screen resolution.
      What it is: The total pixel grid shown on the panel, normally written as width by height.
      When it matters: When small fonts, diagrams, or dense page layouts need to stay readable without constant zooming.

      Importance: HIGH

      Onyx Boox Note Air 4 C supports higher screen resolution than the average eReader (1860x2480 px vs 1072x1448 px). The average eReader supports 1072x1448 px screen resolution.1860x2480 px vs 1072x1448 px
    • 4x more storage
      Onyx Boox Note Air 4 C offers more internal storage than the average eReader (64 GB vs 16 GB). The average eReader provides 16 GB of internal storage.
      What it is: The built-in space available for books, notes, audiobooks, apps, and downloaded documents.
      When it matters: When you keep large libraries offline or store a lot of PDFs and audio locally.

      Importance: HIGH

      Good value: >=32

      Onyx Boox Note Air 4 C offers more internal storage than the average eReader (64 GB vs 16 GB). The average eReader provides 16 GB of internal storage.64 GB vs 16 GB
    • 5.49 GB more RAM
      Onyx Boox Note Air 4 C has more RAM than the average eReader (6 GB vs 0.512 GB). The average eReader has 0.512 GB of RAM.
      What it is: The amount of working memory used for page rendering, multitasking, and keeping content active in the background.
      When it matters: When you open heavy files, switch between books, or expect the interface to stay snappy.

      Importance: MEDIUM

      Good value: >=2

      Onyx Boox Note Air 4 C has more RAM than the average eReader (6 GB vs 0.512 GB). The average eReader has 0.512 GB of RAM.6 GB vs 0.512 GB
    • Has color display
      Onyx Boox Note Air 4 C has a color display, while the average eReader does not.
      What it is: Shows color instead of grayscale only, usually through a color E Ink panel with more muted tones than LCD or OLED screens.
      When it matters: When you read comics, illustrated books, magazines, or documents that rely on color-coded charts and highlights.

      Importance: MEDIUM

      Onyx Boox Note Air 4 C has a color display, while the average eReader does not.
    • Supports handwriting recognition
      Onyx Boox Note Air 4 C supports handwriting recognition, while the average eReader does not.
      Built-in handwriting-to-text support.
      What it is: Can convert handwritten pen input into editable digital text.
      When it matters: When you write notes by hand and want them searchable, cleaner, or easier to export later.

