Head to head
Apple Apple Watch SE 3 44mmvsApple Apple Watch Ultra 3 49mm
- Released
- 2025-09-19Apple Newsroom — Apple Watch SE 3, retrieved 2026-09-13
- Price
- £249Apple UK store — SE 3 44mm GPS, retrieved 2026-09-22
- Security updates until
- Not published by the makerApple UK — watchOS 27 compatible models, retrieved 2026-09-22
- Released
- 2025-09-19Apple UK Newsroom — Apple Watch Ultra 3, retrieved 2026-09-13
- Security updates until
- Not published by the makerApple UK — watchOS 27 compatible models, retrieved 2026-09-22
1 win for Apple Watch SE 3 44mm2 wins for Apple Watch Ultra 3 49mm0 differences you won’t notice
Verdict: Apple Watch Ultra 3 49mm ahead on 2 rows, Apple Watch SE 3 44mm on 1 row
On the makers’ published figures, the Apple Watch SE 3 44mm wins on weight (case only) (32.9 g against 61.6 g); the Apple Watch Ultra 3 49mm wins on peak brightness (3,000 nits against 1,000 nits) and battery life (maker's claim) (42 h against 18 h). Both state the same charge to 80%. The other 26 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
Apple Watch Ultra 3 49mm is ahead here, by a gap you’d notice.
Health
Connectivity
5 attributes neither watch has a sourced figure for
Strap width · Display size · RAM · 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.