OVERALL
ALTERNATIVES
SPECS
VS AVERAGE
REVIEWS
Scored using eReaders Methodology v1.0
eReaders Methodology v1.0
Mathematical & Unbiased Scoring
Products in this category are evaluated mathematically under Frontumo eReaders Methodology v1.0 using verified laboratory benchmarks, technical specifications, and authentic consumer ratings with 0% commercial bias.
Explore eReaders Methodology v1.0

Onyx Boox Tab Ultra C Review | 68 Data compared

Avg. price:~£570Screen size:10.3 inchesPixel density:300 ppiInternal storage:128 GBBattery life:20 hoursSupported bookstore ecosystem:Android Open Ecosystem

Onyx Boox Tab Ultra C Review: Compare 68 technical specifications and user reviews to see how this product ranks in the eReaders category and whether it is worth buying.

8.2

Overall score

Score
8.2/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
★ Better than 98% of models
Score components

90%

8.4

Technical score

10%

7.1

User score

★Better than 98% of ereaders
8.4

Technical score

Technical score
8.4/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
★ Better than 97% of models
Score components

25%

9.7

Display

22%

9.4

Reading

18%

6.7

Battery

14%

9.6

Hardware

12%

8.7

Connectivity

9%

3.0

Design

★Better than 97% of ereaders
7.1

User score

User score
7.1/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 80% of models
Score components

70%

7.6

User ratings

30%

6.1

Number of reviews

Based on 432 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
â–¼Worse than 80% of ereaders
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Best prices

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Best rankings

Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.
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Technical Specifications of eReader Onyx Boox Tab Ultra C

Technical score
Technical score
8.4/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
★ Better than 97% of models
Score components:

25%

9.7

Display

22%

9.4

Reading

18%

6.7

Battery

14%

9.6

Hardware

12%

8.7

Connectivity

9%

3.0

Design

8.4
User score
User score
7.1/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 80% of models
Score components

70%

7.6

User ratings

30%

6.1

Number of reviews

Based on 432 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
7.1
Popularity
Popularity
6.1/ 10
✕
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.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 62% of models
Popularity:
Onyx Boox Tab Ultra C has a popularity score of 6.1 points, which is higher than that of 62.3% of products in this category.
6.1
Value for money
Value for money
8.0/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–² Better than 73% of models
Score components:

60%

8.2

Overall score

40%

7.5

Price

8.0
Brand name
Onyx
Screen size
10.3 inches
Screen size
10.3 inches
â–² Better than 87% of models
Market range: <5 inches – >10 inches
This ereader has a screen size of 10.3 inches which is larger than 86.9% on this spec and equal to 11.5% of eReaders.
Screen resolution
1860x2480 px
Screen resolution
1860x2480 px
★ Better than 95% of models
This ereader 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
300 ppi
Pixel density
300 ppi
â–² Better than 52% of models
Market range: <150 ppi – >300 ppi
This ereader has a pixel density of 300 ppi which is higher than 51.6% on this spec and equal to 48.4% of eReaders.
150 ppi in color.
E-paper display
yes
E-paper display
yes
â–² Better than 2% of models
This ereader uses an e-paper display. 2.5% of eReaders have an e-paper display.
Show more
Supported file types
24
Supported file types
24
â–² Better than 86% of models
Market range: <9 – >24
This ereader supports 24 file types which is more than 85.6% on this spec and equal to 5.1% of eReaders.
PDF reflow support
yes
PDF reflow support
yes
â–² Better than 45% of models
This ereader offers PDF reflow. 45.5% of eReaders support PDF reflow.
Annotation support
yes
Annotation support
yes
â–² Better than 2% of models
This ereader offers annotation support. 1.6% of eReaders offer annotation support.
Dictionary
yes
Dictionary
yes
â–² Better than 1% of models
This ereader includes a built-in dictionary. 0.8% of eReaders include a built-in dictionary.
Text-to-speech
yes
Text-to-speech
yes
â–² Better than 36% of models
This ereader offers text-to-speech. 36.1% of eReaders include text-to-speech.
Show more
Battery life
20 hours
Battery life
20 hours
â–¼ Worse than 52% of models
Market range: <12 hours – >42 hours
This ereader offers 20 hours of battery life which is shorter than 52.1% on this spec and equal to 10.4% of eReaders.
highly variable, around 14h with 100% frontlight, but can last multiple days with typical usage
Battery capacity
6,300 mAh
Battery capacity
6,300 mAh
★ Better than 98% of models
Market range: <1k mAh – >4k mAh
This ereader has a battery capacity of 6,300 mAh which is higher than 98.4% on this spec and equal to 1.7% of eReaders.
Charging time
2 hours
Charging time
2 hours
â–² Better than 49% of models
Market range: <1 hours – >6 hours
This ereader takes 2 hours to charge which is quicker than 49.1% on this spec and equal to 40% of eReaders.
Varies depending on charger used; reports range from around 2 hours with fast charging to over 4.5 hours with a 9W adapter
Wireless charging
no
Wireless charging
no
â–¼ Worse than 7% of models
This ereader does not offer wireless charging. 7.4% of eReaders offer wireless charging.
Internal storage
128 GB
Internal storage
128 GB
★ Better than 94% of models
Market range: <2 GB – >62 GB
This ereader offers 128 GB of internal storage which is more than 94.3% on this spec and equal to 5.7% of eReaders.
RAM capacity
4 GB
RAM capacity
4 GB
â–² Better than 87% of models
Market range: <0 GB – >5 GB
This ereader offers 4 GB of RAM which is more than 86.9% on this spec and equal to 9.8% of eReaders.
CPU base clock speed
8x 2 GHz
CPU base clock speed
8x 2 GHz
â–² Better than 83% of models
This ereader has a CPU base clock speed of 8x2 GHz, which is faster than that of 82.6% of eReaders and the same as that of 12.4% of eReaders.
Operating system
Android 11
Operating system
Android 11
â–² Better than 76% of models
This ereader runs Android 11, which is more advanced than that of 76.2% of eReaders and the same as that of 17.2% of eReaders.
Memory card slot
yes
Memory card slot
yes
â–² Better than 57% of models
This ereader has a memory card slot. 57.4% of eReaders have a memory card slot.
Show more
Wi-Fi connectivity
yes
Wi-Fi connectivity
yes
â–² Better than 7% of models
This ereader connects over Wi-Fi. 6.6% of eReaders have Wi-Fi.
Wi-Fi version
Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n)
Wi-Fi version
Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n)
â–² Better than 58% of models
This ereader 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
2.4 GHz+5 GHz
Wi-Fi bands supported
2.4 GHz+5 GHz
â–² Better than 57% of models
This ereader 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
yes
Bluetooth
yes
â–² Better than 40% of models
This ereader connects over Bluetooth. 40.2% of eReaders have Bluetooth.
Bluetooth version
5
Bluetooth version
5
â–² Better than 58% of models
Market range: <1 – >6
This ereader supports Bluetooth 5 which is newer than 58.3% on this spec and equal to 29.2% of eReaders.
Show more
Weight
480 g
Weight
480 g
â–¼ Worse than 90% of models
Market range: <160 g – >480 g
This ereader weighs 480 g which is heavier than 90.2% on this spec and equal to 0.8% of eReaders.
Thickness
6.7 mm
Thickness
6.7 mm
â–² Better than 83% of models
Market range: <6 mm – >11 mm
This ereader is 6.7 mm thick which is thinner than 82.6% on this spec and equal to 0.8% of eReaders.
Height
225 mm
Height
225 mm
â–¼ Worse than 77% of models
Market range: <150 mm – >240 mm
This ereader is 225 mm tall which is taller than 77.1% on this spec and equal to 0.8% of eReaders.
Width
184.5 mm
Width
184.5 mm
â–¼ Worse than 84% of models
Market range: <100 mm – >200 mm
This ereader is 184.5 mm wide which is wider than 84.4% on this spec and equal to 0.8% of eReaders.
Water resistance (splashproof)
no
Water resistance (splashproof)
no
â–¼ Worse than 25% of models
This ereader does not have water resistance against splashes. 25% of eReaders have water resistance against splashes.
Show more