      Importance: MEDIUM

      Onyx Boox Note Air 4 C supports handwriting recognition, while the average eReader does not.
    • 3.3 inches larger screen size
      Onyx Boox Note Air 4 C has a larger screen than the average eReader (10.3 inches vs 7 inches). The average eReader screen size is 7 inches.
    • Higher screen resolution
      Onyx Boox Note Air 4 C supports higher screen resolution than the average eReader (1860x2480 px vs 1072x1448 px). The average eReader supports 1072x1448 px screen resolution.
    • Has color display
      Onyx Boox Note Air 4 C has a color display, while the average eReader does not.
    • More advanced E-Ink technology
      Onyx Boox Note Air 4 C uses Kaleido 3 E-Ink technology, while the average eReader uses Carta Plus.
    • 13.2% higher pixel density
      Onyx Boox Note Air 4 C has a higher pixel density than the average eReader (300 ppi vs 265 ppi). The average eReader has a pixel density of 265 ppi.
    • Has auto-brightness sensor
      Onyx Boox Note Air 4 C has an auto-brightness sensor, while the average eReader does not.
    • Supports auto-rotate
      Onyx Boox Note Air 4 C supports auto-rotate, while the average eReader does not.
    • 11 broader file support
      Onyx Boox Note Air 4 C supports a broader range of file types than the average eReader (26 vs 15).
    • Supports handwriting recognition
      Onyx Boox Note Air 4 C supports handwriting recognition, while the average eReader does not.
    • Supports stylus
      Onyx Boox Note Air 4 C supports a stylus, while the average eReader does not.
    • Broader library support
      Onyx Boox Note Air 4 C supports more library lending platforms than the average eReader (OverDrive, Libby, Hoopla, BorrowBox, cloudLibrary vs OverDrive, Libby).
    • Includes stylus
      Onyx Boox Note Air 4 C includes a stylus, while the average eReader does not.
    • 2.42x larger battery capacity
      Onyx Boox Note Air 4 C has a larger battery than the average eReader (3,700 mAh vs 1,530 mAh). The average eReader battery has a capacity of 1,530 mAh.
    • 4x more storage
      Onyx Boox Note Air 4 C offers more internal storage than the average eReader (64 GB vs 16 GB). The average eReader provides 16 GB of internal storage.
    • 5.49 GB more RAM
      Onyx Boox Note Air 4 C has more RAM than the average eReader (6 GB vs 0.512 GB). The average eReader has 0.512 GB of RAM.
    • Includes memory card slot
      Onyx Boox Note Air 4 C includes a memory card slot, while the average eReader does not.
    • Faster CPU base clock speed
      Onyx Boox Note Air 4 C has a faster CPU base clock speed than the average eReader (8x2 GHz vs 1x1 GHz). The average eReader has a CPU base clock speed of 1x1 GHz.
    • Has accelerometer
      Onyx Boox Note Air 4 C has an accelerometer, while the average eReader does not.
    • More advanced operating system
      Onyx Boox Note Air 4 C uses Android 13, a more advanced operating system than Kindle OS on the average eReader.
    • Has fingerprint scanner
      Onyx Boox Note Air 4 C has a fingerprint scanner, while the average eReader does not.
    • Has microphone
      Onyx Boox Note Air 4 C has a microphone, while the average eReader does not.
    • Supports USB OTG
      Onyx Boox Note Air 4 C supports USB OTG, while the average eReader does not.
    • 2 more speakers
      Onyx Boox Note Air 4 C has more speakers than the average eReader (2 vs 0). The average eReader has 0 speakers.
    • Better Wi-Fi bands
      Onyx Boox Note Air 4 C supports 2.4 GHz+5 GHz Wi-Fi bands, while the average eReader supports 2.4 GHz.
    • 2.3 mm thinner
      Onyx Boox Note Air 4 C is thinner than the average eReader (5.8 mm vs 8.1 mm). The average eReader thickness is 8.1 mm.
    • 3 year/s newer release date
      Onyx Boox Note Air 4 C is newer than the average eReader (2024 vs 2021). The average eReader was released in 2021.

    Total
    Overall
    Display
    Reading
    Battery
    Hardware
    Connectivity
    Design
    • 97.2% heavier
      Onyx Boox Note Air 4 C is heavier than the average eReader (420 g vs 213 g). The average eReader weighs 213 g.
    • 65.4 mm wider
      Onyx Boox Note Air 4 C is wider than the average eReader (193 mm vs 127.6 mm). The average eReader width is 127.6 mm.
    • 53 mm taller
      Onyx Boox Note Air 4 C is taller than the average eReader (226 mm vs 173 mm). The average eReader height is 173 mm.
    • 97.2% heavier
      Onyx Boox Note Air 4 C is heavier than the average eReader (420 g vs 213 g). The average eReader weighs 213 g.
      What it is: The mass of the device, usually measured in grams.
      When it matters: When one-handed comfort matters and you do not want the reader to feel tiring during long sessions.

      Importance: HIGH

      Good value: <=200

      Onyx Boox Note Air 4 C is heavier than the average eReader (420 g vs 213 g). The average eReader weighs 213 g.420 g vs 213 g
    • 65.4 mm wider
      Onyx Boox Note Air 4 C is wider than the average eReader (193 mm vs 127.6 mm). The average eReader width is 127.6 mm.
      What it is: The side-to-side body measurement, usually given in millimetres.
      When it matters: When one-handed reach and how much space the reader takes in a bag or bedside setup matter.

