The Apple Watch Ultra is no longer the new kid on the block. Three generations in, it has carved out a clear niche: the premium smartwatch for people who actually work out, but maybe not quite serious enough for a Garmin. Now, the Ultra 4 is coming later this year, and if the rumors are true, Apple is planning some meaningful upgrades.
Let us break down what we know, what we suspect, and why it matters for the competitive landscape.
The State of the Ultra Line
Before we dive into Ultra 4, it helps to understand where the Ultra line stands. The Ultra 3 launched in September 2025 with modest improvements over its predecessor: a slightly brighter display, better GPS accuracy, and the first meaningful battery bump the line has seen.
Apple now claims up to 42 hours of battery life on the Ultra 3, up from 36 hours on the Ultra 2. In low power mode during GPS workouts, you can stretch that to around 20 hours. That sounds decent until you compare it to what Garmin and COROS offer.
The Garmin Forerunner 970 gets 23+ hours with dual-band GPS running continuously. The COROS PACE 4 manages 31 hours. The Fenix 8 line? Some models hit 50+ hours. For ultra runners and multi-day backpackers, that gap is still massive.
But here is the thing: Apple has never tried to compete on raw battery. The Ultra is positioned as a do-everything device that happens to be rugged enough for athletes. Most Ultra owners probably charge it nightly anyway. The 42-hour claim means you could theoretically wear it through a weekend of light use without a charger. That is progress.
The Four Rumored Upgrades
1. New Health Sensors
According to supply chain reports from Digitimes, the Ultra 4 will roughly double the number of sensor components inside the watch. That is a big deal because Apple has been heavily relying on algorithmic interpretations of data from a relatively limited sensor array.
More sensors means Apple can rely less on software estimates and more on direct measurements. The obvious question: does this mean blood glucose monitoring?
The answer, frustratingly, is probably not this year.
Apple has been working on non-invasive blood glucose monitoring for over a decade. The technology could revolutionize diabetes management, letting millions of people track blood sugar without finger pricks. But the engineering challenges have proven immense. The sensor needs to read glucose through skin and fat, accounting for hydration levels, skin temperature, and dozens of other variables.
Current reports suggest blood glucose is still not ready for the Ultra 4. It might come in 2027 or 2028. What we might get instead are improved heart rate sensors, better blood oxygen accuracy, and maybe new temperature-based metrics for cycle tracking.
Either way, more sensors is good. More data usually means better insights, assuming Apple knows what to do with it.
2. Industrial Design Changes
The Ultra has always been a chunky watch. At 49mm, it is significantly larger than a standard Apple Watch. The original design was clearly built to signal "rugged" — the titanium case, the raised bezel, the extra button.
For Ultra 4, Apple is reportedly planning "alterations to the exterior design." That could mean anything from minor tweaks to a more substantial refresh.
Here is the interesting context: there were rumors that Apple was planning a much larger Ultra with a microLED display. MicroLED would have offered better brightness, improved power efficiency, and that premium Apple display technology that people actually notice. But Apple reportedly shelved those plans. Without microLED, the design changes might be more modest.
We might see a slightly thinner case, or perhaps a new color option. The Digital Crown might get a slight redesign. But do not expect the Ultra to shrink dramatically. Apple has been clear that bigger means bigger battery, and that is a trade-off they are willing to make.
3. Touch ID
This one is intriguing. Leaked code suggests Apple is working on bringing Touch ID to the Apple Watch, likely for the Ultra 4.
Think about where they could put it. The side button is one option, though that would require modifying hardware that Apple has kept remarkably consistent. The Digital Crown is another possibility, though that would be a bigger engineering challenge. Or it could go into the Action Button, which is already programmable.
Why does Touch ID matter on a watch? A few reasons:
First, security. Currently, Apple Watch relies on your iPhone for authentication or just a simple passcode. Touch ID would let you authenticate directly on the watch for Apple Pay, unlocking the watch, or approving sensitive actions.
