Apple Watch Series 9 Review: A Brilliant Smartwatch That Makes Small Trade-Offs for Runners

Introduction

The Apple Watch Series 9 arrives alongside the Apple Watch Ultra 2 as this year’s pair of new Apple watches, and both share a lot in common with their predecessors. With the Series 9, the updates are real but measured: a noticeably brighter display, a faster processor, and a few genuinely useful extras rather than a ground-up redesign.

After several weeks of testing, including plenty of running, the picture that emerges is of an outstanding smartwatch and a very good sports tracker, with a handful of trade-offs that matter more to some buyers than others.

What Has Changed With the Series 9

The headline hardware change is the screen. It now peaks at 2,000 nits instead of the 1,000 nits on the Series 8, and it can drop as low as one nit in always-on mode, which saves a little battery. The new S9 processor enables features like double tap, a gesture control that lets you interact with things like your Smart Stack and perform certain actions within apps without touching the screen.

There is also a new Ultra Wideband chip that makes Find My iPhone more precise, more recycled materials in the build, and a nice touch for the eco-conscious: an aluminium Series 9 paired with the Sport Loop is completely carbon neutral.

Beyond that, much is familiar. You get 41mm and 45mm case options, two side buttons including a rotating digital crown (but not the Action Button from the Ultra 2), the same third-generation heart rate sensor as the Series 8, ECG, skin temperature and blood oxygen readings, a barometric altimeter, and all-systems GPS tracking from multiple satellite systems. Note that it does not have multiband GPS, which is reserved for the Ultra line. Battery life sits at the familiar 18 hours, with a low power mode stretching that to 36 hours. And as always, the Apple Watch only works with iPhones. It is not compatible with Android devices.

One important caveat on double tap: it does not work in workout mode, because the heart rate monitor and accelerometer are already busy supporting your exercise tracking. That means you cannot double tap to take a lap, which is a shame for runners.

Sports Tracking: Strong, With a Few Gaps

As a sports tracker, the Series 9 punches well above its weight. Compared with other smartwatches, the native tracking is clearly ahead, with more customization, easier structured workouts, and of course access to the Apple App Store, which is full of high-quality sports apps that other platforms simply cannot match. For serious runners, this watch can cater to your needs, provided you accept a few compromises.

Those compromises do add up, though. There is no dedicated lap button in the native workout app, so you have to double tap the screen, and that gets awkward with wet or gloved hands. Precision start is also missing: the native app starts your run the moment you press start, without confirming a GPS lock first, though some third-party apps solve this.

GPS accuracy is good, but it lacks multiband, which sports watches like the Garmin Forerunner 255, Forerunner 265, and COROS Pace 3 offer at similar or lower prices. In side-by-side testing, the Series 9 traced slightly less smooth corners and lost a bit more confidence under tree cover, which can shorten logged runs.

Heart rate accuracy was also inconsistent during testing. Early runs tracked well, but later sessions recorded readings that were clearly too high rather than simply dropping out. The good news is that pairing an external chest strap is easy and worth doing if you judge your effort from heart rate data.

Battery Life and Health Features

Battery life is what it is: about a day of use, with daily charging. That is fine for many people, but sports watches last far longer, and the Apple Watch Ultra lasts twice as long.

On the health side, the Series 9 records plenty of data, but it lacks the readiness and recovery analysis you get on sports watches. There is no way to pause your activity rings if you are injured or pregnant, and there is no recovery guidance after a big effort, like a marathon the day before. The data exists in the Health app, but piecing it together takes effort, and the app itself is not the most intuitive. It is an area where Apple has room to improve.

From a pure smartwatch perspective, though, it is hard to beat. NFC payments, notifications, and general daily use are all polished, and it looks great on the wrist. The 41mm model, in particular, sits neatly and discreetly, which many will prefer over the bulkier Ultra. The redesigned fabric Sport Loop strap also deserves praise: it dries quickly, and the velcro closure makes it easy to tighten for a run and loosen afterwards.

Buying Advice

If you want a smartwatch, this is easily one of the best on the market. If you want a running watch first and foremost, a dedicated sports watch like the Garmin Forerunner 265 at a similar price delivers advanced training metrics, a lap button, multiband GPS, and far better battery life in a more run-friendly package.

If budget is a concern, the Apple Watch Series 8 feels very similar on the wrist and continues to receive software updates, missing only the brighter screen and double tap gesture. But if you want the latest model, the Series 9 is a genuinely excellent all-rounder: the best smartwatch for sports at its price, lighter and cheaper than the Ultra, and capable enough to track your training well, as long as you are happy to charge it daily and hunt out the right apps for the features you need.

Conclusion

The Apple Watch Series 9 is not a huge leap over the Series 8, but it is an outstanding watch. It delivers the best smartwatch experience available, with sports tracking that is very good even if it concedes a few points, such as the lap button, multiband GPS, and battery life, to dedicated sports watches. If the extra smarts and the design matter most to you, this is a fantastic choice.