The Logitech MX Keys S launched in 2024 as a revision of the original MX Keys released in 2019. At first glance the two keyboards look alike, but there are notable differences: the SMART ACTIONS button, more efficient backlight LEDs, and a slightly more understated design. Good news for repair: both models share 100% of their keys and scissor hinges — so if you have a broken key, you can order an MX Keys or MX Keys S key interchangeably.
Verdict
If you are buying new in 2026, get the MX Keys S for the SMART ACTIONS button and the Logi Bolt receiver. If buying refurbished or to save money, the 2019 MX Keys is still excellent at €30-40 less. For repair, both are mechanically identical.
FAQ
Is an MX Keys S key compatible with a 2019 MX Keys?
Yes 100%. Same scissor profile, same hinge, same printed character. You can safely mix and match.
Is the SMART ACTIONS button worth the €10 difference?
If you use Logi Options+ and create macros, yes. Otherwise it is just an extra modifier key. Save with the 2019 MX Keys if you are a casual user.
Which one for Mac?
Both exist in for Mac versions (MX Keys for Mac and MX Keys S for Mac). Same differences. For Mac, the S is recommended because SMART ACTIONS integrates well with Raycast and other macOS tools.