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Onyx Boox Tab Ultra C Pro review – High-end tablet with color e-ink display and camera

For more than just reading. Of course, you can read books in color on the Onyx Boox Tab Ultra C Pro, but you can also do so much more than that: Thanks to pen input, you can draw or take notes, thanks to the Android system, you can run apps, and you can even take pictures. But there are also some limitations ...
Onyx Boox Tab Ultra C Pro
Onyx Boox Tab Ultra C Pro
Processor
Qualcomm Snapdragon 855 8 x 2.8 GHz, Cortex-A76 / A55 (Kryo 485)
Graphics adapter
Memory
6 GB 
Display
10.30 inch 4:3, 1240 x 930 pixel 150 PPI, capacitive touchscreen, native pen support, e-ink, 4096 color levels, 2480 x 1860 pixels in b/w mode, glossy: no
Storage
128 GB UFS 3.1 Flash, 128 GB 
, 108 GB free
Connections
1 USB 2.0, USB-C Power Delivery (PD), 1 Docking Station Port, Audio Connections: audio via , Card Reader: microSDHC (up to 2 TB, dedicated), 1 Fingerprint Reader
Networking
802.11 a/b/g/n/ac (a/b/g/n = Wi-Fi 4/ac = Wi-Fi 5/), Bluetooth 5.0
Size
height x width x depth (in mm): 6.6 x 225 x 184.5 ( = 0.26 x 8.86 x 7.26 in)
Battery
4600 mAh Lithium-Polymer
Operating System
Android 12
Camera
Primary Camera: 16 MPix LED flash
Additional features
Speakers: stereo speakers, USB-C cable, Boox Pen2Pro, 12 Months Warranty, fanless
Weight
450 g ( = 15.87 oz / 0.99 pounds) ( = 0 oz / 0 pounds)
Price
700 Euro
Note: The manufacturer may use components from different suppliers including display panels, drives or memory sticks with similar specifications.

 

Possible Competitors in Comparison

Evaluation
Date
Model
Weight
Storage
Size
Resolution
Starting From
82.2 %
12/2023
Onyx Boox Tab Ultra C Pro
SD 855, Adreno 640
450 g128 GB UFS 3.1 Flash10.30"1240x930
77.5 %
11/2023
Onyx Boox Note Air 3 C
SD 680, Adreno 610
430 g64 GB UFS 2.1 Flash10.30"1240x930
75.2 %
08/2023
Lenovo Smart Paper
RK3566, Mali-G52 MP2
408 g64 GB eMMC Flash10.30"1872x1404
79.4 %
08/2022
Huawei MatePad Paper
Kirin 820e, Mali-G57 MP6
360 g64 GB UFS 2.2 Flash10.30"1872x1404

Case and Equipment – A lot of storage inside the metal case

With its dark-gray, edgy metal case, the Onyx Boox Tab Ultra C Pro immediately shows that it is not an affordable e-reader. A plastic strip on the back that is ornamented with some small symbols also brings some variety and ensures a better WLAN reception. There is also a camera module on the back, causing the tablet to wobble slightly when you operate it while it is placed flat on a table.

At 450 grams (~1 lb), the Tab Ultra C Pro is heavier than similarly sized other e-ink tablets. The workmanship shows a good quality, but when you hold the device in your hands without a case, you might wish for more rounded edges.

With 6 GB of RAM and 128 GB of UFS 3.1 flash storage, the Onyx Boox tablet offers an ample amount of storage. While there is no headphone jack, you can connect a keyboard dock via Pogo Pins in the back. A USB-C port allows you to transfer data or charge the device.

Those for whom the plentiful storage is still insufficient can also use a microSD card. The card reader works fairly fast, although it is still unable to take full advantage of the maximum speeds of our high-quality Angelbird V60 reference card.

Onyx Boox Tab Ultra C Pro
Onyx Boox Tab Ultra C Pro
Onyx Boox Tab Ultra C Pro
Onyx Boox Tab Ultra C Pro
Onyx Boox Tab Ultra C Pro

Size Comparison

225.2 mm / 8.87 inch 182.7 mm / 7.19 inch 6.65 mm / 0.2618 inch 360 g0.794 lbs226 mm / 8.9 inch 193 mm / 7.6 inch 5.8 mm / 0.2283 inch 430 g0.948 lbs225 mm / 8.86 inch 184.5 mm / 7.26 inch 6.6 mm / 0.2598 inch 450 g0.992 lbs226 mm / 8.9 inch 195 mm / 7.68 inch 5.5 mm / 0.2165 inch 408 g0.899 lbs210 mm / 8.27 inch 148 mm / 5.83 inch 1 mm / 0.03937 inch 2.9 g0.00639 lbs
SD Card Reader - average JPG Copy Test (av. of 3 runs)
Onyx Boox Tab Ultra C Pro
  (Angelbird V60)
35.5 MB/s
Average of class Tablet
  (7.61 - 101.6, n=55, last 2 years)
31.4 MB/s -12%
Onyx Boox Note Air 3 C
  (Angelbird V60)
28.6 MB/s -19%

