Head to head
Apple Apple Watch Series 9 45mmvsApple Apple Watch Ultra 49mm
- Released
- 2023-09-22endoflife.date, retrieved 2026-09-13
- Security updates until
- Not published by the makerApple UK — watchOS 27 compatible models, retrieved 2026-09-22
- Released
- 2022-09-23endoflife.date, 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 Series 9 45mm0 wins for Apple Watch Ultra 49mm1 gap borderline0 differences you won’t notice
Verdict: Apple Watch Series 9 45mm ahead on 1 row, Apple Watch Ultra 49mm on none
On the makers’ published figures, the Apple Watch Series 9 45mm wins on weight (case only) (38.7 g against 61.3 g). One gap is borderline, a difference most people would not notice: battery life (maker's claim) (36 h against 18 h) for the Apple Watch Ultra 49mm. Both state the same peak brightness. 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
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.