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 - Libra Colour |
|---|---|---|
| Weight | 420 g | 199 g |
| Storage | 64 GB | 32 GB |
| Screen size | 10.3 " | 7 " |
| Waterproof | false | true |
Between the Note Air 4 C and Libra Colour, the Note Air 4 C comes out ahead in storage / screen size, while the Libra Colour wins on weight / waterproof. Overall, the Note Air 4 C scores 77.7 and the Libra Colour scores 71.5 on our Mars Score.
Which should you buy?
The Note Air 4 C edges ahead on the Mars Score (77.7 vs 71.5), but the 6.2-point gap is small enough that the right pick comes down to which spec advantages matter to you.
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. The single most decisive one: Storage — 100.00% more. 64 GB vs 32 GB.
Pick the Libra Colour 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 — 221.00 g less. 199 vs 420.
Both ship with comparable resolution, color screen, 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 - Libra Colour?
Boox - Note Air 4 C leads the current Mars Score by 6.2 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.
Choose Kobo - Libra Colour if…
Kobo - Libra Colour 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 — 100.00% more. 64 GB vs 32 GB.
- ▲Screen size — 47.14% more. 10.3 " vs 7 ".
Why Kobo - Libra Colour wins
- ▲Weight — 221.00 g less. 199 vs 420.
- ▲Has Waterproof.
Spec comparison
Display
| Spec | Boox - Note Air 4 C | Kobo - Libra Colour |
|---|---|---|
| Screen size | 10.3 "lead | 7 " |
| Resolution | 300 ppi | 300 ppi |
| Color screen | true | true |
| Warm light | true | true |
Design
| Spec | Boox - Note Air 4 C | Kobo - Libra Colour |
|---|---|---|
| Weight | 420 g | 199 glead |
| Waterproof | false | truelead |
| Page-turn buttons | false | truelead |
Storage & Battery
| Spec | Boox - Note Air 4 C | Kobo - Libra Colour |
|---|---|---|
| Storageⓘ | 64 GBlead | 32 GB |
| Battery life | 3 weeks | 6 weekslead |