AI summary of diffs below.
Ultra 4 vs Ultra 2
Ultra 4 vs Ultra 1
Ultra 4 vs Ultra 2
- Display: LTPO3 + wide-angle OLED; larger active display / thinner borders
- Always-on: 1 Hz → ticking seconds when wrist is down
- Battery: 50h vs 36h; Low Power 84h vs 72h
- Charging: ~45 min vs ~60 min to 80%
- Heart sensing: new Health Sensing System; HR measured every 5 sec
- HRV: measured up to 24× more frequently + new Recovery HRV
- Readiness: new
- GPS: newer/more accurate GPS system
- Chip: S11 vs S9
- 5G: 5G RedCap added
- Satellite: Messages + Find My + Emergency SOS via satellite
- Audio Intelligence: new
- Steps: redesigned ML-based step tracking + Steps complication
Ultra 4 vs Ultra 1
- Display: LTPO3 + wide-angle OLED, 3000 nits vs older OLED, 2000 nits
- Always-on: 1 Hz / ticking seconds vs slower refresh
- Active display: larger screen / thinner borders
- Battery: 50h vs 36h; Low Power 84h vs ~60h
- Charging: ~45 min vs ~60 min to 80%
- Heart sensing: Health Sensing System + 5-sec background HR
- HRV: dramatically more frequent measurements + Recovery HRV
- Readiness: new
- Chip: S11 vs S8
- Storage: 64GB vs 32GB
- GPS: newer/more accurate GPS
- 5G: 5G RedCap vs LTE
- Satellite: two-way messaging/Find My + Emergency SOS
- UWB: 2nd-gen vs 1st-gen
- Precision Finding: yes vs basic Find My
- Double Tap: yes vs no
- Audio Intelligence: new
- Siri: Siri AI / Apple Intelligence vs original Siri
- Step tracking: substantially improved + Steps complication
- Speaker/microphones: newer, more capable audio hardware