COROS PACE 4 vs PACE Pro

The specification table

Every value below is COROS's own published figure, from its PACE 4 and PACE Pro product pages and the two launch releases. Where COROS does not publish something, the row says so rather than borrowing a number from the other watch.

The battery rows are not the same mode, and that is the whole trick

The headline reads 41 hours against 38 and looks like a clean win for the cheaper watch. It is not a like-for-like row. COROS's 41-hour figure for the PACE 4 is an All-Systems number, and COROS publishes no dual-frequency battery figure for the PACE 4 at all. For the PACE Pro it publishes both: 38 hours of GPS activity tracking and 31 hours in dual-frequency mode.

Dual-frequency is the mode you bought a dual-frequency receiver for. It is the setting that helps in city streets and under tree cover, which is the specific failure most people are trying to fix when they shop for a new running watch. So the only watch here that tells you what accurate positioning costs in battery terms is the older, dearer one.

That is why this site carries 31 hours as the PACE Pro's endurance number rather than the flattering 38 — the same rule we apply to the Garmin Instinct 3, where we carry the multi-band figure rather than the 40-hour GPS-only headline. The consequence is visible in the arithmetic: the PACE 4 comes to $6.07 per stated All-Systems GPS hour, and the PACE Pro to $9.65 per stated dual-frequency hour. Those two numbers are not measuring the same thing, and we would rather say that than print a tidy comparison that is quietly wrong.

Maps are the only row that decides anything

Strip the battery modes out and one genuine capability separates these watches. COROS states that the PACE Pro carries global maps with turn-by-turn navigation. On the PACE 4 page, what COROS describes is route sync from Strava, RidewithGPS and Wikiloc plus breadcrumb navigation — a line to follow, not a map to read. It does not claim global maps anywhere we could find.

The difference matters in exactly one situation and is irrelevant in every other. If you leave a route you loaded, breadcrumb navigation can tell you that you have left it and roughly where the line is; it cannot show you the trail you are standing on or route you back onto it. If you run known roads, or you always start a loaded route and finish it, the PACE 4's navigation is enough and the map is dead weight you paid for.

We wrote a whole page on this question rather than settling it in a paragraph: do you need maps on a running watch works through when the answer is genuinely yes. Read it before spending the difference, because for most road runners the honest answer is no.

The newer watch is the cheaper watch, which is unusual

COROS launched the PACE Pro on 31 October 2024 at $349 and the PACE 4 on 10 November 2025 at $249. The PACE 4 is a full year newer, a hundred dollars cheaper at launch, five grams lighter, thinner at a published 11.8 mm, and it is the one with the redesigned heart-rate sensor. Normally the newer, cheaper model is the cut-down one. Here it is not: it beats the Pro on weight, on stated GPS hours in its own mode, and on price.

What the "Pro" in the name is actually buying, on COROS's own published figures, is a bigger and brighter screen — 1.3 inches at 1500 nits with an always-on option — a named processor in the Ambiq Apollo510, SpO2, and the maps. It is not buying a better sensor or a longer battery.

Watch the live prices before you conclude anything from the launch numbers. Both have moved since release, and the current gap is $50. The prices on this page are the ones the arithmetic above is computed from, and they came from Amazon rather than from memory.

The evidence position is identical, and it is empty

Neither of these watches has been independently measured. Not the heart rate, not the positioning, not the sleep staging. The only measured COROS result anyone has published that we could find is the5krunner's 10-mile comparison of the PACE 3, against a Garmin HRM-Pro Plus and a Polar Verity Sense, which found the watch's wrist heart rate diverged during and after rapid intensity change — and whose author explicitly cautioned that the dataset was limited.

That test is about a third watch. It is not evidence for or against either of these two, and we are not going to launder it into one by implication. What it does establish is that the one time somebody in this category actually measured a COROS optical sensor, the result was unflattering, and nobody has repeated the exercise on anything COROS has released since. COROS says the PACE 4's sensor was redesigned with larger LEDs. That is a manufacturer claim, it is labeled as one throughout this site, and it remains untested.

This is why both watches score 4.5 out of 10 on evidence and cannot rank higher here regardless of their hardware. It is also why the single most useful thing you can do with either of them is not a watch at all: pair a chest strap. Both accept external sensors over Bluetooth, and doing that replaces the one component in this comparison with a documented problem with the one that published studies use as their reference.

Where each watch actually wins

• Weight. PACE 4, 32 g against 37 g on the same nylon band. Over four hours you notice it; over one you do not.
• Screen. PACE Pro. 1.3 inches, 1500 nits, always-on if you want it — at the cost of dropping from 20 stated days to 6.
• Stated GPS hours in its own best mode.PACE 4, 41 All-Systems hours against the Pro's 38.
• Telling you what the accurate mode costs. PACE Pro, and only the PACE Pro. 31 published dual-frequency hours against a blank.
• Navigation. PACE Pro, decisively. Global maps and turn-by-turn against breadcrumbs.
• Heart-rate hardware. PACE 4 on paper, with a sensor COROS describes as redesigned. Neither on evidence, because there is none.
• Price per hour of the mode you would race in.Not computable for the PACE 4, because COROS does not publish that mode's battery figure.

So which one

Buy the PACE 4 if you run roads, tracks, treadmills or routes you already know. It is newer, lighter, cheaper and states more hours, and nothing the PACE Pro adds changes a number either watch records.

Buy the PACE Proif you go somewhere you might get lost, or if you want the always-on screen and have read the battery cost of it. Buying it for the "Pro" badge alone is buying a spec sheet the cheaper watch already beats.

Buy neither yet if wrist heart rate during intervals is the thing you are trying to fix. Fix that with a strap first — see the heart-rate upgrade path — and then buy whichever of these two suits the running you actually do.