Bottom line: The upgrade is a screen, and the screen costs you battery. The COROS PACE 4 adds an AMOLED display at $249. The PACE 3 keeps a transflective one at $199 and lasts five days longer per charge as a result. Both already have dual-frequency GPS. If you want a watch that looks modern, pay the $50. If you want the longest battery in this class and the best screen in bright sun, the older cheaper one is genuinely the better watch.
Check COROS PACE 4 Price → Check COROS PACE 3 Price →
Specifications and prices below were read from COROS’s own Amazon listings in July 2026. Both were in stock at the time, which is worth noting because COROS availability on Amazon can be intermittent.
The Numbers, Side by Side
| PACE 4 | PACE 3 | |
|---|---|---|
| Price | $249 | $199 |
| Display | 1.2in AMOLED | 1.2in transflective, always-on |
| Resolution | 164% higher than PACE 3 | Baseline |
| Daily battery | Up to 19 days | Up to 24 days |
| Continuous GPS | 41 hours | 38 hours |
| Weight (nylon band) | 32g | 30g |
| Thickness | 11.8mm | 11.7mm |
| Dual-frequency GPS | Yes | Yes |
Read that table and the story is not what a successor launch usually looks like. The newer watch is heavier, thicker, more expensive, and has worse daily battery life. It wins on screen quality and on GPS endurance during a single very long effort. Everything else is a wash or a mild regression.
Why the Older Watch Lasts Longer: Two Different Display Technologies
This is the mechanism that explains the whole comparison, and almost no comparison bothers with it.
A transflective display, like the one on the PACE 3, reflects ambient light to show you the screen. It does not generate its own light in daylight. That means it can stay on permanently at near-zero power draw, and it gets more readable as sunlight gets brighter, which is precisely backwards from how phone screens behave. The trade is that it looks dim and washed out indoors, and needs a backlight in the dark.
An AMOLED display, like the one on the PACE 4, emits its own light from every pixel. Colours are vivid, blacks are genuinely black, and text is sharp in any lighting. The cost is power: every lit pixel drains the battery, which is why COROS rates the newer watch at 19 days of daily use against the older one’s 24.
So the five-day battery gap is not a manufacturing regression. It is the direct, unavoidable price of the upgrade you are paying for. Understanding that turns this from a confusing spec sheet into a simple question: do you want a nicer screen or a longer charge cycle?
See PACE 4 on Amazon → See PACE 3 on Amazon →
What the PACE 4 Genuinely Adds
Three things, and the first is the real one.
The screen. COROS states 164 percent higher resolution than the PACE 3 alongside the AMOLED panel and auto-adjusting brightness. On a watch you glance at mid-run, sharper text and better contrast is a daily quality-of-life improvement, not a spec-sheet flourish.
Longer continuous GPS. 41 hours against 38. That gap only matters if you are running events long enough to approach it, which means ultras. For a marathon it is irrelevant, since neither watch will come close to dying.
Voice recording. The PACE 4 adds a voice tool for capturing notes during a run. Genuinely useful if you coach yourself and want to record how a session felt while it is still fresh. Easy to ignore otherwise, and not worth $50 on its own.
What the PACE 3 Still Does Better
Battery, by a wide margin. 24 days of daily use versus 19 is the difference between charging roughly monthly and charging roughly every three weeks. If the appeal of COROS over Garmin was always the endurance, the older watch protects that better.
Bright-sun readability. This is underrated. A transflective screen in direct summer sunlight is easier to read than almost any AMOLED, because the brighter the environment gets, the better it looks. If most of your running is outdoors at midday, the PACE 3 display is arguably the superior tool.
Price. At $199 it undercuts the PACE 4 by $50 and undercuts most of the competition by far more. It is the value benchmark in the segment covered by our running watches under $200 roundup.
Dual-frequency GPS, already included. This is worth stating plainly because it is the spec people assume comes with the newer model. Both watches have it. You are not buying GPS accuracy by upgrading, and dual-frequency is the feature that genuinely matters if you run in cities or under tree cover, as we covered in our Polar Vantage M3 versus Garmin Forerunner 265 comparison.
