Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Logitech - MX Keys S | NuPhy - Air75 V2 |
|---|---|---|
| Hot-swappable | false | true |
| Size | Full | 75% |
Between the MX Keys S and Air75 V2, the MX Keys S comes out ahead in size, while the Air75 V2 wins on hot-swappable. Overall, the MX Keys S scores 38.3 and the Air75 V2 scores 64.5 on our Mars Score.
Which should you buy?
The Air75 V2 is the clear pick on raw spec strength, leading by 26.2 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 MX Keys S if you care most about size. The biggest gaps in its favor are size. The single most decisive one: Size: Full (vs 75%).
Pick the Air75 V2 if you care most about hot-swappable. Its strongest claims are hot-swappable. The single most decisive one: Has Hot-swappable.
Both ship with comparable wireless, polling rate, rotary knob, so those specs do not separate the two — focus on the differences below.
Bottom line: the Air75 V2 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: Logitech - MX Keys S or NuPhy - Air75 V2?
NuPhy - Air75 V2 leads the current Mars Score by 26.2 points.The more useful decision is the trade-off behind that result: compare size, hot-swappable against the way you will actually use the product.
Choose Logitech - MX Keys S if…
Logitech - MX Keys S has the measurable edge on size.
Choose NuPhy - Air75 V2 if…
NuPhy - Air75 V2 has the measurable edge on is hot swap.
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 Logitech - MX Keys S wins
- ▲Size: Full (vs 75%).
Why NuPhy - Air75 V2 wins
- ▲Has Hot-swappable.
Spec comparison
Switches
| Spec | Logitech - MX Keys S | NuPhy - Air75 V2 |
|---|---|---|
| Switch type | Scissor | Gateron Low-profile |
| Hot-swappable | false | truelead |
Layout & Build
| Spec | Logitech - MX Keys S | NuPhy - Air75 V2 |
|---|---|---|
| Size | Fulllead | 75% |
| RGB | false | truelead |
| Rotary knob | false | false |
| Case material | Plastic | Aluminum + Plastic |
Connectivity
| Spec | Logitech - MX Keys S | NuPhy - Air75 V2 |
|---|---|---|
| Wireless | true | true |
| 2.4 GHz | false | truelead |
| Battery | 240 hlead | 120 h |
| Polling rate | 1000 Hz | 1000 Hz |