A zone you define
Set your own heart-rate band. Zone time counts only after you save it.
YOUR RECORDED WORKOUT DATA
WatchVO2Your zones. Your recorded VO₂.
See time in a heart-rate zone you define and VO₂ max values already recorded in Apple Health.
Coming soon for iPhoneExplore the app
Every feature free. No account needed.
YOUR RECORDED WORKOUT DATA
Your zone, your recorded history.
Review time in a heart-rate band you choose and VO₂ values already in Health.
Careful minutes
Zone minutes exclude pauses, long gaps, the band’s upper limit, and duplicate workout time.
Recorded VO₂
See VO₂ max values already in Apple Health. Missing days stay out of averages.
A widget that does not invent
See covered weekly zone minutes, the latest recorded VO₂, or an honest no-data message.
WatchVO2 uses heart-rate and VO₂ records from Apple Health. You choose the zone. It is not a medical device.
Private by design
Your information.
Your choice.
The zone bands you save are stored on your iPhone. Workout and VO₂ samples are read from Apple Health. An account is optional. Health readings are never included in our online backups.
Part of Solstice Suite · Health & Fitness
Every feature, free.
Use the app without an account or a subscription.
Good to know
A few answers.
Can I download WatchVO2 now?
Not yet. It is in development for iPhone.
Does it tell me my correct heart-rate zone?
No. You enter the band. There is no universal zone in the app.
We're here to help.
A real person reads every message.