Logitech MX Master 4 vs. Logitech MX Master 3S Compared

What actually differs

The Logitech MX Master 4 replaces the Logitech MX Master 3S as Logitech’s flagship productivity mouse 12. Engadget and The Gadgeteer, which both tested it against the older mouse, call the update iterative rather than a redesign 34. Engadget’s review states that the MX Master 4’s shape, rated battery life, sensor resolution and click noise all carry over from the MX Master 3S; The Gadgeteer, comparing the two directly, disagrees on click noise, reporting the MX Master 4’s main buttons are quieter than the 3S’s 34. The Gadgeteer’s reviewer has used a Logitech MX mouse daily since an MX700 more than two decades ago, and concludes that “the MX Master 4 feels like a small, smart improvement rather than a total overhaul” 4. Most of what’s cited below reviewed only one of the two mice, so the sections that follow separate what a source actually measured or compared from what one outlet said about a single product on its own.

Weight and size

The Logitech MX Master 4 weighs more than the Logitech MX Master 3S on paper. Logitech’s spec sheet lists the MX Master 4 at 150 g, and RTINGS measured 151.8 g on its own unit 56. Logitech’s spec sheet lists the MX Master 3S at 141 g, a figure TechGearLab measured independently and RTINGS confirmed at 141.2 g on its own unit 781. Engadget, which reviewed the MX Master 4 against the MX Master 3S directly, reports that the newer mouse is slightly heavier, wider and taller, with larger main click buttons 3. Console Creatures, which cites the same Logitech figures, calls the roughly 9 g gap too slight to notice; Engadget, which handled both, says anyone comfortable with the MX Master 3S “should have few issues here” 39. PCWorld and NotebookCheck each list the MX Master 4’s weight as a drawback on its own terms, without reference to the older mouse 1011. RTINGS raises the MX Master 3S’s 141 g as a problem only in its gaming coverage, not its office-use verdict 1, while Digital Trends does both: it lists being too heavy for some among its cons and wishes the mouse were “a tad lighter” in general, and separately found it too heavy when it tried the mouse in a game 12. Winner: the MX Master 3S, on the spec sheets — Console Creatures calls the roughly 9 g gap negligible in practice, though PCWorld and NotebookCheck still count the MX Master 4’s weight against it on its own 91011.

Buttons, gestures and the haptic Action button

Button counts favor the Logitech MX Master 4, and the extra button carries a feature the Logitech MX Master 3S doesn’t have at all. Logitech’s MX Master 4 for Business listing counts 8 buttons on the MX Master 4 2, while Logitech’s spec sheet counts 7 on the MX Master 3S 7. RTINGS, which has reviewed both mice, describes the MX Master 4 as adding larger click buttons, a new gesture side button and a haptic thumb button over the MX Master 3S, while replacing the 3S’s soft-touch rubber coating with textured plastic and silicone for durability 1. That haptic button opens a customizable Actions Ring, and the reviewers who tried it are split: How-To Geek’s reviewer calls it “one small update that changed my entire workflow” after reprogramming it for macOS window management 13, while The Gadgeteer’s reviewer finds the Action button and Actions Ring cool but doesn’t use them, preferring existing keyboard macros and tools like Raycast 4. Console Creatures lists the haptic feedback as a plus while calling it gimmicky but nice, and wishes it extended further into browser use 9. Winner: the MX Master 4, for anyone who wants the extra button. The outlets that used the haptics split on how much they pay off rather than on whether they work: How-To Geek reprogrammed the button and calls the change substantial, Console Creatures calls the feedback gimmicky but nice and NotebookCheck calls it innovative, and The Gadgeteer left the feature unused 139114.

