Boox - Note Air 4 C vs Kobo - Sage

The Note Air 4 C edges ahead on the Mars Score (77.7 vs 73.1), but the 4.6-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 Sage 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 — 180.00 g less. 240 vs 420.

Both ship with comparable resolution, 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.