Cross Platform Disk Test (CPDT)

0510152025303540455055606570758085Tooltip
Onyx Boox Tab Ultra C Pro Adreno 640, SD 855, 128 GB UFS 3.1 Flash; SDCard Sequential Write 0.5 GB; Angelbird V60: Ø39.9 (27.9-51.7)
Onyx Boox Note Air 3 C Adreno 610, SD 680, 64 GB UFS 2.1 Flash; SDCard Sequential Write 0.5 GB; Angelbird V60: Ø43.5 (28.7-54.3)
Onyx Boox Tab Ultra C Pro Adreno 640, SD 855, 128 GB UFS 3.1 Flash; SDCard Sequential Read 0.5 GB; Angelbird V60: Ø78 (29-85.6)
Onyx Boox Note Air 3 C Adreno 610, SD 680, 64 GB UFS 2.1 Flash; SDCard Sequential Read 0.5 GB; Angelbird V60: Ø77.9 (35.8-86.7)

Communication, Software, and Operation – Android support and pen input

The Onyx Boox Tab Ultra C Pro is equipped with a WiFi 5 module that reaches good transfer rates around 500 Mbit/s thanks to several antennas. While this won't allow you to make full use of a Gigabit Internet connection, fast transfer rates with a fairly stable data rate are still possible according to the tests with our Asus ROG Rapture AXE 11000 reference router.

However, the Huawei MatePad Paper, which is equipped with an even significantly faster WiFi 6 modem, also shows that more is possible in this regard.

The software of the tablet is based on Android 12, with the user interface adjusted to the e-ink display. Since the Google Play Store is already preinstalled, you can also easily install Android apps, which extends the usage scenarios of the tablet significantly. Other preinstalled apps include a dictionary, a note taking app, a document scanner, and a music player.

At the time of our testing, the most recent software comes from the end of October 2023, so it is still fairly current. Even though Onyx offers updates from time to time, there is no concrete promise of a specific period of updates.

The capacitive touchscreen works reliably, although the e-ink display only offers slow response times. Even though they are compensated well by the fast SoC in the Onyx Boox Tab Ultra C Pro, the operation is still not as smooth as in a tablet with an IPS or OLED screen. There is also a fingerprint sensor integrated into the standby button to provide some security. It works reliably and unlocks the device fairly quickly.

Onyx has also included a stylus that can be used for drawing or notetaking. A keyboard cover with touchpad, which turns the tablet into a good laptop replacement, is also available for the Tab Ultra C Pro. The accessory is available for about 170 Euros (~$183) from KEX who provided our loaner.

Networking
iperf3 transmit AXE11000
Huawei MatePad Paper
945 (826min - 958max) MBit/s +101%
Onyx Boox Tab Ultra C Pro
470.3 (462min - 483max) MBit/s
Onyx Boox Note Air 3 C
350 (322min - 366max) MBit/s -26%
Lenovo Smart Paper
286 (236min - 308max) MBit/s -39%
iperf3 receive AXE11000
Huawei MatePad Paper
928 (812min - 949max) MBit/s +84%
Onyx Boox Tab Ultra C Pro
505 (437min - 545max) MBit/s
Onyx Boox Note Air 3 C
294 (274min - 318max) MBit/s -42%
Lenovo Smart Paper
211 (186min - 246max) MBit/s -58%

Legend

 
Onyx Boox Tab Ultra C Pro Qualcomm Snapdragon 855, Qualcomm Adreno 640, 128 GB UFS 3.1 Flash
 
Onyx Boox Note Air 3 C Qualcomm Snapdragon 680 4G, Qualcomm Adreno 610, 64 GB UFS 2.1 Flash
 
Lenovo Smart Paper Rockchip RK3566, ARM Mali-G52 MP2, 64 GB eMMC Flash
 
Huawei MatePad Paper HiSilicon Kirin 820e, ARM Mali-G57 MP6, 64 GB UFS 2.2 Flash
0306090120150180210240270300330360390420450480510540Tooltip
Onyx Boox Tab Ultra C Pro; iperf3 receive AXE11000; iperf 3.1.3: Ø504 (437-545)
Onyx Boox Tab Ultra C Pro; iperf3 transmit AXE11000; iperf 3.1.3: Ø470 (462-483)

Cameras – A simple camera with a surprise

The back of the tablet houses a 16 Megapixel camera including LED flash, which is suited for scanning QR codes and documents, but also allows you to take pictures. While the quality isn't outstanding, it is sufficient for snapshots or documenting a situation.

