The newest Apple Watch models focus on speed, battery life, and health tracking rather than major design changes

Apple releases a new watch almost every year, and the 2024 models (Series 10 and Ultra 2) are faster processors, longer battery life, and new health sensors compared to older versions. If you own a Series 8 or earlier, the upgrades are noticeable. If you have a Series 9, the differences are smaller — mostly speed improvements and a slightly larger screen on the standard model.

The real question for most people is not what's new, but whether the new features matter for how you actually use a watch. A fitness tracker that counts steps works the same way whether it's this year's model or last year's. The newer sensors are useful only if you care about the specific health data they measure.

Key Takeaways

  • The Series 10 has a larger screen and faster processor than the Series 9, but the same basic fitness and health features.
  • The Ultra 2 adds a second button and slightly better durability, but costs $200 more and is designed for extreme sports, not everyday wear.
  • Older models like the Series 8 or SE still track steps, heart rate, and workouts — the core features most people use.
  • Battery life improved slightly in 2024 models, but all Apple Watches still need charging every one to two days.
  • New health sensors (temperature, blood oxygen, ECG) exist on Series 8 and newer, so you do not need the latest model to access them.

What changed in the Series 10 compared to the Series 9

The screen is about 10 percent larger on both the 42mm and 46mm sizes, which makes text easier to read and gives apps more room. The processor is faster, so apps open quicker and workouts load without lag. These are real improvements if you use your watch to read messages or navigate, but they are not life-changing for step counting or heart rate tracking.

Battery life went from about 18 hours to about 18 hours — Apple claims the Series 10 lasts slightly longer, but real-world use shows both models need charging daily or every other day depending on how much you use the always-on display. The Series 10 added a temperature sensor that tracks your skin temperature at night, which some people find useful for spotting illness early, but it is not a feature most fitness tracker users rely on.

What the Ultra 2 is for, and who actually needs it

The Ultra 2 is a larger, tougher watch with a second button on the side and a brighter screen. It is designed for people who do extreme sports — trail running, diving, mountaineering — where a standard watch might get damaged or be hard to read in bright sunlight. It costs $799 compared to $399 for the Series 10, and that extra $400 buys durability and brightness, not fitness features.

If you wear a watch while sitting at a desk, running on a treadmill, or doing yoga, the Ultra 2 is overkill. The standard Series 10 does everything you need. The Ultra 2 makes sense only if you regularly do activities where a regular watch would break or become unusable.

Whether older models still work for fitness tracking

The Series 8, Series 7, and even the SE (the budget model at $249) all track steps, distance, calories, heart rate, and workouts. They sync with the Fitness app on your iPhone the same way the Series 10 does. The main difference is speed — older processors are slightly slower when opening apps — and screen size, which is smaller on the SE and Series 7.

If you are buying a watch for the first time, the SE is the cheapest entry point and does the core job. If you want a larger screen or faster performance without paying for the Ultra, the Series 10 is the middle ground. The Series 9 is still sold at a discount and is nearly identical to the Series 10 for most uses.

Health sensors: which ones matter and which ones are marketing

All Apple Watches from Series 8 onward have an ECG (electrocardiogram) sensor that detects irregular heart rhythms, a blood oxygen sensor, and a temperature sensor. These are real features, not gimmicks, but they are useful only if you have a reason to monitor them — a heart condition, sleep tracking, or planning pregnancy. For general fitness, they add little value.

The temperature sensor on the Series 10 is new, but the Series 8 and 9 already have temperature sensors. The difference is software: Apple improved how it uses the data, not the hardware itself. If you own a Series 8, you already have the sensor; you just may not see as much detail in the app.

Battery life and charging reality

Apple advertises 18 hours of battery life on the Series 10, which means a full day of use plus overnight. In practice, most people charge their watch every night or every other night, the same as they do with a Series 9 or Series 8. If you turn off the always-on display, battery lasts longer, but then you have to raise your wrist to see the time — which defeats the point of a smartwatch.

No Apple Watch lasts a full week on one charge. If you need a watch that charges once a week, you need a different brand — Garmin, Fitbit, or a basic fitness tracker. Apple prioritizes features and screen brightness over battery life, and that trade-off has not changed in years.

Compatibility: which iPhone you need

The Series 10 works with iPhone 12 and newer. The Series 9 and 8 work with iPhone 11 and newer. The SE works with iPhone 11 and newer. If you have an older iPhone, check Apple's compatibility page before buying — a new watch will not pair with an iPhone 6s or iPhone 7.

All Apple Watches require an iPhone to set up and to use most features. They do not work with Android phones. If you use Android, an Apple Watch is not an option; you need a Wear OS watch or a Fitbit.

Frequently Asked Questions

Is the Series 10 worth buying if I have a Series 9?

Probably not. The Series 9 does the same fitness tracking, has the same health sensors, and lasts the same amount of time on a charge. The Series 10 is faster and has a slightly larger screen, but unless you find yourself frustrated by lag or squinting at your current watch, the upgrade is not necessary.

Can I use an older Apple Watch if I just want to count steps?

Yes. A Series 7 or Series 8 counts steps, tracks distance, and logs workouts just as well as a Series 10. The processor is slower, but you will not notice the difference for basic fitness tracking. Older models are often available used or discounted, which makes them a budget option.

Do I need the temperature sensor?

Only if you are tracking your cycle, planning pregnancy, or monitoring for illness. Most people never use it. If you already own a Series 8 or 9, you have the sensor but may not see detailed data in the app — that is a software difference, not a hardware one.

What is the difference between the Series 10 and the Ultra 2 for everyday fitness?

For everyday fitness, there is no meaningful difference. Both track steps, heart rate, and workouts the same way. The Ultra 2 is larger, tougher, and more expensive. Buy it only if you do extreme sports or need a watch that survives rough treatment.

Can I use an Apple Watch without an iPhone?

No. You need an iPhone to set up the watch and to use most features. Apple Watches do not work with Android phones. If you use Android, you need a different brand of smartwatch.