Scroll wheels

Logitech’s MX Master 4 for Business listing lists MagSpeed wheels for both the MX Master 4 and the MX Master 3S for Business 2, and no outlet that reviewed both puts a number on which one scrolls better. On the Logitech MX Master 4, RTINGS lists the primary wheel’s ability to switch automatically or manually between notched and free-spin modes among its pros 6, PCWorld credits “Superb scroll wheel with adjustable resistance” 10, and The Gadgeteer names a smooth scroll wheel among its own strengths 4. On the Logitech MX Master 3S, Tom’s Hardware lists the wheel’s magnetic switch between smooth and ratchet modes as a pro 14, and Tom’s Guide separately calls it a “Lovely scroll wheel” 15. The only quantified wheel score in the record comes from TechGearLab, which rated the MX Master 3S’s wheel 7.2 out of 10, noting the main wheel is a bit harder to click and the horizontal wheel carries noticeably more resistance than the main one 8; RTINGS’ numeric scores for the MX Master 4 sit behind a membership, so there’s nothing to set that figure against 6. Winner: no source settles it, and neither wheel is flawless. PCWorld lists the MX Master 4’s wheel as feeling “a little loose in free position” 10, while on the MX Master 3S How-To Geek reports an occasionally imprecise ratchet mode and Tom’s Guide wished the main wheel’s ratchet weighting were adjustable 1615. What stays unresolved is narrower than a general verdict: no outlet scores the two wheels against each other, and the one published wheel score has no counterpart 86.

Comfort and hand size

Comfort claims split by hand size, not by model, since most of what’s cited below covers only one of the two mice. Digital Trends, whose reviewer came from PC gaming mice like the Logitech G502, rates the Logitech MX Master 3S as more comfortable than any mouse used before, citing its 84.3 mm width as ideal for very large hands 12. Reviewed.com’s reviewer used the MX Master 3S for 10 to 12 hours a day across office work, creative writing and light gaming without hand fatigue 17. RTINGS says the MX Master 3S runs large and isn’t well suited to smaller hands 1, and RTINGS and Engadget separately reach the same conclusion about the Logitech MX Master 4 63. TechGearLab, by contrast, rated the MX Master 3S’s comfort 8.6/10 across hand sizes and calls it comfortable regardless of hand size, noting only that it may feel “just a smidge big” for smaller hands 8. Neither shape supports left-handed use: TechRadar and Tom’s Guide list the MX Master 3S’s right-handed-only design as a con 1815, and Engadget separately says the MX Master 4 isn’t for lefties either 3. Engadget, which handled both mice, says the MX Master 4’s shape carries over from the MX Master 3S 3, and The Gadgeteer’s side-by-side comparison found the layout change too subtle to call a redesign 4. Winner: tie, with a caveat. Four outlets compared the two shapes: Engadget lists the general shape as carried over, The Gadgeteer found the change too subtle to call a redesign, and How-To Geek says the overall feel is “mostly unchanged, though the layout is slightly different” 3413. RTINGS is the dissenter, recording subtle refinements on the MX Master 4 including larger click buttons and an expanded palm rest 1. The hand-size and handedness limits are the same on both: RTINGS marks small hands against each mouse, Engadget says the MX Master 4 isn’t for lefties, and TechRadar says the same of the MX Master 3S 61318.

Sensor, tracking and connectivity

On paper, the sensors are identical: both spec sheets list a 200–8,000 DPI Darkfield sensor 57. Connectivity differs only in the receiver. Both mice pair over Bluetooth Low Energy, but Logitech’s MX Master 4 for Business listing shows a Logi Bolt USB-C receiver for the MX Master 4 against a Logi Bolt USB-A receiver for the MX Master 3S for Business 572; TechRadar independently confirms the consumer MX Master 3S also ships with a USB-A Logi Bolt receiver 18. Engadget confirms the Windows MX Master 4’s receiver switched from USB-A to USB-C 3. Both product pages also claim glass tracking, qualified on the Logitech MX Master 3S page to a 4 mm minimum glass thickness 1920, and each claim was confirmed independently rather than compared directly: PCWorld found the Logitech MX Master 4’s sensor tracks accurately on almost any surface, including glass, with immediate response 10, and TechGearLab found the Logitech MX Master 3S tracked on a clear glass table when no other mouse in its comparison group could 8. TechRadar’s review of the MX Master 3S notes that most users are unlikely to need the full 8,000 DPI range, which is aimed at creative professionals working on 5K or 8K monitors 18. Winner: tie on the sensor and glass tracking. The receiver connector is the one real difference, and Engadget counts the MX Master 4’s switch to USB-C among its minor upgrades 3.