The resulting pictures appear dark and in low light conditions also very blurry and with a significant color tint. You shouldn't expect to be able to see too many details. In our studio under full illumination, the pictures turn out very washed out, and at only 1 Lux of illumination, the image is just barely recognizable.

You can also record videos, and that even in 4K resolution. But the image quality is also only mediocre, although this feature by itself is extraordinary for a tablet with an e-ink display.

Image Comparison

Choose a scene and navigate within the first image. One click changes the position on touchscreens. One click on the zoomed-in image opens the original in a new window. The first image shows the scaled photograph of the test device.

Hauptkamera PflanzeHauptkamera UmgebungHauptkamera Low Light
ColorChecker
8.2 ∆E
10.2 ∆E
2 ∆E
9.4 ∆E
5.7 ∆E
5.3 ∆E
6.8 ∆E
3.8 ∆E
13.2 ∆E
8.7 ∆E
4.6 ∆E
2.6 ∆E
3 ∆E
7.4 ∆E
14.3 ∆E
3.8 ∆E
11.4 ∆E
7 ∆E
9.4 ∆E
10.3 ∆E
8.8 ∆E
8.3 ∆E
10.1 ∆E
10.6 ∆E
ColorChecker Onyx Boox Tab Ultra C Pro: 7.7 ∆E min: 2.01 - max: 14.3 ∆E
ColorChecker
34.2 ∆E
55.1 ∆E
38.8 ∆E
33.1 ∆E
43.5 ∆E
64.7 ∆E
52.8 ∆E
37 ∆E
44.1 ∆E
27.8 ∆E
62.8 ∆E
61.3 ∆E
30.7 ∆E
46 ∆E
36.5 ∆E
76.1 ∆E
41.8 ∆E
43.5 ∆E
93 ∆E
69.8 ∆E
51 ∆E
35.5 ∆E
21.8 ∆E
11.7 ∆E
ColorChecker Onyx Boox Tab Ultra C Pro: 46.36 ∆E min: 11.68 - max: 92.97 ∆E

E-Reading – Very flexible with app support

Although the Onyx Store cannot be used in Europe, it offers at least some open-source books, mainly in English, for download. However, with the app support, you can also install and use apps such as Tolino, Kindle, or other reader apps without any problems. But most users would want to purchase books mainly using the browser anyways, since Google keeps a margin for in-app purchases that is too high for most vendors.

With pdf (reflowable), epub, Adobe DRM, txt, rtf, html, chm, doc, and fb2, the support for various data types is decent and can also be expanded via the app support.

The fast processor makes leafing through books very enjoyable, with new pages being rendered very quickly. The preinstalled reader app allows you to configure the display extensively, and thanks to AI support, figures and schematics in the books are drawn to perfection and highlighted sections are displayed accurately.

Display – Colorful e-ink panel with illumination

Closeup of the display
Closeup of the display

The way the e-ink display of the Onyx tablet works is completely different from IPS or OLED screens: Small ink particles are integrated into the individual pixels, which can be activated by different electrical charges. In black-and-white mode, the e-ink display reaches an expanded Full-HD resolution of 2,480 x 1,860 pixels, and half of that in color mode.  

At 4,096 color tones, the color display is also far from the smoothness of an LCD display, although it is still very nice for colored comix or documents. But due to the fairly large display, the low resolution in color mode becomes clearly noticeable.

While it is quite possible to play video content on the screen of the Onyx Boox Tab Ultra C Pro fairly smoothly, the image often still appears smudged due to the few colors and remaining ghosting from the previous images. So e-ink isn't really a replacement of an IPS or OLED display in this regard.

With daylight, you don't need any background illumination to be able to read the image contents, and once the image has been rendered, the screen doesn't consume any more power either. But if it is darker, the illumination turns out slightly weak at a maximum of 45 cd/m², and the Lenovo Smart Paper, for example, delivers significantly more brightness here.

Particularly black-and-white content appears very sharp, and due to the powerful SoC, new images are rendered very quickly for an e-ink panel. In addition, this technology also doesn't create any PWM flickering.