      Importance: LOW

      Good value: <=130

      Onyx Boox Note Air 4 C is wider than the average eReader (193 mm vs 127.6 mm). The average eReader width is 127.6 mm.193 mm vs 127.6 mm
    • 53 mm taller
      Onyx Boox Note Air 4 C is taller than the average eReader (226 mm vs 173 mm). The average eReader height is 173 mm.
      What it is: The vertical size of the body, usually measured from top to bottom in millimetres.
      When it matters: When you are checking whether the reader will fit a bag, jacket pocket, or small stand.

      Importance: LOW

      Good value: <=160

      Onyx Boox Note Air 4 C is taller than the average eReader (226 mm vs 173 mm). The average eReader height is 173 mm.226 mm vs 173 mm
    • 2.82x more expensive
      Onyx Boox Note Air 4 C is more expensive than the average eReader (£480 vs £170).
      Onyx Boox Note Air 4 C is more expensive than the average eReader (£480 vs £170).£480 vs £170
    Total
    Overall
    Design

    Graphic comparison of Onyx Boox Note Air 4 C and other eReaders

    Attribute category
    Attribute
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    Third-party reviews

    United Kingdom
    amazon
    4.1
    340 Reviews
    amazon
    4.2
    213 Reviews
    amazon
    4.1
    140 Reviews
    amazon
    3.9
    47 Reviews
    amazon
    5.0
    1 Reviews
    United States
    Amazon_logo.png
    4.2
    227 Reviews
    Amazon_logo.png
    4.2
    143 Reviews

    (Reviews last updated: Apr 2026)

    What customers like about Onyx Boox Note Air 4 C?

    • Versatile Android 13 ecosystem with full Google Play Store access
    • Excellent paper-like writing and sketching experience with the included stylus
    • Improved performance and snappier multitasking due to 6GB RAM and updated octa-core CPU
    • Vibrant 10.3-inch Kaleido 3 color E Ink display, ideal for comics and graphic novels
    • Highly flexible screen refresh settings (BSR technology) to reduce ghosting
    • Premium, slim aluminum build with a built-in fingerprint sensor for security
    • Expandable storage via a microSD card slot supporting up to 2TB

    What customers dislike about Onyx Boox Note Air 4 C?

    • Noticeably darker screen compared to monochrome devices, often requiring the frontlight even in well-lit rooms
    • Significantly shorter battery life than standard e-readers when using color modes and BSR (lasts days rather than weeks)
    • Muted and less vibrant colors compared to traditional LCD or OLED tablet screens
    • Higher price point compared to similar monochrome e-ink tablets
    • Weak built-in speakers with poor bass and no physical volume buttons
    • Substantial learning curve due to the complexity of the highly customizable Android software
    • Screen-door effect is visible up close due to the Kaleido 3 color layer

    Expert reviews

    X
    xda-developers.com
    30/04/2025
    Boox Note Air 4C review: It's like an Android tablet combined with a Kindle Would you like a comparison of how this model’s battery life or screen bri...

    The Onyx Boox Note Air 4C is praised by XDA-Developers as a versatile 10.3-inch device bridging the gap between an e-reader and an Android tablet, featuring a 420g design, fingerprint sensor, and a Kaleido 3 color e-ink display suitable for comics. Key pros include an open Android 13 ecosystem with full Google Play Store access, allowing third-party apps, alongside impressive...Read more

    C
    cnet.com
    02/03/2025
    Boox Note Air4 C Review: A Colorful Blend of E-Ink Tablet and E-Reader

    The Onyx Boox Note Air4 C is a 10.3-inch E Ink tablet featuring a Kaleido 3 color display and Android 13, offering a versatile blend of e-reader functionality and app support. Key advantages include an excellent, lag-free stylus experience, customizable refresh modes, and long-lasting battery life. While offering improved color over monochrome, the display remains muted and...Read more

    A
    androidcentral.com
    31/01/2025
    Onyx Boox Note Air 4 C review: This e-reader is thinner than a phone

