Coros Pace 4 Pro review

I haven't worn the Pace 4 Pro. This is my reading of published tests, checked on 3 November 2026, and they mostly agree on the shape of it: the GPS is good, the heart rate is fine until you ask a lot of it, and the GPS battery isn't yet what Coros claims.

£389 on coros.com (UK), checked 3 November 2026.

The Pace 4 sits at £229 on the same store, checked the same day, and, according to The Run Testers, has all the same software features. So the Pro's extra money buys design, screen and battery. Nothing below changes how the watch trains you.

All of this is independent, non-peer-reviewed field testing. I found no peer-reviewed study of this watch or of Coros's new sensor.

GPS: the strong part

DC Rainmaker ran it on road and trail, and rode with it. His trail run in the High setting came out virtually identical to a Fenix 9 Pro, and it stayed on the path where an Amazfit Dual Solar wandered into the bushes.

His one mark against it is small and a little odd. On repeated street loops it sat on the wrong side of the road, every lap. His conclusion is "perfectly functional GPS accuracy", which is less gushing than the other reviews.

Tom's Guide put it in line with top Garmin watches in multi-band mode. The Run Testers said tracks stayed with rivals on the twisting Shoreditch Half Marathon course. Tom's Guide's reviewer also founded The Run Testers, so read those as one voice.

These are all track overlays and judgement, with no error percentage. I can't give you one. Independent figures for multi-band on current watches are thin, and I go through why in multi-band GPS explained.

Heart rate: the questioned part

Here the reviews split, though less than the headlines suggest.

DC Rainmaker's verdict is the one I'd keep: improved on the last generation, but rivals are improving faster, and Coros stays "at the upper end of the mid-tier". He also makes a fair point on those trainer intervals. Over 30 seconds your heart lags your effort anyway, so pace or power is the number to train by.

The5krunner reported "some issues" with the new sensor in its September article and said its detailed figures were due in early November. None had appeared by 3 November, so that test is missing here. Its FAQ also cites unnamed independent tests finding heart rate prone to cadence lock and weak in strength training.

There are no bpm bias figures for this watch in anything I read. So I'm calling this qualitative evidence, and scoring it that way.

My advice is simple. If you train by heart rate in intervals, buy a strap as well. It pairs over Bluetooth only, with no ANT+ listed, and my chest strap guide covers the setup. The Polar H10 review explains why researchers trust that one.

A tracker isn't a medical device. Treat these readings as estimates for general fitness, and talk to a clinician about symptoms or concerns.

Battery: claim against measurement

Coros claims 40 h, All systems, dual-frequency.

DC Rainmaker quotes a claim of 30 h with the screen always on and Max GPS, and says he's consistently under 20 h, sometimes in the low 20s. Coros told him a GPS bug may be behind it on runs. On rides, it blames Bluetooth sensor scanning at every stop. It promised an update in November.

I couldn't confirm that update has landed as of this check. DC Rainmaker also warns that GPS battery fixes usually involve a trade-off, so don't assume the accuracy above survives unchanged.

Daily life looks better, and here the testers differ. DC Rainmaker saw 4 to 6 days with 1 to 2 hours of GPS workouts a day. Tom's Guide got just over seven days on its first charge with an always-on screen and daily runs.

For a marathon, even the low figure is plenty. For a long ultra, I'd wait for the fix and a retest.

Training features

Tom's Guide says the app has plans for a wide range of running events and time goals, with some for cycling and triathlon, and it sends workouts to the watch. There's no readiness score. You get overnight heart-rate variability instead.

DC Rainmaker points out nothing here is new: the sport software matches other recent Coros watches. Good if you like Coros's approach. It's also why the Pro is hard to justify on training grounds alone.

I found no independent test of its VO2max estimate or race predictor on this model. Treat both as trends.

Should you buy it

Buy it if you want a big, bright screen and long battery in a thin watch, and you'll use a strap for key sessions. Weight is 51 g, Silicone band; 43 g nylon.

If the screen doesn't matter to you, the same software costs less on the Pace 4. I weigh that cheaper watch against Garmin in Forerunner 170 vs Coros Pace 4, and the marathon goal page has the rest of the field.