44
cd/m²
45
cd/m²
43
cd/m²
43
cd/m²
44
cd/m²
42
cd/m²
43
cd/m²
44
cd/m²
41
cd/m²
Distribution of brightness
tested with X-Rite i1Pro 2
Maximum: 45 cd/m² (Nits) Average: 43.2 cd/m² Minimum: 0.1 cd/m²
Brightness Distribution: 91 %
Center on Battery: 44 cd/m²
Contrast: ∞:1 (Black: 0 cd/m²)
ΔE Color 19.76 | 0.5-29.43 Ø5
ΔE Greyscale 10.5 | 0.57-98 Ø5.3
1.1% sRGB (Calman 2D)
Gamma: 1.202
Onyx Boox Tab Ultra C Pro
E-Ink, 1240x930, 10.30
Onyx Boox Note Air 3 C
E-Ink Kaleido 3, 1240x930, 10.30
Lenovo Smart Paper
E-Ink, 1872x1404, 10.30
Huawei MatePad Paper
E-Ink, 1872x1404, 10.30
Response Times
-3%
23%
-6%
Response Time Grey 50% / Grey 80% *
105.5 ?(50.8, 54.7)
121 ?(66.8, 54.2)
-15%
134.4 ?(56.2, 68.2)
-27%
121 ?(61, 60)
-15%
Response Time Black / White *
98.1 ?(45.6, 52.5)
89.3 ?(43.5, 45.8)
9%
27.5 ?(14.4, 13.1)
72%
94 ?(47, 47)
4%
PWM Frequency
Screen
0%
75%
21%
Brightness middle
44
46.5
6%
113
157%
61.9
41%
Brightness
43
47
9%
106
147%
60
40%
Brightness Distribution
91
91
0%
83
-9%
80
-12%
Black Level *
Colorchecker dE 2000 *
19.76
20.45
-3%
Colorchecker dE 2000 max. *
37.12
39.33
-6%
Greyscale dE 2000 *
10.5
11.1
-6%
9.9
6%
9.1
13%
Gamma
1.202 183%
1.211 182%
1.371 160%
2.02 109%
CCT
6629 98%
6463 101%
7116 91%
6848 95%
Total Average (Program / Settings)
-2% / -1%
49% / 58%
8% / 12%

* ... smaller is better

Display Response Times

Display response times show how fast the screen is able to change from one color to the next. Slow response times can lead to afterimages and can cause moving objects to appear blurry (ghosting). Gamers of fast-paced 3D titles should pay special attention to fast response times.
       Response Time Black to White
98.1 ms ... rise ↗ and fall ↘ combined↗ 45.6 ms rise
↘ 52.5 ms fall
The screen shows slow response rates in our tests and will be unsatisfactory for gamers.
In comparison, all tested devices range from 0.1 (minimum) to 240 (maximum) ms. » 100 % of all devices are better.
This means that the measured response time is worse than the average of all tested devices (21.6 ms).
       Response Time 50% Grey to 80% Grey
105.5 ms ... rise ↗ and fall ↘ combined↗ 50.8 ms rise
↘ 54.7 ms fall
The screen shows slow response rates in our tests and will be unsatisfactory for gamers.
In comparison, all tested devices range from 0.2 (minimum) to 636 (maximum) ms. » 100 % of all devices are better.
This means that the measured response time is worse than the average of all tested devices (34 ms).

Screen Flickering / PWM (Pulse-Width Modulation)

To dim the screen, some notebooks will simply cycle the backlight on and off in rapid succession - a method called Pulse Width Modulation (PWM) . This cycling frequency should ideally be undetectable to the human eye. If said frequency is too low, users with sensitive eyes may experience strain or headaches or even notice the flickering altogether.
Screen flickering / PWM not detected

In comparison: 53 % of all tested devices do not use PWM to dim the display. If PWM was detected, an average of 18170 (minimum: 5 - maximum: 3846000) Hz was measured.

CalMAN Grayscale
CalMAN Grayscale
CalMAN Color Accuracy
CalMAN Color Accuracy
CalMAN sRGB Color Space
CalMAN sRGB Color Space
CalMAN Saturation
CalMAN Saturation

Performance, Emissions, and Battery Life – Old processor with a lot of power

The Qualcomm Snapdragon 855 is already an older high-end processor that was also used in more affordable high-end smartphones some time ago. With this, the Onyx Boox Tab Ultra C Pro is one of the fastest currently available tablets with an e-ink display. Despite the slow response of the panel, you can still navigate fairly quickly through the menus.

Almost all of the available apps run on the tablet without any problems, and multitasking also creates no problem. In addition, the graphics performance is also at a high level. The UFS 3.1 storage used by Onyx here is a good match, allowing for very fast data transfer and short load times. Even though the storage controller doesn't run quite optimally here, causing a write performance of the tablet that is less than convincing, the data storage is still very fast overall.