Second, convenience. You would not need to reach for your phone as often. Just tap your finger on the side button and you are authenticated.
Third, accessibility. For some users, Face ID on Apple Watch (which does not exist) would be impractical. Touch ID gives them another option.
The biggest question is whether Apple can fit a fingerprint sensor into the tight confines of a watch case while maintaining water resistance and the premium feel that justifies the Ultra price.
4. Power Efficiency Gains
This might be the most important upgrade, even if it sounds boring.
Digitimes reports "significant" power efficiency improvements, likely from a new S-class chip. The Ultra 3 already improved battery life by about 15%, and the Ultra 4 could see similar gains.
Why does this matter? Because every hour of battery life Apple adds makes the Ultra more viable as a serious sports watch.
Right now, the Ultra is great for runs, gym sessions, and even moderate cycling. But if you want to track a 50-mile ultramarathon or a multi-day backpacking trip, you are going to need to charge it halfway through. With 50+ hours of GPS battery, Garmin and COROS watches can handle those events without a charger.
If Apple can push the Ultra 4 to 50+ hours, it becomes a legitimate option for serious endurance athletes. That would be a big shift in the market.
Of course, there is a catch. Apple could also use those efficiency gains to shrink the battery and add new features instead. We will have to wait and see what trade-offs Apple makes.
How This Compares to the Competition
The adventure watch market is heating up. Garmin continues to dominate the serious athlete segment, but Apple has been making inroads. Here is how the Ultra 4 might stack up if the rumors materialize:
| Feature | Ultra 4 (rumored) | Garmin Fenix 8 | COROS PACE 4 |
|---|---|---|---|
| Battery (GPS) | ~25+ hours | 50+ hours | 31 hours |
| Battery (smartwatch) | ~45+ hours | 28 days | 20 days |
| Multi-band GPS | Likely | Yes | Yes |
| Touch ID | Yes | No | No |
| Blood glucose | No | No | No |
| Maps | Yes | Yes | Yes |
| Music storage | Yes | Yes | Yes |
The battery gap is closing, but Garmin and COROS still lead significantly. That said, Apple wins on smart features, app ecosystem, and seamless iPhone integration.
The Blood Glucose Question
It is worth spending a moment on blood glucose because it is the white whale of wearable health tracking.
Every major tech company — Apple, Samsung, Google — has been working on non-invasive blood glucose monitoring. The prize is enormous: millions of diabetics would benefit, and the market potential is massive.
But the physics are brutal. Glucose molecules are small, and measuring them through skin requires detecting incredibly subtle signals. Variables like hydration, skin temperature, and motion all interfere.
Apple has made progress. They reportedly have working prototypes in the lab. But shipping a consumer product? That requires standards of accuracy that no company has cracked yet.
The Ultra 4 will not have blood glucose monitoring. But the Ultra 5 or Ultra 6 might. When it finally arrives, it will be the most significant health feature in wearable history.
What We Do Not Know
As with any pre-announcement rumors, take everything with a grain of salt. Some things we still do not know:
- Price: The Ultra 3 started at $799. Will the Ultra 4 cost more? With new sensors and chips, probably.
- Display: Will Apple finally add the rumored microLED display, or stick with OLED?
- Size: Will the case grow to accommodate more sensors, or stay the same?
- Release date: Expect September 2026, alongside iPhone 18.
The Bottom Line
The Ultra 4 looks like an incremental but meaningful upgrade. The new sensors, Touch ID, and efficiency gains are all real improvements. None of them are revolutionary on their own, but together they could make the Ultra a more compelling option for athletes who also want a great smartwatch.
The big question is whether Apple can close the battery gap. If they can get to 50 hours of GPS tracking, Garmin has something to worry about. If they stay in the 20-30 hour range, the Ultra remains a great crossover device but not a true endurance sports competitor.
We will know more as the fall approaches. But one thing is clear: the Ultra line is maturing. Apple is no longer experimenting — they are iterating. And that is exactly what the market needs.