Gaming and polling rate

Neither mouse is built for competitive gaming, and RTINGS is the only outlet on record that tested both for it, in two separate write-ups rather than a head-to-head. RTINGS found the Logitech MX Master 4 satisfactory for casual gaming but not designed for FPS titles, citing its weight and higher click and sensor latency versus dedicated gaming mice, and names its polling rate as a locked 125 Hz, matching Logitech’s own spec 65. Its review of the Logitech MX Master 3S reaches a similar verdict — adequate for FPS and decent for MMO play — citing the mouse’s weight, only-decent click latency and a low, fixed polling rate, though that review gives no number for it, and no other source in the record does either 1. Console Creatures separately calls the MX Master 4’s polling rate acceptable for general productivity work, noting dedicated gaming mice offer far higher rates 9. Winner: no source gives a numeric figure for the Logitech MX Master 3S’s polling rate, so that comparison stays unresolved — but RTINGS’ separate verdicts land the two mice in the same place for gaming: usable casually, not competitive.

Battery life and charging

Logitech rates both mice at up to 70 days per charge, so the manufacturer numbers are a tie 58. No outlet tested both mice’s batteries side by side, so the real-world figures below are separate data points, not a comparison. Console Creatures measured about a 5% charge drop over three weeks of typical use on the Logitech MX Master 4 9. On the Logitech MX Master 3S, Reviewed.com saw an 8% drop over a week of mixed use 17, TechRadar’s unit stayed above 50% after nearly a month 18, and Tom’s Guide estimates about four weeks of real-world battery life from its own drain rate 15, against Logitech’s 70-day rating 8. Both mice also share the same fast-charge spec: Logitech’s page and NotebookCheck both give the Logitech MX Master 4 one minute of charging for three hours of use 511, the same figure Logitech’s page states for the Logitech MX Master 3S 7. Console Creatures, however, puts that same three hours of charge at ten minutes of charging rather than one, a figure at odds with both Logitech’s and NotebookCheck’s 9. Winner: tie. The published battery ratings and most fast-charge figures match 58, and nothing in the record suggests one mouse holds a charge meaningfully better than the other.

Price

The Logitech MX Master 3S costs less, and that’s arithmetic rather than opinion. Logitech’s own store lists the Logitech MX Master 4 at $119.99 as of September 2026 19, while its Logitech MX Master 3S page lists a struck-through $99.99 MSRP as of September 2026; that page rendered as the discounted Bluetooth Edition variant, selling for $89.99, rather than the standard Bolt-receiver edition this page covers 20. How-To Geek, reviewing the MX Master 4 against the outgoing model, notes it costs $20 above the previous generation at launch 13. TechGearLab’s own MX Master 3S review is inconsistent about the exact figure, listing it at $100 in a comparison table and at $120 later in the same article’s buying advice 8, but Logitech’s current list prices for both models settle the comparison regardless. Winner: the Logitech MX Master 3S, on price.

Which one to buy

Buyers who already own a Logitech MX Master 3S have two outlets on record recommending they stay put unless a specific feature matters to them 134. How-To Geek suggests skipping the upgrade unless you specifically want the new Action button or haptic feedback, reserving its recommendation for anyone coming from an MX Master 2S or older 13. The Gadgeteer, comparing the two directly, agrees there’s no strong reason to upgrade unless the haptic Actions Ring appeals, since it found the change more incremental than not 4. For a first-time buyer choosing between the two, the decision comes down to what the sections above actually settled: the Logitech MX Master 3S is lighter and cheaper, with the same sensor, the same 70-day battery rating Logitech claims for both mice, and connectivity that differs only in receiver connector 7582; the Logitech MX Master 4 adds a haptic Action button feeding its Actions Ring, a feature some reviewers value highly and others ignore entirely 134. Neither mouse suits left-handed buyers or competitive gamers: Engadget says the MX Master 4 isn’t for lefties, TechRadar says the same of the MX Master 3S, and both mice draw complaints about running large for small hands 3186. Nothing in the record supports one overall winner: the two mice split on price and weight toward the Logitech MX Master 3S, and on the extra button and haptic feedback toward the Logitech MX Master 4, with everything else too close, or too separately tested, to call.