Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Logitech - MX Keys S | Royal Kludge - RK R98 Pro |
|---|---|---|
| Hot-swappable | false | true |
| Rotary knob | false | true |
| Size | Full | 96% |
Between the MX Keys S and RK R98 Pro, the MX Keys S comes out ahead in size, while the RK R98 Pro wins on hot-swappable / rotary knob. Overall, the MX Keys S scores 38.3 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 42.8 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 96%).
Pick the RK R98 Pro if you care most about hot-swappable / rotary knob. Its strongest claims are hot-swappable, rotary knob. The single most decisive one: Has Hot-swappable.
Both ship with comparable 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: Logitech - MX Keys S or Royal Kludge - RK R98 Pro?
Royal Kludge - RK R98 Pro leads the current Mars Score by 42.8 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 Royal Kludge - RK R98 Pro if…
Royal Kludge - RK R98 Pro has the measurable edge on is hot swap, has knob.
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 96%).
Why Royal Kludge - RK R98 Pro wins
- ▲Has Hot-swappable.
- ▲Has Rotary knob.
Spec comparison
Switches
| Spec | Logitech - MX Keys S | Royal Kludge - RK R98 Pro |
|---|---|---|
| Switch type | Scissor | RK Cream Yellow |
| Hot-swappable | false | truelead |
Layout & Build
| Spec | Logitech - MX Keys S | Royal Kludge - RK R98 Pro |
|---|---|---|
| Size | Fulllead | 96% |
| RGB | false | truelead |
| Rotary knob | false | truelead |
| Case material | Plastic | Plastic |
Connectivity
| Spec | Logitech - MX Keys S | Royal Kludge - RK R98 Pro |
|---|---|---|
| Wireless | true | true |
| 2.4 GHz | false | truelead |
| Battery | 240 hlead | 150 h |
| Polling rate | 1000 Hz | 1000 Hz |