Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Boox - Note Air 4 C | Kobo - Clara BW |
|---|---|---|
| Storage | 64 GB | 16 GB |
| Weight | 420 g | 172 g |
| Screen size | 10.3 " | 6 " |
| Color screen | true | false |
| Waterproof | false | true |
Between the Note Air 4 C and Clara BW, the Note Air 4 C comes out ahead in storage / screen size, while the Clara BW wins on weight / waterproof. Overall, the Note Air 4 C scores 77.7 and the Clara BW scores 67.2 on our Mars Score.
Which should you buy?
The Note Air 4 C is the clear pick on raw spec strength, leading by 10.5 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 Note Air 4 C 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 — 300.00% more. 64 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 — 248.00 g less. 172 vs 420.
Both ship with comparable resolution, so those specs do not separate the two — focus on the differences below.
Bottom line: the Note Air 4 C 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 - Note Air 4 C or Kobo - Clara BW?
Boox - Note Air 4 C leads the current Mars Score by 10.5 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 - Note Air 4 C if…
Boox - Note Air 4 C 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 - Note Air 4 C wins
- ▲Storage — 300.00% more. 64 GB vs 16 GB.
- ▲Screen size — 71.67% more. 10.3 " vs 6 ".
- ▲Has Color screen.
Why Kobo - Clara BW wins
- ▲Weight — 248.00 g less. 172 vs 420.
- ▲Has Waterproof.
Spec comparison
Display
| Spec | Boox - Note Air 4 C | 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 - Note Air 4 C | Kobo - Clara BW |
|---|---|---|
| Weight | 420 g | 172 glead |
| Waterproof | false | truelead |
| Page-turn buttons | false | false |
Storage & Battery
| Spec | Boox - Note Air 4 C | Kobo - Clara BW |
|---|---|---|
| Storageⓘ | 64 GBlead | 16 GB |
| Battery life | 3 weeks | 6 weekslead |