Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Logitech - MX Keys S | Logitech - PRO X TKL RAPID |
|---|---|---|
| Polling rate | 1000 Hz | 8000 Hz |
| Size | Full | TKL |
| Wireless | true | false |
Between the MX Keys S and PRO X TKL RAPID, the MX Keys S comes out ahead in size / wireless, while the PRO X TKL RAPID wins on polling rate. Overall, the MX Keys S scores 38.3 and the PRO X TKL RAPID scores 56.6 on our Mars Score.
Which should you buy?
The PRO X TKL RAPID is the clear pick on raw spec strength, leading by 18.3 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 / wireless. The biggest gaps in its favor are size, wireless. The single most decisive one: Size: Full (vs TKL).
Pick the PRO X TKL RAPID if you care most about polling rate. Its strongest claims are polling rate. The single most decisive one: Polling rate — 700.00% more. 8000 Hz vs 1000 Hz.
Both ship with comparable hot-swappable, rotary knob, so those specs do not separate the two — focus on the differences below.
Bottom line: the PRO X TKL RAPID 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 Logitech - PRO X TKL RAPID?
Logitech - PRO X TKL RAPID leads the current Mars Score by 18.3 points.The more useful decision is the trade-off behind that result: compare size, wireless 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, is wireless.
Choose Logitech - PRO X TKL RAPID if…
Logitech - PRO X TKL RAPID has the measurable edge on polling rate hz.
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 TKL).
- ▲Wireless: true (vs false).
Why Logitech - PRO X TKL RAPID wins
- ▲Polling rate — 700.00% more. 8000 Hz vs 1000 Hz.
Spec comparison
Switches
| Spec | Logitech - MX Keys S | Logitech - PRO X TKL RAPID |
|---|---|---|
| Switch type | Scissor | GX Optical Linear Hall-effect |
| Hot-swappable | false | false |
Layout & Build
| Spec | Logitech - MX Keys S | Logitech - PRO X TKL RAPID |
|---|---|---|
| Size | Fulllead | TKL |
| RGB | false | truelead |
| Rotary knob | false | false |
| Case material | Plastic | Aluminum |
Connectivity
| Spec | Logitech - MX Keys S | Logitech - PRO X TKL RAPID |
|---|---|---|
| Wireless | truelead | false |
| 2.4 GHz | false | false |
| Battery | 240 hlead | 0 h |
| Polling rate | 1000 Hz | 8000 Hzlead |