How We Evaluate
We do not train with either watch and we will not imply we do. Every specification here comes from COROS’s own Amazon product listings, checked in July 2026, including the display types, the 164 percent resolution claim, the 19 and 24 day daily battery figures, the 41 and 38 hour GPS figures, and the weight and thickness numbers. Prices were read live on the same date and COROS stock on Amazon fluctuates, so confirm before buying. The explanation of how transflective and AMOLED displays differ in power draw reflects established display physics rather than either marketing claim. Where we recommend one watch over the other, that is our editorial judgment and it is labelled as such.
Who Should Buy Which
Buy the PACE 4 if screen quality is what has kept you away from COROS. That is a legitimate reason, because the older transflective panels genuinely look dated next to a modern AMOLED. Also buy it if you run ultras where the extra three hours of GPS matters, or if you want the newest hardware with the longest support runway.
Buy the PACE 3 if you want maximum battery, if you run mostly outdoors in daylight, or if $50 is better spent on shoes and a race entry. This is our pick for most runners, and the fact that it is the older cheaper model does not change that. It is also the better buy if you already own a PACE 3, because there is no capability upgrade here to justify replacing a working watch.
Consider neither if you want a deep training ecosystem with third-party integrations everywhere, where Garmin is stronger. Our Forerunner 265 review and running watch roundup cover that side, and our three-year cost breakdown covers what these all really cost once subscriptions are counted, which for COROS is nothing since there is no membership.
One last piece of advice that applies to both: if you train by heart rate zones, pair whichever you choose with a chest strap. Wrist optical sensors degrade exactly when intensity rises, which our guide to the validation research goes through, and our heart rate monitor roundup covers the fix.
Check COROS PACE 4 Price → Check COROS PACE 3 Price →
Which One Ages Better
Worth thinking about, because a running watch is a three-to-five year purchase for most people rather than an annual upgrade.
The PACE 4 is the current model, which means it sits earlier in its software support window and will receive feature updates for longer. COROS has a genuinely good record of pushing meaningful features to existing hardware rather than reserving them for new models, so that runway has real value.
Working the other way, AMOLED displays dim gradually over years of use while transflective panels do not degrade the same way, and battery capacity declines with charge cycles on both. Since the PACE 3 starts with roughly five more days of daily battery, it has more headroom to lose before the decline becomes annoying. A watch that starts at 24 days and drops to 18 is still excellent. One that starts at 19 and drops to 13 is closer to a weekly charge.
Neither consideration should override the screen question, which remains the actual decision. But if you keep watches until they die rather than trading up, the older model’s battery margin is a quiet advantage that spec sheets do not show.
FAQ
Is the COROS PACE 4 worth upgrading from the PACE 3?
For most people, no. The main upgrade is an AMOLED screen, and it costs you five days of daily battery life. Both watches already have dual-frequency GPS, and the weight and thickness are essentially identical. Upgrade for the display or do not upgrade.
Why does the older COROS PACE 3 have better battery life?
Display technology. The PACE 3 uses a transflective screen that reflects ambient light rather than generating its own, so it draws very little power. The PACE 4’s AMOLED emits light from every pixel, which looks far better and costs battery.
Does the COROS PACE 3 have dual-frequency GPS?
Yes. This is a common misconception about the upgrade. Both the PACE 3 and PACE 4 include dual-frequency satellite reception, so you do not gain GPS accuracy by buying the newer model.
Which COROS screen is better in sunlight?
The PACE 3’s transflective display, and it is not close. Transflective screens use ambient light, so they get more readable as sunlight gets brighter. AMOLED screens have to fight the sun with their own brightness.
Is the COROS PACE 4 better than a Garmin Forerunner?
It depends what you value. COROS wins decisively on battery life and price, and charges no subscription. Garmin wins on ecosystem breadth, third-party integrations, and training platform depth. Neither is universally better.