Apple Watch SE (2nd gen) vs Apple Watch SE 3
Apple Watch SE (2nd gen) and Apple Watch SE 3 are 2022 and 2025 smartwatches from the same product line. This comparison separates the catalog's listed specifications from missing information and approximate values. It covers 18 fields, including 7 exact differences; it does not choose a winner.
Specifications side by side
| Field | Apple Watch SE (2nd gen) | Apple Watch SE 3 |
|---|---|---|
| Release year | 2022 | 2025 |
| Case sizes | 40 / 44 mm | 40 / 44 mm |
| Display | LTPO OLED (no Always-On) | OLED, Always-On (new this generation) |
| Brightness | 1000 nits | 1000 nits (approx.) |
| Battery, as listed | Up to 18 hours | Up to 18 hours |
| Operating system | watchOS 9 (still updated) | watchOS 26+ |
| Phone compatibility | iPhone | iPhone |
| Cellular connection | eSIM · LTE (Cellular model) | eSIM · 5G |
| Water rating | 50m | 5ATM |
| Glass | Ion-X | Hardened Ion-X (4x more crack-resistant) |
| Case material | Aluminum | Aluminum |
| GPS | Standard GPS | Standard GPS |
| Maps | No | No |
| Payment system | Apple Pay | Apple Pay |
| Plan requirement | Not required | Not required |
| Listed sensors and features | Heart rate | Sleep apnea, HRV, Skin temperature |
| Safety features | Crash detection, Fall detection, SOS calling | Crash detection, Fall detection, SOS calling |
| Hardware flashlight | No | No |
"Not listed" means the catalog has no usable value for that field. It does not mean the watch lacks the feature. Approximate values stay visible but do not support the difference count or numeric deltas.
Where they differ
- Release year: Apple Watch SE (2nd gen) lists 2022; Apple Watch SE 3 lists 2025. The listed values are 3 years apart.
- Display: Apple Watch SE (2nd gen) lists LTPO OLED (no Always-On); Apple Watch SE 3 lists OLED, Always-On (new this generation).
- Operating system: Apple Watch SE (2nd gen) lists watchOS 9 (still updated); Apple Watch SE 3 lists watchOS 26+. The listed software descriptions are not a guarantee of the software version currently installed on an individual watch.
- Cellular connection: Apple Watch SE (2nd gen) lists eSIM · LTE (Cellular model); Apple Watch SE 3 lists eSIM · 5G. Variant wording is retained. A cellular specification alone does not confirm activation with your mobile carrier.
- Water rating: Apple Watch SE (2nd gen) lists 50m; Apple Watch SE 3 lists 5ATM.
- Glass: Apple Watch SE (2nd gen) lists Ion-X; Apple Watch SE 3 lists Hardened Ion-X (4x more crack-resistant). Keep the variant qualifications when comparing an individual model; this row describes the catalog entry rather than every configuration.
- Listed sensors and features: Apple Watch SE (2nd gen) lists Heart rate; Apple Watch SE 3 lists Sleep apnea, HRV, Skin temperature. This compares the listed feature names, not measurement accuracy, clinical usefulness or availability in a particular country.
Where they are the same
- Both list case sizes: 40 / 44 mm.
- Both list battery, as listed: Up to 18 hours.
- Both list phone compatibility: iPhone.
- Both list case material: Aluminum.
- Both list gps: Standard GPS.
- Both list maps: No.
- Both list payment system: Apple Pay.
- Both list plan requirement: Not required.
- Both list safety features: Crash detection, Fall detection, SOS calling.
- Both list hardware flashlight: No.
Which one fits you
Apple Watch SE (2nd gen) is listed as a smartwatch compatible with iPhone. Start with that phone requirement before comparing the other rows. The exact differences above are a way to identify which listed specifications matter to your use, not evidence that the later generation is better in every respect.
Apple Watch SE 3 is listed as a smartwatch compatible with iPhone. Start with that phone requirement before comparing the other rows. The exact differences above are a way to identify which listed specifications matter to your use, not evidence that the later generation is better in every respect.
Related pages
- Apple Watch SE (2nd gen) specifications
- Apple watches
- Apple Watch SE 3 specifications
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