    The Onyx Boox Note Air 4 C is a premium 10.3-inch color E-Ink tablet featuring an upgraded Kaleido 3 display (300 PPI black-and-white, 150 PPI color) and a faster processor with 6GB of RAM, making it a robust, versatile device that bridges the gap between e-readers and Android tablets. A major strength is its Android 13 OS with full Play Store access, paired with excellent...Read more

    T
    the-gadgeteer.com
    06/08/2025
    Boox Note Air4 C review - A real E-ink tablet for die-hard note takers

    The Boox Note Air4 C is a 10.3-inch color E-ink tablet running Android 13, featuring Kaleido 3 technology for 300 PPI black-and-white text and muted colors, offering a premium "pencil on paper" writing experience with its Wacom-powered stylus. Key pros include the responsive stylus, expandable storage, and App Store access for apps like Kindle, while a major con is the dimmed screen...Read more

    P
    pocket-lint.com
    10/12/2024
    Boox Note Air4 C review: Only subtle upgrades

    The Onyx Boox Note Air4 C is a highly capable 10.3-inch E Ink tablet featuring a Kaleido 3 color screen, Android 13, and a premium design with a microSD slot, acting as a versatile digital notebook. Its standout pros include an excellent paper-like writing experience, a responsive stylus with no lag, and a new user interface with enhanced multitasking tools. The device provides full...Read more

    E
    ewritable.net
    31/10/2025
    Boox Note Air4 C Review - eWritable

    The Boox Note Air4 C is a premium 10.3-inch color e-ink tablet featuring a robust metallic build, Android 13, and a textured screen for a tactile writing experience. It boasts a Kaleido 3 display with 300 PPI (B&W) and 150 PPI (color), along with a bright frontlight and "Boox Super Refresh" technology for smooth performance. Key pros include high-end features like a 2TB-capable...Read more

    P
    pcmag.com
    21/07/2025
    Onyx Boox Note Air 4 C Review: The Best Color E Ink Tablet for Most People

    The Onyx Boox Note Air 4 C is a versatile 10.3-inch color E Ink tablet featuring a Kaleido 3 display (300ppi monochrome, 150ppi color), 6GB of RAM, and Android 13, earning it an Editors' Choice award. The device excels in note-taking with a paper-like feel, offers extensive app compatibility via the Google Play Store, and includes a microSD card slot for expanded storage. However,...Read more

    U
    uk.pcmag.com
    21/07/2025
    Onyx Boox Note Air 4 C - Review 2025 - PCMag UK

    The Onyx Boox Note Air 4 C is a premium 10.3-inch color E Ink tablet running Android 13, featuring a Kaleido 3 display (300 ppi B&W, 150 ppi color) and an open ecosystem for app downloads. It boasts strong performance with 6GB RAM, excellent build quality with a fingerprint sensor, and a natural writing experience with the included stylus. However, cons include a high price point,...Read more

    L
    lifehacker.com
    17/03/2025
    Review: The Boox Note Air 4C Is a Color E-Reader and Digital Notebook in One

    The Onyx Boox Note Air 4C is a versatile 10.3-inch color e-ink tablet featuring an open Android 13 ecosystem, allowing for extensive app installation via the Google Play Store. Its premium design includes a metal-backed build and a microSD card slot for storage expansion, though the 150 PPI color screen provides more muted, "pastel-like" colors compared to traditional tablets. The...Read more

    M
    me.pcmag.com
    20/11/2024
    Onyx Boox Note Air 4c Review - PCMag Middle East

    The Onyx Boox Note Air 4 C is a 10.3-inch color E Ink tablet featuring a durable aluminum frame, upgraded octa-core processor, and 6GB of RAM, earning an Editors' Choice award for its premium performance. Running Android 13, it offers exceptional versatility through Google Play Store access, supporting extensive document formats, handwriting with a paper-like feel, and expandable...Read more

    M
    maclife.de
    18/11/2025
    Boox Note Air4 C Review: A Different Kind of Tablet

