Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Boox - Page | Kobo - Sage |
|---|---|---|
| Weight | 195 g | 240 g |
| Screen size | 7 " | 8 " |
| Waterproof | false | true |
Between the Page and Sage, the Page comes out ahead in weight, while the Sage wins on screen size / waterproof. Overall, the Page scores 71.7 and the Sage scores 73.1 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (71.7 vs 73.1). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Page if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight. The single most decisive one: Weight — 45.00 g less. 195 vs 240.
Pick the Sage if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are screen size, waterproof. The single most decisive one: Screen size — 14.29% more. 8 " vs 7 ".
Both ship with comparable resolution, storage, color screen, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Boox - Page or Kobo - Sage?
Kobo - Sage leads the current Mars Score by 1.4 points.The more useful decision is the trade-off behind that result: compare screen size, weight against the way you will actually use the product.
Choose Boox - Page if…
Boox - Page has the measurable edge on weight g.
Choose Kobo - Sage if…
Kobo - Sage has the measurable edge on screen size in, 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 - Page wins
- ▲Weight — 45.00 g less. 195 vs 240.
Why Kobo - Sage wins
- ▲Screen size — 14.29% more. 8 " vs 7 ".
- ▲Has Waterproof.
Spec comparison
Display
| Spec | Boox - Page | Kobo - Sage |
|---|---|---|
| Screen size | 7 " | 8 "lead |
| Resolution | 300 ppi | 300 ppi |
| Color screen | false | false |
| Warm light | true | true |
Design
| Spec | Boox - Page | Kobo - Sage |
|---|---|---|
| Weight | 195 glead | 240 g |
| Waterproof | false | truelead |
| Page-turn buttons | true | true |
Storage & Battery
| Spec | Boox - Page | Kobo - Sage |
|---|---|---|
| Storageⓘ | 32 GB | 32 GB |
| Battery life | 4 weeks | 8 weekslead |