There is no noticeable warming of the Onyx Boxx Tab Ultra C Pro under load, and the SoC doesn't throttle its performance under high or continuous loads.

The e-ink tablet includes stereo speakers on the sides, which don't sound too bad either. Even though the maximum volume isn't very high, the music doesn't sound distorted and is easy to listen to. You can also connect headphones or speakers via USB-C or Bluetooth. Unfortunately, we are unable to find out which codecs for wireless transfer are supported, since the software of the Onyx Boox tablet doesn't provide this information.

At a capacity of 4,600 mAh, the battery of the e-ink tablet is very powerful, lasting considerably longer than the competitors: You can read up to 20:44 hours with minimal display illumination, so there should be nothing in the way of a whole day of reading on the couch. It takes 3 hours or more to fully recharge the tablet, depending on the battery level at the beginning.

Geekbench 5.5
Single-Core
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
744 Points
Average Qualcomm Snapdragon 855
  (552 - 751, n=7)
717 Points -4%
Average of class Tablet
  (140 - 1892, n=64, last 2 years)
678 Points -9%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
566 Points -24%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
323 Points -57%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
143 Points -81%
Multi-Core
Average Qualcomm Snapdragon 855
  (2164 - 2856, n=7)
2572 Points +13%
Average of class Tablet
  (312 - 8524, n=64, last 2 years)
2429 Points +7%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
2268 Points
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
1853 Points -18%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
1287 Points -43%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
312 Points -86%
Geekbench 6.2
Single-Core
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
1008 Points
Average Qualcomm Snapdragon 855
 
1008 Points 0%
Average of class Tablet
  (185 - 2107, n=39, last 2 years)
796 Points -21%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
436 Points -57%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
203 Points -80%
Multi-Core
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
2757 Points
Average Qualcomm Snapdragon 855
 
2757 Points 0%
Average of class Tablet
  (493 - 5652, n=39, last 2 years)
2251 Points -18%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
865 Points -69%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
493 Points -82%
PCMark for Android - Work 3.0
Average of class Tablet
  (3195 - 17267, n=60, last 2 years)
8491 Points +1%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
8421 Points
Average Qualcomm Snapdragon 855
 
8421 Points 0%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
4535 Points -46%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
4045 Points -52%
3DMark
2560x1440 Sling Shot Extreme (ES 3.1)
Average Qualcomm Snapdragon 855
  (4556 - 5747, n=20)
5489 Points +13%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
4851 Points
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
2571 Points -47%
Average of class Tablet
  (361 - 14235, n=48, last 2 years)
1971 Points -59%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
1231 Points -75%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
567 Points -88%
2560x1440 Sling Shot Extreme (ES 3.1) Graphics
Average Qualcomm Snapdragon 855
  (5429 - 6362, n=20)
6201 Points +14%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
5429 Points
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
2675 Points -51%
Average of class Tablet
  (290 - 24605, n=48, last 2 years)
2086 Points -62%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
1077 Points -80%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
517 Points -90%
2560x1440 Sling Shot Extreme (ES 3.1) Physics
Average Qualcomm Snapdragon 855
  (2705 - 4612, n=20)
3954 Points +12%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
3534 Points
Average of class Tablet
  (858 - 5751, n=48, last 2 years)
2755 Points -22%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
2462 Points -30%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
2262 Points -36%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
858 Points -76%
2560x1440 Sling Shot Extreme (ES 3.1) Unlimited
Average Qualcomm Snapdragon 855
  (3969 - 6404, n=20)
5819 Points 0%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
5803 Points
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
4281 Points -26%
Average of class Tablet
  (267 - 14235, n=56, last 2 years)
3123 Points -46%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
1079 Points -81%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
596 Points -90%
2560x1440 Sling Shot Extreme (ES 3.1) Unlimited Graphics
Average Qualcomm Snapdragon 855
  (5184 - 7148, n=20)
6793 Points +2%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
6636 Points
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
4472 Points -33%
Average of class Tablet
  (240 - 24605, n=56, last 2 years)
3719 Points -44%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
1191 Points -82%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
530 Points -92%
2560x1440 Sling Shot Extreme (ES 3.1) Unlimited Physics
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
4031 Points
Average Qualcomm Snapdragon 855
  (1934 - 5024, n=20)
3942 Points -2%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
3725 Points -8%
Average of class Tablet
  (441 - 5751, n=56, last 2 years)
3187 Points -21%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
1061 Points -74%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
812 Points -80%
Wild Life Score
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
2951 Points
Average Qualcomm Snapdragon 855
 