    The Boox Note Air4 C is a 10.3-inch E Ink tablet featuring a Kaleido 3 display with 300 dpi for black-and-white and 150 dpi for color, operating on an open Android 13 system with full Google Play Store access. Key advantages include its versatility in handling apps like Kindle and OneNote, alongside excellent note-taking capabilities and a premium, comfortable writing experience....Read more

    (Translated)Show original
    L
    lesnumeriques.com
    16/12/2024
    Boox Note Air4 C Review: A high-end hybrid between an e-reader and a tablet

    The Boox Note Air4 C is a premium 10.3-inch color e-ink tablet featuring a slim aluminum-magnesium design and a Kaleido 3 display (300 PPI B&W, 150 PPI color), powered by Android 13. It boasts an 8-core processor, 6GB RAM, and "Boox Super Refresh" technology for reduced ghosting, making it highly versatile for app usage. Key strengths include a natural, low-latency writing...Read more

    (Translated)Show original
    N
    notebookcheck.biz
    Décembre 2025
    Boox Note Air4 C Review: Color E-Reader with Google Play Store and Stylus

    The Boox Note Air4 C is a 10.3-inch color E Ink tablet featuring an upgraded processor, 6GB of RAM, and Android 13 with full Google Play Store access. It utilizes a Kaleido 3 display with 300 PPI for black-and-white and 150 PPI for color, offering a premium 5.8 mm thick aluminium-magnesium alloy design. Key advantages include the versatile Android ecosystem, excellent, low-latency...Read more

    (Translated)Show original
    Z
    zdnet.fr
    20 novembre 2024
    Boox Note Air4 C Review: This color ePaper tablet does more for less

    The Onyx Boox Note Air4 C is a 10.3-inch color ePaper tablet offering improved performance through an upgraded processor and 6GB of RAM, housed in a premium aluminum chassis. It features Android 13 with full Google Play Store access, allowing for flexible app installation, alongside BSR technology that significantly reduces screen ghosting. Key advantages include its versatility for...Read more

    (Translated)Show original
    V
    virtuabarcelona.com
    12/07/2025
    BOOX Note Air4 C Review: The Best ePaper Tablet for Professionals and Students

    The Onyx Boox Note Air 4 C is a 10.3-inch color E Ink tablet featuring Android 13, 6GB of RAM, and a Kaleido 3 display designed for professional note-taking and document annotation. Its premium aluminum design, extensive software customization, and inclusion of a microSD card slot for expanded storage are key advantages. However, users may find the screen dark without the...Read more

    (Translated)Show original
    G
    gamereactor.es
    09/08/2025
    BOOX Note Air4 C Tablet Review

    The Onyx Boox Note Air4 C is a 10.3-inch E Ink tablet featuring a Kaleido 3 color display and Android 13, offering a versatile, eye-friendly tool for professionals that allows app access via the Google Play Store. The device delivers a superior, natural writing experience with its Wacom-powered stylus and utilizes Boox Super Refresh (BSR) technology for faster screen updates across...Read more

    (Translated)Show original
    2
    20minutos.es
    05/02/2025
    My experience with the BOOX Note Air4 C: here are the pros and cons

    The BOOX Go Color 7 is a versatile 7-inch e-reader featuring Android 13, physical page-turn buttons, and a Kaleido 3 color screen that offers 300 PPI for text and 150 PPI for color, making it ideal for comics and graphic novels. Key advantages include the ability to install third-party apps via the Google Play Store and a comfortable, compact design. However, the color display is...Read more

    (Translated)Show original
    L
    larazon.es
    26/12/2024
    BOOX Note Air4 C Review: An e-reader-souled tablet for enjoying manga and comics

    The BOOX Note Air4 C is a 10.3-inch Kaleido 3 e-ink tablet that functions as a hybrid e-reader and productive Android 13 device, featuring a premium aluminum build and improved performance with 6GB of RAM. It offers a superior, eye-friendly experience for reading manga and comics, enhanced by Boox Super Refresh (BSR) technology to minimize ghosting. Pros include a responsive,...Read more