Onyx Boox Tab Ultra C vs the average eReader

246810TotalDisplayReadingBatteryHardwareConnectivityDesign
  • 4.03x larger battery capacity
    Battery capacity
    6,300 mAh
    ★ Better than 98% of models
    Market range: <1k mAh – >4k mAh
    This ereader has a larger battery than the average eReader (6300 mAh vs 1565 mAh). The average eReader battery has a capacity of 1565 mAh.
    6,300 mAh vs 1,565 mAh
  • 3.3 inches larger screen size
    Screen size
    10.3 inches
    â–² Better than 87% of models
    Market range: <5 inches – >10 inches
    This ereader 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
  • 8x more storage
    Internal storage
    128 GB
    ★ Better than 94% of models
    Market range: <2 GB – >62 GB
    This ereader offers more internal storage than the average eReader (128 GB vs 16 GB). The average eReader provides 16 GB of internal storage.
    128 GB vs 16 GB
  • Higher screen resolution
    Screen resolution
    1860x2480 px
    ★ Better than 95% of models
    This ereader 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
  • 9 more supported file formats
    Supported file types
    24
    â–² Better than 86% of models
    Market range: <9 – >24
    This ereader supports a broader range of file types than the average eReader (24 vs 15).
    24 vs 15
  • Color display
    Color display
    yes
    â–² Better than 87% of models
    This ereader has a color display, while the average eReader does not. 13.8% of eReaders have a color display.
  • Supports handwriting recognition
    Handwriting recognition
    yes
    â–² Better than 77% of models
    This ereader supports handwriting recognition, while the average eReader does not. 23.6% of eReaders support handwriting recognition.
    Built-in handwriting-to-text support.
  • 3.49 GB more RAM
    RAM capacity
    4 GB
    â–² Better than 87% of models
    Market range: <0 GB – >5 GB
    This ereader has more RAM than the average eReader (4 GB vs 0.5 GB). The average eReader has 0.512 GB of RAM.
    4 GB vs 0.512 GB
  • 3.3 inches larger screen size
    Screen size
    10.3 inches
    â–² Better than 87% of models
    Market range: <5 inches – >10 inches
    This ereader 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
  • Higher screen resolution
    Screen resolution
    1860x2480 px
    ★ Better than 95% of models
    This ereader 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
  • Color display
    Color display
    yes
    â–² Better than 87% of models
    This ereader has a color display, while the average eReader does not. 13.8% of eReaders have a color display.
  • More advanced E-Ink technology
    E-Ink technology
    Kaleido 3
    â–² Better than 85% of models
    This ereader uses Kaleido 3 E-Ink technology, while the average eReader uses Carta Plus.
    Kaleido 3 E Ink's color filter technology
    Kaleido 3 vs Carta Plus
  • 13.2% higher pixel density
    Pixel density
    300 ppi
    â–² Better than 52% of models
    Market range: <150 ppi – >300 ppi
    This ereader has a higher pixel density than the average eReader (300 ppi vs 265 ppi). The average eReader has a pixel density of 265 ppi.
    150 ppi in color.
    300 ppi vs 265 ppi
  • Supports auto-rotate
    Auto-rotate
    yes
    â–² Better than 57% of models
    This ereader supports auto-rotate, while the average eReader does not. 43.4% of eReaders support auto-rotate.
  • 9 more supported file formats
    Supported file types
    24
    â–² Better than 86% of models
    Market range: <9 – >24
    This ereader supports a broader range of file types than the average eReader (24 vs 15).
    24 vs 15
  • Supports handwriting recognition
    Handwriting recognition
    yes
    â–² Better than 77% of models
    This ereader supports handwriting recognition, while the average eReader does not. 23.6% of eReaders support handwriting recognition.
    Built-in handwriting-to-text support.
  • Supports stylus
    Stylus support
    yes
    â–² Better than 62% of models
    This ereader supports a stylus, while the average eReader does not. 38.2% of eReaders support a stylus.
    Wacom touch layer, 4,096 pressure levels
  • Broader library support
    Library lending platforms supported
