Head to head
Apple Apple Watch SE 3 40mmvsApple Apple Watch Series 10 42mm
- Released
- 2025-09-19Apple Newsroom — Apple Watch SE 3, retrieved 2026-09-13
- Price
- £219Apple UK store, retrieved 2026-09-13
- Security updates until
- Not published by the makerApple UK — watchOS 27 compatible models, retrieved 2026-09-22
- Released
- 2024-09-20endoflife.date, retrieved 2026-09-13
- Security updates until
- Not published by the makerApple UK — watchOS 27 compatible models, retrieved 2026-09-22
0 wins for Apple Watch SE 3 40mm1 win for Apple Watch Series 10 42mm2 gaps borderline1 difference you won’t notice
Verdict: Apple Watch Series 10 42mm ahead on 1 row, Apple Watch SE 3 40mm on none
On the makers’ published figures, the Apple Watch Series 10 42mm wins on peak brightness (2,000 nits against 1,000 nits). 2 gaps are borderline, differences most people would not notice: case size (40 mm against 42 mm) and charge to 80% (30 min against 45 min) for the Apple Watch Series 10 42mm. The difference in weight (case only) is below the threshold you would notice. Both state the same battery life (maker's claim). The other 24 rows have no threshold or no direction to judge by, so nobody wins them.
True to scale
Case outlines from each maker’s published dimensions, drawn to scale. Corner rounding is our drawing convention, not a measurement.
Specifications
A win is marked only where the figures can be ranked and the gap is one you could notice on the wrist. A row the site has no threshold for says whether the two differ, and that it is not ranking them. = marks the same figure on both, ≠ not ranked a difference with no ranking. Every figure carries its source.
Body
Display
Platform
Battery
Health
Connectivity
6 attributes neither watch has a sourced figure for
Strap width · Display size · RAM · Battery capacity · Blood pressure · Cellular model price. Rows appear as sources are cited — a gap in our data, not a statement about either watch.
Other comparisons
The pairs a buyer of either watch would also weigh. Any two watches in the catalogue can be compared from the chooser.