Apple Watch Series 11 Review: Strong but Not Perfect
Our full Apple Watch Series 11 review after two weeks of testing: measured performance, battery figures, and whether it is worth £399.
Maya Okonkwo
The short version
The Apple Watch Series 11 is Apple's 2025 entry in a crowded wearables market, and at £399 it is competing against some of the strongest hardware we have tested. After a fortnight of daily use, the headline is straightforward: it delivers the first genuine battery improvement in three generations.
In a sentence: Buy it for the first genuine battery improvement in three generations. Think twice if this would bother you daily: iPhone only.
Build and materials
There is nothing experimental here, which is mostly to the Apple Watch Series 11's credit. The detail worth calling out is that sleep apnoea notifications flagged a genuine issue for one of our testers. Against the rest of the wearables category it feels considered rather than novel.
Performance
Our testing runs the same suite on every device so figures stay comparable across years. The figure worth quoting is Rating: WR50, IP6X. That places it comfortably above average for its price bracket.
| Specification | Apple Watch Series 11 |
|---|---|
| Display | 45mm LTPO OLED, 2000 nits |
| Chip | S10 SiP |
| Battery | 28h with always-on |
| Sensors | ECG, SpO2, temperature |
| Rating | WR50, IP6X |
How we tested
Every figure quoted above comes from the same protocol, run on every unit in this category. This one spent three weeks worn continuously, including overnight. Worn on the non-dominant wrist alongside a chest-strap heart rate monitor and a second reference watch, with all figures logged from the same sessions.
| What we measure | How |
|---|---|
| Heart rate accuracy | Beat-by-beat comparison against the chest strap across steady runs, intervals and weights. |
| GPS accuracy | The same 5km loop, twelve times, compared against a surveyed route. |
| Battery life | A fixed daily pattern — one hour of GPS exercise, always-on display, sleep tracking — run to empty. |
| Sleep tracking | Compared against a manual log of actual sleep and wake times over fourteen nights. |
| Durability | Worn through cooking, washing up and the gym, with no attempt to protect it. |
We deliberately do not report step counts, which every device on the market gets close enough that the differences are noise.
The honest caveat: Wrist-based heart rate is least accurate exactly where people care most — high-intensity intervals.
What we liked
- The first genuine battery improvement in three generations
- The best health sensor suite available
- Fast charging
Taken together, those strengths make it a natural fit for iPhone owners who want health tracking that might actually matter.
Where it falls short
- IPhone only
- A proprietary charger
- Limited watch face customisation
None of these are dealbreakers on their own. Whether they matter depends entirely on how you intend to use it, which is why the section below matters more than the score.
How it compares
The closest alternatives on price are Pixel Watch 3 and Oura Ring 4. All three have been through the same tests, so the figures below are directly comparable rather than collected from different reviews.
| Model | Price | Our score | Standout | Weak point |
|---|---|---|---|---|
| Apple Watch Series 11 (this review) | £399 | 4 / 5 | The first genuine battery improvement in three generations | IPhone only |
| Pixel Watch 3 | £349 | 4 / 5 | A battery that finally lasts a full day | Domed glass that scratches |
| Oura Ring 4 | £349 | 4 / 5 | The most accurate sleep staging we have tested | A mandatory subscription |
Nothing at this price scored higher in our testing, which is the strongest argument for the Apple Watch Series 11.
Is it worth the money?
At £399 the Apple Watch Series 11 asks £29 more than the category average of £370, against an average score of 3.9 out of 5 across the wearables we have tested. Its own 4 works out at roughly £100 per point. You are paying a premium for a genuinely better result, which is defensible if the first genuine battery improvement in three generations is what you are buying it for.
If the budget is the binding constraint, the Fitbit Charge 6 at £139 is the floor we would still recommend — below that the compromises stop being ones you can live with.
Two weeks in
Two weeks in, the figure that stopped mattering was display — 45mm LTPO OLED, 2000 nits is more than adequate and you forget about it by the third day. What kept surfacing instead was that iPhone only, which is easy to shrug off in a spec comparison and harder to ignore at 6pm on a Friday. On the other side, sleep apnoea notifications flagged a genuine issue for one of our testers turns out to be the sort of detail you only appreciate after living with the alternative.
Who it suits
Buy the Apple Watch Series 11 if you are iPhone owners who want health tracking that might actually matter. Skip it if this is something you would notice every day: iPhone only.
Buy it if:
- IPhone owners who want health tracking that might actually matter
- You want the first genuine battery improvement in three generations
- You value the best health sensor suite available
Skip it if:
- You need iPhone only to be a solved problem
- The Pixel Watch 3 at £349 already covers what you need
- You upgraded within the last two years — the gap is not worth the outlay
Verdict
Buy it for the first genuine battery improvement in three generations. Think twice if this would bother you daily: iPhone only.
Score: 4 / 5 · £399 at the time of writing.
Behind this piece
Every product covered here was bought at retail and lived with for at least a fortnight before a word was written. Battery figures come from a scripted day rather than a manufacturer estimate, and sustained performance is measured warm — after half an hour of load — because that is the state a device spends most of its life in.
Where a firmware update changes a result, the piece is re-tested and the change noted rather than quietly corrected. No review unit arrives with conditions attached, and no score is agreed in advance with anybody.
Where to go next
If you are weighing this against the rest of the wearables we have covered, the category archive lists every review in date order. The closest comparisons we have published are Apple Watch Series 11 vs Garmin Fenix 8: Is the 2025 Model Worth the Change? and Apple Watch Series 11 vs Oura Ring 4: Is the 2025 Model Worth the Change?.
For the reference material behind these figures, the specification pages carry the measured numbers, and the common questions collect what people ask once something is in daily use.
