Two low-profile keyboards compared. The MX Keys S is membrane, the K3 is mechanical low-profile.
The Keychron K3 offers mechanical switches and hot-swappability for $61 less. Great value for mechanical keyboard fans.
The Keychron K3 wins this one for mechanical-keyboard fans: low-profile mechanical switches and hot-swap at $61 less than the MX Keys S. The MX Keys S is the better buy only if quiet typing, instant multi-device switching, and Logitech's Flow ecosystem matter more to you than mechanical feel.
Logitech MX Keys S: The MX Keys S is a quiet scissor membrane.
Keychron K3: The K3 is low-profile mechanical and hot-swappable.
When this matters: Decides it for anyone who wants mechanical feel.
Logitech MX Keys S: The MX Keys S costs $140.
Keychron K3: The K3 at $79 delivers mechanical switches for $61 less.
When this matters: A large gap for a keyboard.
Logitech MX Keys S: The MX Keys S switches devices instantly and quietly.
Keychron K3: The K3's Bluetooth works but is less polished.
When this matters: Matters for Mac-plus-PC workflows.
| Spec | Logitech MX Keys S | Keychron K3 |
|---|---|---|
| Price | $140 | $79 |
| Switch Type | Membrane | Mechanical (low-profile) |
| Hot-Swappable | No | Yes |
| Battery | 15 days | 5-7 days |
| Noise Level | Quiet | Moderate |
Quiet-office, multi-device users who want Logitech's polish.
If you want mechanical tactility, you are overpaying for the MX Keys S.
Mechanical-keyboard fans who want low-profile feel at a value price.
If you need near-silent typing in a shared room, the K3's switches will be heard.
This comparison was built from a structured review of official product documentation, published specifications, current pricing, and feature documentation — the same methodology ToolStep describes on the /how-we-test/ page. Because we did not run these products hands-on, we do not claim testing that did not happen.
Based on official product documentation as of June 2026.
The Logitech MX Keys S is quieter and better suited for shared office spaces. The K3 mechanical switches produce audible clicks.