2951 Points 0%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
1925 Points -35%
Average of class Tablet
  (286 - 10018, n=56, last 2 years)
1699 Points -42%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
437 Points -85%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
286 Points -90%
Wild Life Unlimited Score
Average of class Tablet
  (289 - 25317, n=62, last 2 years)
3203 Points +4%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
3079 Points
Average Qualcomm Snapdragon 855
 
3079 Points 0%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
1886 Points -39%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
418 Points -86%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
289 Points -91%
Wild Life Extreme
Average of class Tablet
  (75 - 6919, n=62, last 2 years)
915 Points +6%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
867 Points
Average Qualcomm Snapdragon 855
 
867 Points 0%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
625 Points -28%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
130 Points -85%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
75 Points -91%
Wild Life Extreme Unlimited
Average of class Tablet
  (72 - 6909, n=60, last 2 years)
960 Points +11%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
864 Points
Average Qualcomm Snapdragon 855
 
864 Points 0%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
609 Points -30%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
125 Points -86%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
72 Points -92%
GFXBench
on screen Aztec Ruins Normal Tier Onscreen
Average Qualcomm Snapdragon 855
  (17 - 38, n=20)
32.5 fps +71%
Average of class Tablet
  (3 - 111, n=66, last 2 years)
21.2 fps +12%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
19 fps 0%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
19 fps
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
4.6 fps -76%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
3 fps -84%
1920x1080 Aztec Ruins Normal Tier Offscreen
Average Qualcomm Snapdragon 855
  (22 - 43, n=21)
39.9 fps +5%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
38 fps
Average of class Tablet
  (2.5 - 279, n=66, last 2 years)
37.5 fps -1%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
29 fps -24%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
7.6 fps -80%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
3.9 fps -90%
on screen Aztec Ruins High Tier Onscreen
Average Qualcomm Snapdragon 855
  (11 - 26, n=20)
20.9 fps +61%
Average of class Tablet
  (1.9 - 97.3, n=66, last 2 years)
14.8 fps +14%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
13 fps 0%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
13 fps
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
2.7 fps -79%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
1.9 fps -85%
2560x1440 Aztec Ruins High Tier Offscreen
Average Qualcomm Snapdragon 855
  (8.5 - 24, n=21)
16.2 fps +8%
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
15 fps
Average of class Tablet
  (0.9 - 90, n=66, last 2 years)
14 fps -7%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
10 fps -33%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
2.9 fps -81%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
1.4 fps -91%
3840x2160 4K Aztec Ruins High Tier Offscreen
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
6.6 fps
Average Qualcomm Snapdragon 855
 
6.6 fps 0%
Average of class Tablet
  (0.4 - 48, n=63, last 2 years)
6.29 fps -5%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
4.8 fps -27%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
1.3 fps -80%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
0.6 fps -91%
Octane V2 - Total Score
Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144
33918 Points
Average Qualcomm Snapdragon 855
  (17011 - 33918, n=21)
23749 Points -30%
Average of class Tablet
  (2672 - 74614, n=68, last 2 years)
23080 Points -32%
Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096
18755 Points -45%
Onyx Boox Note Air 3 C
Qualcomm Snapdragon 680 4G, Adreno 610, 4096
6358 Points -81%
Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096
5022 Points -85%
Onyx Boox Tab Ultra C ProOnyx Boox Note Air 3 CLenovo Smart PaperHuawei MatePad PaperAverage 128 GB UFS 3.1 FlashAverage of class Tablet
AndroBench 3-5
-16%
-82%
-21%
54%
-2%
Sequential Read 256KB
1487
690.8
-54%
163
-89%
880.1
-41%
1600 ?(1030 - 3134, n=53)
8%
836 ?(163 - 3414, n=63, last 2 years)
-44%
Sequential Write 256KB
302.2
384.1
27%
139
-54%
256.2
-15%
772 ?(233 - 1332, n=53)
155%
530 ?(78.2 - 2528, n=63, last 2 years)
75%
Random Read 4KB
226.8
157.7
-30%
25.3
-89%
145.6
-36%
244 ?(126.2 - 428, n=53)
8%
164.2 ?(18.4 - 451, n=63, last 2 years)
-28%
Random Write 4KB
169.9
160.5
-6%
8.8
-95%
183.1
8%
244 ?(121.4 - 503, n=53)
44%
148.8 ?(8.23 - 503, n=63, last 2 years)
-12%