    OverDrive, Libby, Hoopla, BorrowBox
    â–² Better than 80% of models
    This ereader supports more library lending platforms than the average eReader (OverDrive, Libby, Hoopla, BorrowBox vs OverDrive, Libby).
    OverDrive, Libby, Hoopla, BorrowBox vs OverDrive, Libby
  • Stylus included
    Stylus included
    yes
    â–² Better than 71% of models
    This ereader includes a stylus, while the average eReader does not. 29.3% of eReaders include a stylus.
    Pen2 Pro included.
  • 4.03x larger battery capacity
    Battery capacity
    6,300 mAh
    ★ Better than 98% of models
    Market range: <1k mAh – >4k mAh
    This ereader has a larger battery than the average eReader (6300 mAh vs 1565 mAh). The average eReader battery has a capacity of 1565 mAh.
    6,300 mAh vs 1,565 mAh
  • 8x more storage
    Internal storage
    128 GB
    ★ Better than 94% of models
    Market range: <2 GB – >62 GB
    This ereader offers more internal storage than the average eReader (128 GB vs 16 GB). The average eReader provides 16 GB of internal storage.
    128 GB vs 16 GB
  • 3.49 GB more RAM
    RAM capacity
    4 GB
    â–² Better than 87% of models
    Market range: <0 GB – >5 GB
    This ereader has more RAM than the average eReader (4 GB vs 0.5 GB). The average eReader has 0.512 GB of RAM.
    4 GB vs 0.512 GB
  • Memory card slot
    Memory card slot
    yes
    â–² Better than 57% of models
    This ereader includes a memory card slot, while the average eReader does not. 43.1% of eReaders include a memory card slot.
  • Faster CPU base clock speed
    CPU base clock speed
    8 x 2 GHz
    â–² Better than 83% of models
    This ereader 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.
    8x2 GHz vs 1x1 GHz
  • More advanced operating system
    Operating system
    Android 11
    â–² Better than 76% of models
    This ereader uses Android 11, a more advanced operating system than Kindle OS on the average eReader.
    Android 11 vs Kindle OS
  • Accelerometer included
    Accelerometer
    yes
    â–² Better than 55% of models
    This ereader has an accelerometer, while the average eReader does not. 45.1% of eReaders have an accelerometer.
  • Fingerprint scanner
    Fingerprint scanner
    yes
    ★ Better than 93% of models
    This ereader has a fingerprint scanner, while the average eReader does not. 8.1% of eReaders have a fingerprint scanner.
  • Microphone included
    Microphone
    yes
    â–² Better than 74% of models
    This ereader has a microphone, while the average eReader does not. 26.7% of eReaders have a microphone.
  • Supports USB OTG
    USB OTG support
    yes
    â–² Better than 67% of models
    This ereader supports USB OTG, while the average eReader does not. 33.9% of eReaders support USB OTG.
    OTG can connect USB drives or simple peripherals through the device port.
  • 2 more speakers
    Speakers
    2
    â–² Better than 79% of models
    Market range: <0 – >5
    This ereader has more speakers than the average eReader (2 vs 0). The average eReader has 0 speakers.
    Built-in speaker count reflects onboard audio hardware.
    2 vs 0
  • Better Wi-Fi bands
    Wi-Fi bands supported
    2.4 GHz+5 GHz
    â–² Better than 57% of models
    This ereader supports 2.4 GHz+5 GHz Wi-Fi bands, while the average eReader supports 2.4 GHz.
    2.4 GHz+5 GHz vs 2.4 GHz
  • Newer Wi-Fi version
    Wi-Fi version
    Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n)
    â–² Better than 58% of models
    This ereader supports a newer Wi-Fi version than the average eReader (Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n) vs Wi-Fi 4 (802.11n)).
    Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n) vs Wi-Fi 4 (802.11n)
  • 1.4 mm thinner
    Thickness
    6.7 mm
    â–² Better than 83% of models
    Market range: <6 mm – >11 mm
    This ereader is thinner than the average eReader (6.7 mm vs 8.1 mm). The average eReader thickness is 8.1 mm.
    6.7 mm vs 8.1 mm
  • 2 newer
    Release date
    2023
    â–² Better than 73% of models
    Market range: <2k – >2k
    This ereader is newer than the average eReader (2023 vs 2021). The average eReader was released in 2021.
    May 2023
    2,023 vs 2,021
  • Limited DRM support
    DRM schemes supported