    (Translated)Show original
    M
    multiplayer.it
    13/08/2025
    Boox Note Air 4 C review: The color E-ink tablet powered by Android

    The Boox Note Air 4 C is a 10.3-inch color E-Ink tablet featuring an upgraded Android 13 system, 6GB of RAM, and a slim aluminum-magnesium build, incorporating a 300 PPI Kaleido 3 display (150 PPI color) with Boox Super Refresh (BSR) technology. Key advantages include extensive versatility via the Google Play Store, a paper-like, low-latency writing experience, and exceptional...Read more

    (Translated)Show original
    H
    hwupgrade.it
    08/08/2025
    BOOX Note Air4 C is a Marvel: The Android E-Ink Tablet for Reading and Writing

    The HWUpgrade review highlights the Onyx Boox Note Air4 C as a premium 10.3-inch E Ink tablet, praising its Kaleido 3 display, snappy Qualcomm processor with 6GB RAM, and full Android 13 functionality. Users benefit from a natural, paper-like writing experience, fast performance, and an improved build with an aluminum frame and fingerprint sensor. Key disadvantages include muted...Read more

    (Translated)Show original
    H
    hackerjournal.it
    10 Febbraio 2026
    BOOX Note Air4 C Review: A Colorful Blend of E-Ink Tablet and E-Reader

    The Onyx Boox Note Air4 C is a versatile 10.3-inch E Ink tablet featuring Android 13 and Google Play Store access, providing a smooth, tablet-like experience with 6GB of RAM. It excels in note-taking with a high-responsiveness Wacom stylus, paper-like screen feel, and productive software tools like split-screen mode and the BooxDrop file transfer system. However, notable drawbacks...Read more

    (Translated)Show original
    T
    tech.everyeye.it
    04 Agosto 2025
    Boox Note Air 4C Review: Color E-Ink Technology and Ultimate Customization

    The Boox Note Air 4C is described as a versatile 10.3-inch E-Ink tablet that merges e-reader functionality with a productive Android 13 environment. Featuring a Kaleido 3 display (300 PPI B&W, 150 PPI color), the device excels at viewing charts and technical documents, offering 4,096 muted colors. Pros include an open system with full Google Play Store access, powerful performance...Read more

    (Translated)Show original
    W
    wired.it
    02/01/2025
    Boox Note Air4 C: the e-reader that lets you write too

    The Boox Note Air4 C is a versatile 10.3-inch color E Ink tablet featuring an upgraded Kaleido 3 display (300 PPI B&W, 150 PPI color) and Android 13 with Google Play Store access. It offers a natural, lag-free writing experience with a Wacom stylus, 6GB of RAM, and supports extensive file formats and multitasking, along with a rare microSD card slot for expanded storage. While...Read more

    (Translated)Show original
    A
    andreagaleazzi.com
    12/02/2025
    E-INK TABLET COMPARISON: reMarkable Paper Pro vs. Boox Note Air4 C vs. Kindle Scribe (2024)

    Andrea Galeazzi's review highlights the Onyx Boox Note Air4 C as the most versatile "all-in-one" device due to its open Android OS, Google Play Store access, and highly customizable interface, though it features a steeper learning curve and a potentially dimmer screen. The reMarkable Paper Pro excels in writing experience, offering premium build quality, a large color display, and...Read more

    (Translated)Show original
    N
    notebookcheck.nl
    01/12/2025
    Boox Note Air4 C in a brief test

    The Boox Note Air4 C is a versatile 10.3-inch E-ink tablet running Android 13 with full Google Play Store access, offering superior app flexibility compared to locked-down e-readers. It features a Kaleido 3 color display and a "paper-like" writing experience with the included Pen Plus stylus. Pros include a sturdy aluminum build, expandable storage via microSD (up to 2TB), and a...Read more

    (Translated)Show original

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