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 2 |
|---|---|---|
| Weight | 420 g | 215 g |
| Storage | 64 GB | 32 GB |
| Screen size | 10.3 " | 7 " |
| Color screen | true | false |
| Waterproof | false | true |
Between the Note Air 4 C and Libra 2, the Note Air 4 C comes out ahead in storage / screen size, while the Libra 2 wins on weight / waterproof. Overall, the Note Air 4 C scores 77.7 and the Libra 2 scores 71 on our Mars Score.
Which should you buy?
The Note Air 4 C edges ahead on the Mars Score (77.7 vs 71), but the 6.7-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, color screen. The single most decisive one: Storage — 100.00% more. 64 GB vs 32 GB.
Pick the Libra 2 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 — 205.00 g less. 215 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 - Libra 2?
Boox - Note Air 4 C leads the current Mars Score by 6.7 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 - Libra 2 if…
Kobo - Libra 2 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 ".
- ▲Has Color screen.
Why Kobo - Libra 2 wins
- ▲Weight — 205.00 g less. 215 vs 420.
- ▲Has Waterproof.
Spec comparison
Display
| Spec | Boox - Note Air 4 C | Kobo - Libra 2 |
|---|---|---|
| Screen size | 10.3 "lead | 7 " |
| Resolution | 300 ppi | 300 ppi |
| Color screen | truelead | false |
| Warm light | true | true |
Design
| Spec | Boox - Note Air 4 C | Kobo - Libra 2 |
|---|---|---|
| Weight | 420 g | 215 glead |
| Waterproof | false | truelead |
| Page-turn buttons | false | truelead |
Storage & Battery
| Spec | Boox - Note Air 4 C | Kobo - Libra 2 |
|---|---|---|
| Storageⓘ | 64 GBlead | 32 GB |
| Battery life | 3 weeks | 6 weekslead |