Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Boox - Tab Ultra C Pro | Kobo - Clara BW |
|---|---|---|
| Storage | 128 GB | 16 GB |
| Weight | 480 g | 172 g |
| Screen size | 10.3 " | 6 " |
| Color screen | true | false |
| Waterproof | false | true |
Between the Tab Ultra C Pro and Clara BW, the Tab Ultra C Pro comes out ahead in storage / screen size, while the Clara BW wins on weight / waterproof. Overall, the Tab Ultra C Pro scores 84.3 and the Clara BW scores 67.2 on our Mars Score.
Which should you buy?
The Tab Ultra C Pro is the clear pick on raw spec strength, leading by 17.1 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Tab Ultra C Pro if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are storage, screen size, color screen. The single most decisive one: Storage — 700.00% more. 128 GB vs 16 GB.
Pick the Clara BW if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight, waterproof. The single most decisive one: Weight — 308.00 g less. 172 vs 480.
Both ship with comparable resolution, so those specs do not separate the two — focus on the differences below.
Bottom line: the Tab Ultra C Pro is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Boox - Tab Ultra C Pro or Kobo - Clara BW?
Boox - Tab Ultra C Pro leads the current Mars Score by 17.1 points.The more useful decision is the trade-off behind that result: compare screen size, storage, weight against the way you will actually use the product.
Choose Boox - Tab Ultra C Pro if…
Boox - Tab Ultra C Pro has the measurable edge on storage gb, screen size in, has color screen.
Choose Kobo - Clara BW if…
Kobo - Clara BW has the measurable edge on weight g, waterproof.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Boox - Tab Ultra C Pro wins
- ▲Storage — 700.00% more. 128 GB vs 16 GB.
- ▲Screen size — 71.67% more. 10.3 " vs 6 ".
- ▲Has Color screen.
Why Kobo - Clara BW wins
- ▲Weight — 308.00 g less. 172 vs 480.
- ▲Has Waterproof.
Spec comparison
Display
| Spec | Boox - Tab Ultra C Pro | Kobo - Clara BW |
|---|---|---|
| Screen size | 10.3 "lead | 6 " |
| Resolution | 300 ppi | 300 ppi |
| Color screen | truelead | false |
| Warm light | true | true |
Design
| Spec | Boox - Tab Ultra C Pro | Kobo - Clara BW |
|---|---|---|
| Weight | 480 g | 172 glead |
| Waterproof | false | truelead |
| Page-turn buttons | false | false |
Storage & Battery
| Spec | Boox - Tab Ultra C Pro | Kobo - Clara BW |
|---|---|---|
| Storageⓘ | 128 GBlead | 16 GB |
| Battery life | 2 weeks | 6 weekslead |