A mouse that makes your workday easier

I’ve used the MX Master line since the original in 2015. Every iteration has been incremental. The MX Master 4 is the first one where the increment actually matters in daily use.

What’s new (and what isn’t)

The MX Master 3S was already an excellent mouse. The MX Master 4 adds:

• Haptic side button feedback — when you tap the thumb button, you feel a subtle vibration. Sounds gimmicky; in practice, it makes the button feel intentional and reduces mis-clicks. Big deal.
• Quieter clicks — the click noise is genuinely softer, which matters in open offices.
• Improved sensor — 8K DPI vs the 3S’s 4K. Useful for high-DPI 5K displays.
• Slightly lighter — 142g vs 145g. You feel this if you move the mouse a lot.

What’s not new: the free-spin scroll wheel (still best-in-class), the Flow multi-device switching, the 70-day battery life, the USB-C charging.

The haptic button in practice

I was skeptical. Then I used it for a week. Now when I go back to my old MX Master 3S at the office, I mis-click the thumb button constantly because there’s no haptic confirmation.

It’s the kind of feature you didn’t know you needed until you tried it.

The complaints

1. Price. $99 is consistent with the 3S launch but still feels like a lot for a mouse. You can get a perfectly serviceable Logitech mouse for $30. The MX Master 4 is $99 because the engineering and build quality justify it — but I’d buy it on sale, not at MSRP.

2. Right-handed only. Left-handed productivity mouse users are still out of luck. Logitech’s left-handed offerings are basic. If you’re left-handed, the Razer Pro Click Mini is the closest alternative.

3. Cable is short. The included USB-C charging cable is 1m. Useful for travel, less useful for charging at your desk with a tower underneath. Buy a longer cable or charge overnight.

Who should buy

Yes:

• You use a computer 6+ hours a day
• You’re on multiple devices (Mac + Windows, or Mac + iPad)
• You scroll a lot (the free-spin wheel is unmatched)

No:

• You’re a casual user (the $30 Logitech M750 is fine)
• You game (Razer / SteelSeries have lower-latency options)
• You’re left-handed (see above)

Verdict

The MX Master 4 is the productivity mouse to beat in 2026. The haptic button justifies the upgrade from the 3S. The price is steep but the longevity is real — my 3S is four years old and still works.

If you spend your days on a computer, this is the mouse to buy.