    No native DRM support
    â–¼ Worse than 84% of models
    This ereader supports fewer DRM schemes than the average eReader (No native DRM support vs Adobe DRM, Social DRM).
    Relies on third-party Android apps for DRM-protected content.
    No native DRM support vs Adobe DRM, Social DRM
  • 2.25x heavier
    Weight
    480 g
    â–¼ Worse than 90% of models
    Market range: <160 g – >480 g
    This ereader is heavier than the average eReader (480 g vs 213 g). The average eReader weighs 213 g.
    480 g vs 213 g
  • 56.9 mm wider
    Width
    184.5 mm
    â–¼ Worse than 84% of models
    Market range: <100 mm – >200 mm
    This ereader is wider than the average eReader (184.5 mm vs 127.6 mm). The average eReader width is 127.6 mm.
    184.5 mm vs 127.6 mm
  • 3.35x more expensive
    Onyx Boox Tab Ultra C is more expensive than the average eReader (£570 vs £170).
    £570 vs £170
  • 52 mm taller
    Height
    225 mm
    â–¼ Worse than 77% of models
    Market range: <150 mm – >240 mm
    This ereader is taller than the average eReader (225 mm vs 173 mm). The average eReader height is 173 mm.
    225 mm vs 173 mm
  • 1 hours shorter battery life
    Battery life
    20 hours
    â–¼ Worse than 52% of models
    Market range: <12 hours – >42 hours
    This ereader offers shorter battery life than the average eReader (20 hours vs 21 hours). The average eReader offers 21 hours of battery life.
    highly variable, around 14h with 100% frontlight, but can last multiple days with typical usage
    20 hours vs 21 hours
  • 12.1% lower user score
    User score
    7.1/ 10
    ✕
    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 distribution
    ▼▼
    <55-66-77-88-99-10
    Onyx Boox Tab Ultra C
    the average eReader
    Onyx Boox Tab Ultra C has a lower user score than the average eReader (7.14 vs 8.000).
    7.14 vs 8
  • Versions older Bluetooth
    Bluetooth version
    5.0
    â–² Better than 58% of models
    Market range: <1 – >6
    This ereader supports an older Bluetooth version than the average eReader (5 vs 5.1).
    5.0 vs 5.1
  • 3.35x more expensive
    Onyx Boox Tab Ultra C is more expensive than the average eReader (£570 vs £170).
    £570 vs £170
  • 12.1% lower user score
    User score
    7.1/ 10
    ✕
    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 distribution
    ▼▼
    <55-66-77-88-99-10
    Onyx Boox Tab Ultra C
    the average eReader
    Onyx Boox Tab Ultra C has a lower user score than the average eReader (7.14 vs 8.000).
    7.14 vs 8
  • Limited DRM support
    DRM schemes supported
    No native DRM support
    â–¼ Worse than 84% of models
    This ereader supports fewer DRM schemes than the average eReader (No native DRM support vs Adobe DRM, Social DRM).
    Relies on third-party Android apps for DRM-protected content.
    No native DRM support vs Adobe DRM, Social DRM
  • 1 hours shorter battery life
    Battery life
    20 hours
    â–¼ Worse than 52% of models
    Market range: <12 hours – >42 hours
    This ereader offers shorter battery life than the average eReader (20 hours vs 21 hours). The average eReader offers 21 hours of battery life.
    highly variable, around 14h with 100% frontlight, but can last multiple days with typical usage
    20 hours vs 21 hours
  • Versions older Bluetooth
    Bluetooth version
    5.0
    â–² Better than 58% of models
    Market range: <1 – >6
    This ereader supports an older Bluetooth version than the average eReader (5 vs 5.1).
    5.0 vs 5.1
  • 2.25x heavier
    Weight
    480 g
    â–¼ Worse than 90% of models
    Market range: <160 g – >480 g
    This ereader is heavier than the average eReader (480 g vs 213 g). The average eReader weighs 213 g.
    480 g vs 213 g
  • 56.9 mm wider
    Width
    184.5 mm
    â–¼ Worse than 84% of models
    Market range: <100 mm – >200 mm
    This ereader is wider than the average eReader (184.5 mm vs 127.6 mm). The average eReader width is 127.6 mm.
    184.5 mm vs 127.6 mm
  • 52 mm taller
    Height
    225 mm
    â–¼ Worse than 77% of models
    Market range: <150 mm – >240 mm
    This ereader is taller than the average eReader (225 mm vs 173 mm). The average eReader height is 173 mm.
    225 mm vs 173 mm

