Apple Watch Series 10 Review: Thinner, Bigger, Faster
The Apple Watch Series 10 represents Apple’s first significant industrial design change since the Series 7 enlarged the display. The case is noticeably thinner (9.7mm vs 10.7mm), the display bezels are reduced further, and the overall profile on the wrist approaches that of a traditional watch rather than a miniature computer. These aren’t spec-sheet improvements — they change how the watch feels and looks daily in ways that matter to people who wear it 16+ hours.
At €450 (41mm) / €480 (45mm), it competes against Samsung Galaxy Watch Ultra, Google Pixel Watch 3, and the existing Apple Watch Ultra 2 within Apple’s own lineup. For iPhone users, the question isn’t whether to buy an Apple Watch (the ecosystem lock-in answers that) but whether the Series 10 represents sufficient improvement over whatever they currently wear.
Design Changes
The thinness is immediately noticeable. At 9.7mm, the Series 10 sits flatter under shirt cuffs and feels less like strapping a device to your wrist. The weight reduction (approximately 10% lighter than Series 9) compounds this impression — the watch disappears into wear awareness faster.
The larger display (relative to case size, thanks to reduced bezels) improves information density without enlarging the physical footprint. Complications show more data, text is more readable, and the always-on display benefits from the additional pixel real estate.
New wide-angle OLED technology enables readability at severe angles — useful when glancing at the wrist without rotating the arm toward your face. Combined with 2,000 nits peak brightness, outdoor readability in direct sunlight is excellent.
Health Features
The Series 10 consolidates Apple’s health platform with one notable addition — sleep apnea detection:
- Sleep apnea detection: Uses the accelerometer to monitor breathing patterns during sleep, alerting users to potential obstructive sleep apnea. Not a clinical diagnosis but a screening tool that prompts medical consultation.
- ECG: Single-lead electrocardiogram for atrial fibrillation detection
- Blood oxygen: SpO2 monitoring (continuous during sleep, on-demand during day)
- Heart rate: Continuous monitoring with high/low alerts
- Temperature sensing: Cycle tracking and baseline deviation alerts
- Fall/crash detection: Automatic emergency services contact
For users who wear the watch during sleep (the thinner profile helps), the health monitoring suite provides meaningful data over time. The sleep apnea feature specifically addresses an under-diagnosed condition — a single night’s alert doesn’t diagnose, but weeks of consistent data can motivate medical consultation.
Performance and Battery
The S10 chip provides fluid performance for all watchOS operations — app launches, complications updates, and workout tracking are instantaneous. No perceptible lag in daily use, which has been true since approximately Series 6 — the CPU is no longer the limiting factor for watch-sized tasks.
Battery: 18-22 hours with always-on display and typical use. This means nightly charging remains mandatory. Fast charging (0-80% in 30 minutes) reduces friction but doesn’t eliminate the routine. Compared to the Amazfit Active 2 (14-day battery) or Garmin watches (7+ days), Apple’s battery philosophy remains “charge daily, accept it.”
watchOS and Ecosystem
watchOS 11 adds Smart Stack widgets, training load management for runners/cyclists, and improved customisation. The watch integrates with iPhone, Mac, AirPods, and HomeKit as expected — unlocking Mac, controlling music, HomeKit device toggling, and Apple Pay are seamless.
For iPhone users, no competing smartwatch offers this integration depth. For non-Apple users, this watch simply doesn’t exist as an option.
Who Should Buy This
Buy if:
- iPhone user wanting the best smartwatch integration available
- Health monitoring (especially sleep apnea screening) is a priority
- Current Apple Watch is Series 7 or older (meaningful design + feature upgrade)
- Value the thinner design for daily comfort and aesthetics under clothing
Skip if:
- Currently on Series 9 (too incremental to justify €450+)
- Need multi-day battery life (Garmin, Amazfit, or Apple Watch Ultra are better)
- Android user (not compatible)
- Want a rugged/outdoor watch (Apple Watch Ultra 2 serves that need)
Final Verdict
The Apple Watch Series 10 is the best mainstream smartwatch for iPhone users — a statement that has been true for every Apple Watch generation and remains true here. The thinner design is the most noticeable improvement in daily wear since the Series 7’s display enlargement, and sleep apnea detection adds genuine health screening value.
The upgrade decision depends on current watch: from Series 7 or older, the Series 10 is a meaningful step forward. From Series 9, it’s cosmetic refinement. For new Apple Watch buyers entering the ecosystem, the Series 10 is the obvious starting point — it establishes the baseline that future watchOS updates will target first. The combination of the thinner chassis, improved sensor array, and S10 chip ensures this hardware remains supported and performant through at least four major watchOS releases, making it a sound long-term investment for anyone committed to the Apple ecosystem.
