Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | NuPhy - Air75 V2 | Royal Kludge - RK R98 Pro |
|---|---|---|
| Rotary knob | false | true |
| Size | 75% | 96% |
Between the Air75 V2 and RK R98 Pro, the Air75 V2 comes out ahead in several specs, while the RK R98 Pro wins on rotary knob / size. Overall, the Air75 V2 scores 64.5 and the RK R98 Pro scores 81.1 on our Mars Score.
Which should you buy?
The RK R98 Pro is the clear pick on raw spec strength, leading by 16.6 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.
The Air75 V2 does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the RK R98 Pro if you care most about rotary knob / size. Its strongest claims are rotary knob, size. The single most decisive one: Has Rotary knob.
Both ship with comparable hot-swappable, wireless, polling rate, so those specs do not separate the two — focus on the differences below.
Bottom line: the RK R98 Pro 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: NuPhy - Air75 V2 or Royal Kludge - RK R98 Pro?
Royal Kludge - RK R98 Pro leads the current Mars Score by 16.6 points.The more useful decision is the trade-off behind that result: compare size against the way you will actually use the product.
Choose NuPhy - Air75 V2 if…
NuPhy - Air75 V2 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Royal Kludge - RK R98 Pro if…
Royal Kludge - RK R98 Pro has the measurable edge on has knob, size.
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 NuPhy - Air75 V2 wins
- No decisive advantages.
Why Royal Kludge - RK R98 Pro wins
- ▲Has Rotary knob.
- ▲Size: 96% (vs 75%).
Spec comparison
Switches
| Spec | NuPhy - Air75 V2 | Royal Kludge - RK R98 Pro |
|---|---|---|
| Switch type | Gateron Low-profile | RK Cream Yellow |
| Hot-swappable | true | true |
Layout & Build
| Spec | NuPhy - Air75 V2 | Royal Kludge - RK R98 Pro |
|---|---|---|
| Size | 75% | 96%lead |
| RGB | true | true |
| Rotary knob | false | truelead |
| Case material | Aluminum + Plastic | Plastic |
Connectivity
| Spec | NuPhy - Air75 V2 | Royal Kludge - RK R98 Pro |
|---|---|---|
| Wireless | true | true |
| 2.4 GHz | true | true |
| Battery | 120 h | 150 hlead |
| Polling rate | 1000 Hz | 1000 Hz |