Temperatures

Max. Load
 23.5 °C
74 F
23.6 °C
74 F
23.6 °C
74 F
 
 23.8 °C
75 F
24.5 °C
76 F
23.8 °C
75 F
 
 24.1 °C
75 F
25.2 °C
77 F
24.2 °C
76 F
 
Maximum: 25.2 °C = 77 F
Average: 24 °C = 75 F
24.5 °C
76 F
24.5 °C
76 F
24.5 °C
76 F
24.5 °C
76 F
24.7 °C
76 F
24.7 °C
76 F
24.5 °C
76 F
25.6 °C
78 F
25.2 °C
77 F
Maximum: 25.6 °C = 78 F
Average: 24.7 °C = 76 F
Power Supply (max.)  42.1 °C = 108 F | Room Temperature 20 °C = 68 F | Fluke t3000FC (calibrated), Voltcraft IR-260
(+) The average temperature for the upper side under maximal load is 24 °C / 75 F, compared to the average of 30 °C / 86 F for the devices in the class Tablet.
(+) The maximum temperature on the upper side is 25.2 °C / 77 F, compared to the average of 33.8 °C / 93 F, ranging from 20.7 to 53.2 °C for the class Tablet.
(+) The bottom heats up to a maximum of 25.6 °C / 78 F, compared to the average of 33.3 °C / 92 F
(+) In idle usage, the average temperature for the upper side is 21.3 °C / 70 F, compared to the device average of 30 °C / 86 F.


Heatmap front
Heatmap front
Heatmap back
Heatmap back
01234567891011121314151617Tooltip
Onyx Boox Tab Ultra C Pro Adreno 640, SD 855, 128 GB UFS 3.1 Flash; Wild Life Extreme Stress Test; 1.1.4.1: Ø4.53 (4.51-4.71)
Lenovo Smart Paper Mali-G52 MP2, RK3566, 64 GB eMMC Flash; Wild Life Extreme Stress Test; 1.1.0.2: Ø0.447 (0.4391-0.4529)
Huawei MatePad Paper Mali-G57 MP6, Kirin 820e, 64 GB UFS 2.2 Flash; Wild Life Extreme Stress Test; 1.0.9.1: Ø3.74 (3.73-3.75)
Onyx Boox Tab Ultra C Pro Adreno 640, SD 855, 128 GB UFS 3.1 Flash; Wild Life Stress Test Stability; 0.0.0.0: Ø16.1 (15.8-17.5)
Lenovo Smart Paper Mali-G52 MP2, RK3566, 64 GB eMMC Flash; Wild Life Stress Test Stability; 0.0.0.0: Ø1.728 (1.71-1.735)
Huawei MatePad Paper Mali-G57 MP6, Kirin 820e, 64 GB UFS 2.2 Flash; Wild Life Stress Test Stability; 0.0.0.0: Ø11.3 (10.9-11.3)

Speakers

dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs203837.42529.431.53126.326.64032.8295037.832.46329.724.58022.717.710018.917.412520.622.816012.935.52009.236.425010.343.53157.3484006.854.65008.659.263012.364.380010.763.910001166.712508.760.716008.76220009.260.9250010.261.9315011.465.6400013.255500014.555.3630014.459.1800015.361.51000016.350.91250016.3421600017.230.1SPL24.773.8N0.532.7median 11.4median 55.3Delta3.310.943.939.334.536.227.729.728.535.633.235.226.334.823.432.422.538.215.443.714.649.612.352.313.357.711.659.77.562.811.467.815.266.814.769.811.872.7127310.376.29.372.310.869.814.767.614.358.914.964.11566.615.46316.856.416.151.91754.225.982.10.750.6median 14.6median 632.17.8hearing rangehide median Pink NoiseOnyx Boox Tab Ultra C ProHuawei MatePad Paper
Frequency diagram (checkboxes can be checked and unchecked to compare devices)
Onyx Boox Tab Ultra C Pro audio analysis

(±) | speaker loudness is average but good (73.8 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 21.4% lower than median
(±) | linearity of bass is average (11.7% delta to prev. frequency)
Mids 400 - 2000 Hz
(±) | higher mids - on average 6.4% higher than median
(±) | linearity of mids is average (7.9% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 4.5% away from median
(±) | linearity of highs is average (10.5% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (26.5% difference to median)
Compared to same class
» 79% of all tested devices in this class were better, 3% similar, 18% worse
» The best had a delta of 7%, average was 23%, worst was 129%
Compared to all devices tested
» 78% of all tested devices were better, 4% similar, 18% worse
» The best had a delta of 4%, average was 25%, worst was 134%