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

8.0
Brandon Boswell
≈ estimated
03/09/2023
Long-term review · three months of daily use
Verdict
Onyx Boox Tab Ultra C is better than the models it replaces, but upgrade only if you really want colour.
9.0
Chalid Raqami
≈ estimated
05/07/2023
Hands-on review · build, screen, battery and apps
Verdict
Onyx Boox Tab Ultra C has some downsides but it is a strong E Ink tablet and a big step forward for the technology.
9.0
My Deep Guide
≈ estimated
04/07/2023
In-depth review · screen, reader, notebook and battery tests
Verdict
Onyx Boox Tab Ultra C is not perfect, but it is the best colour e-ink tablet for buyers who accept its trade-offs and don't need a simple reader.
9.0
MakeUseOf
≈ estimated
17/06/2023
Hands-on review · productivity, reading and battery tests
Verdict
Onyx Boox Tab Ultra C is the best 10.3-inch colour e-reader available, especially for productivity, though not for everyone.
9.0
Kit Betts-Masters
≈ estimated
11/06/2023
Hands-on review · apps, reading, drawing and battery
Verdict
Onyx Boox Tab Ultra C is the best e-ink tablet for most people, though battery life and weight are real trade-offs.
7.0
The eBook Reader
≈ estimated
07/06/2023
Hands-on review · screen, apps and scanning
Verdict
Onyx Boox Tab Ultra C is decent for reading ebooks, with a versatile feature set, but refresh, ghosting and weight need work.
8.0
Tech Spurt
≈ estimated
01/06/2023
Unboxing and review · 24-hour use test
Verdict
Onyx Boox Tab Ultra C is enjoyable for comics and reading with the keyboard cover, though the high price and old Android may put buyers off.
8.0
AJWriting
≈ estimated
13/05/2023
Hands-on review · writing, keyboard and screen tests
Verdict
Onyx Boox Tab Ultra C is a niche device, worth it for heavy writers and editors despite the high price.
9.0
Marko
≈ estimated
10/05/2023
Unboxing and first impressions · days of sketching and note use
Verdict
Onyx Boox Tab Ultra C is built for creative work rather than media, with a satisfying pen and crisp screen.
7.0
Chalid Raqami
≈ estimated
08/05/2023
Live discussion · OneNote, pen, sync and design
Verdict
Onyx Boox Tab Ultra C is workable for note-taking, but OneNote pen handling and some design choices fall short.

Expert reviews

In-depth analysis and verdict from leading tech publications

pcmag.com
13/07/2023
Hands-on review · Color E Ink tablet
Verdict
The Onyx Boox Tab Ultra C is a strong color e-reader and note-taker, but its muted colors, ghosting and weight make it a poor stand-in for a tablet.
techradar.com
14/06/2023
Hands-on review · Color note-taking e-reader
Verdict
The Onyx Boox Tab Ultra C is a note-taking e-reader with a color screen that suits comics, but slow page turns and heavy ghosting hold it back.
t3.com
21/08/2023
Hands-on review · Color E Ink tablet
Verdict
The Onyx Boox Tab Ultra C suits readers who want color for comics and a backlight, though video stutters and third-party pen apps lag badly.
trustedreviews.com
06/10/2023
Hands-on review · Color E Ink e-reader
Verdict
The Onyx Boox Tab Ultra C suits colored e-books, comics and note-taking, but slow web and ghosting video mean it doesn't replace a tablet.
expertreviews.co.uk
23/06/2023
Hands-on review · Color E Ink notepad
Verdict
The Onyx Boox Tab Ultra C is a flexible color notepad with strong handwriting and Google Play access, but most Android apps are a poor fit for E Ink.
A
androidcentral.com
10/05/2023
Summary of the review
Onyx Boox Tab Ultra C review: The best E Ink tablet, now in color
U
uk.pcmag.com
13/07/2023
Summary of the review
Onyx Boox Tab Ultra C - Review 2023 - PCMag UK
androidpolice.com
12/06/2023
Review · Color E Ink tablet
Verdict
The Onyx Boox Tab Ultra C suits comics, notes and apps on a color E Ink screen, but it is a weaker choice for pure text reading.
B
blog.the-ebook-reader.com
06/06/2023
Summary of the review
Review: Boox Tab Ultra C with 10.3" Color E Ink Screen
H
howtogeek.com
01/06/2023
Summary of the review
Onyx BOOX Tab Ultra C Review: Tempting E-Paper Tablet With Shortcomings
makeuseof.com
16/06/2023
Review · Note-taking tablet
Verdict
The Onyx Boox Tab Ultra C is a long-lasting productivity tablet with strong scanned-PDF tools, though it gets no Android upgrades beyond Android 11.
C
creativebloq.com
12/06/2023
Summary of the review
Onyx Boox Tab Ultra C review: colour e-ink reader is also a tablet and laptop
L
liseuses.net
09/07/2023
Summary of the review
Onyx Boox Tab Ultra C
(Translated)Show original
M
minimachines.net
28/04/2023
Summary of the review
Onyx BOOX Tab Ultra C: a colour E Ink Android tablet
(Translated)Show original
Z
zdnet.fr
15/05/2023
Summary of the review
Onyx Boox Tab Ultra C Review: The Best E Ink Tablet Goes Color
(Translated)Show original
X
xataka.com
26/04/2023
Summary of the review
The Onyx Boox Tab Ultra C is an ebook reader in full colour
(Translated)Show original
smartworld.it
05/08/2023
Hands-on test · Color E Ink tablet
Verdict
The Onyx Boox Tab Ultra C is a flexible note-taking tablet with a sharp color E Ink screen, but its camera bump makes it wobble without a cover.
today.it
22/08/2023
Hands-on test · E Ink tablet
Verdict
The Onyx Boox Tab Ultra C suits study and work with fast software and a precise pen, but it is not built for videos or games.
T
techprincess.it
26/04/2023
Summary of the review
Onyx BOOX Tab Ultra C: E-Ink Tablet with Pastel Colors
(Translated)Show original
tuttotech.net
09/09/2023
Month-long test · E Ink tablet
Verdict
The Onyx Boox Tab Ultra C works well as a tablet, e-reader and notebook, with long battery life, though video and games are not its strength.