Huawei MatePad Paper audio analysis

(+) | speakers can play relatively loud (82.1 dB)
Bass 100 - 315 Hz
(±) | reduced bass - on average 12.8% lower than median
(±) | linearity of bass is average (9.4% delta to prev. frequency)
Mids 400 - 2000 Hz
(±) | higher mids - on average 7.2% higher than median
(+) | mids are linear (5.7% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 3.8% away from median
(±) | linearity of highs is average (9.2% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (17.6% difference to median)
Compared to same class
» 35% of all tested devices in this class were better, 6% similar, 59% worse
» The best had a delta of 7%, average was 23%, worst was 129%
Compared to all devices tested
» 29% of all tested devices were better, 8% similar, 63% worse
» The best had a delta of 4%, average was 25%, worst was 134%

Battery Life

Battery Runtime - WiFi Websurfing max. Brightness
Huawei MatePad Paper
3625 mAh
478 min
Average of class Tablet
  (264 - 478, n=3, last 2 years)
371 min
Battery Runtime - Reader / Idle
Average of class Tablet
  (746 - 5003, n=51, last 2 years)
1934 min +55%
Onyx Boox Tab Ultra C Pro
4600 mAh
1244 min
Onyx Boox Note Air 3 C
3700 mAh
1030 min
Lenovo Smart Paper
3500 mAh
1056 min
Huawei MatePad Paper
3625 mAh
963 min
Battery Runtime
Idle (without WLAN, min brightness)
20h 44min

Pros

+ long battery life
+ high-quality metal case
+ fast processor
+ a lot of storage
+ camera including 4K video recording
+ input pen included
+ compatible with Android apps
+ reading without eye strain

Cons

- heavy
- limited suitability for playing videos
- high price
- display with slow response times

Verdict – One of the fastest e-ink tablets

Testing the Onyx Boox Tab Ultra C Pro. Test unit provided by Kex GmbH (Kex.de)
Testing the Onyx Boox Tab Ultra C Pro. Test unit provided by Kex GmbH (Kex.de)

With a lot of power, pen input, a color screen, a large battery, an ample amount of storage, and even a camera, the Onyx Boox Tab Ultra C Pro is probably one of the best-equipped e-ink tablets that is currently available. For a hefty sum of 700 Euros ($650 in the US), you get an absolutely smooth system that also allows you to install and use Android apps without any problems. The fast storage that offers an ample amount of space is a great bonus and can even be optionally expanded via microSD card.

The e-ink color display in this tablet is fun and even fast enough to be able to play videos fairly smoothly. On the other hand, the very limited color space and pale color display, as well as the ghosting traces that often remain visible make the tablet unsuitable for more frequent video reproduction. The accurate pen input makes up for this, allowing users to also use the tablet for some productive work.

The speakers produce a good sound, and the battery life is also completely convincing.

The camera is meant more for snapshots and scanning QR codes or documents, but it is a nice addition and almost a unique feature in an e-ink tablet. The high weight might become tiring for your arms to hold when reading for longer, and the Huawei MatePad Paper also shows that a higher WLAN speed is achievable.

The Onyx Boox Tab Ultra C Pro offers extensive equipment and some unique features that justify the high price.

If you can make do without the color display, some significantly more affordable alternatives such as the similarly powerful Huawei MatePad Paper are also available, although that is limited in terms of the app compatibility. The Onyx Boox Note Air 3 C offers slightly less power and doesn't have a camera, but it also has a color display and is significantly cheaper.

Price and Availability

The Onyx Boox Tab Ultra C Pro is available for ~$650 from the Onyx Boox online store or from Amazon. If you purchase the tablet from the Onyx Boox store, a magnetic protective case cover and some replacement pen tips are included. A keyboard cover is also available for an additional ~$150.  

Onyx Boox Tab Ultra C Pro - 12/08/2023 v7
Florian Schmitt

Chassis
84 / 98 → 85%
Keyboard
69%
Pointing Device
81 / 40-88 → 85%
Connectivity
42%
Weight
84%
Battery
85 / 92 → 92%
Display
68%
Games Performance
50%
Application Performance
86 / 91 → 94%
Temperature
98%
Noise
100%
Audio
66%
Camera
57%
Average
75%
82%
Tablet - Weighted Average

Transparency

The present review sample was made available to the author as a loan by the manufacturer or a shop for the purposes of review. The lender had no influence on this review, nor did the manufacturer receive a copy of this review before publication. There was no obligation to publish this review.

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> Expert Reviews and News on Laptops, Smartphones and Tech Innovations > Reviews > Onyx Boox Tab Ultra C Pro review – High-end tablet with color e-ink display and camera
Florian Schmitt, 2023-12-10 (Update: 2023-12-10)