Third-party reviews

Based on 432 buyer reviews from online shops.
Reviews last updated: October 2026 · How we calculate this
Read buyer reviews on Amazon →

What we like about Onyx Boox Tab Ultra C

  • Versatile Kaleido 3 color E-Ink display that significantly enhances comics, magazines, and technical documents compared to grayscale models.
  • Full Android OS with Google Play Store support, allowing for a wide range of third-party apps like Kindle, Libby, and productivity tools.
  • Powerful hardware for an e-reader, including an octa-core processor and dedicated GPU (BSR technology) for smoother refreshing and less ghosting.
  • Excellent for note-taking and PDF annotation with the included low-latency Wacom stylus and robust first-party software.
  • Premium build quality with a sleek metal chassis and integrated fingerprint sensor for security.
  • Large 10.3-inch screen provides ample space for A5-sized documents and split-screen multitasking.

What we don't like about Onyx Boox Tab Ultra C

  • High price point compared to monochrome competitors like the Kindle Scribe or ReMarkable 2.
  • Color saturation and vibrancy are muted and 'pastel-like' compared to traditional LCD or OLED tablets.
  • Noticeably darker screen than monochrome E-Ink devices, often requiring the front light even in well-lit rooms.
  • Battery life is shorter than typical e-readers (lasting days rather than weeks) due to the higher power demands of the Android system and BSR tech.
  • The 16MP rear camera is often described as mediocre or 'superfluous' for anything other than basic document scanning.
  • Relatively heavy and dense at 480g-490g, making it less comfortable for extended one-handed reading.

Verdict

The Onyx Boox Tab Ultra C is a high-performance 10.3-inch color e-reader featuring an E Ink Kaleido 3 display that offers 300 ppi for black-and-white and 150 ppi for color content. Under the hood, it is powered by a Qualcomm octa-core processor paired with 4GB of RAM and 128GB of internal storage, expandable via a microSD slot up to 2TB. Main characteristics include a 16MP rear camera for document scanning, a 6,300mAh battery for extended use, and an Android 11 operating system that provides full access to the Google Play Store. Its primary pros are the eye-friendly color e-paper experience, a highly responsive Wacom layer for 4,096 levels of stylus pressure sensitivity, and a dedicated GPU for smoother page refreshes. However, users should note cons such as muted color vibrancy compared to traditional tablets, a relatively heavy 480g build that may hinder one-handed use, and the absence of a 3.5mm headphone jack or physical volume buttons.

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