HRV, overnight heart rate and sleep, read from Apple Health or intervals.icu and scored against your own baseline. The recovery score, the sleep readings and the trend are free; on Elite, today’s session moves with them.
iOS 26+ · iPhone · Free
Measured physiology only. How you feel never moves the number.
Last nightIllustrative
The main signal. One definition of HRV, so the score is one score.
The average across the night, not its single lowest value: a measurement of the night, not of one moment in it.
How you slept, not just how long: time asleep against your own need, efficiency, time awake, deep and REM, and regularity.
Respiratory rate, SpO₂, wrist temperature Supporting signals. They weigh less, but an unusual reading can cap the score on its own.
The session can extend, if the phase allows it.
The session stands as planned, as it does with no reading at all.
It is capped, swapped for an easier type, cut to soft activation, or turned into rest.
With no fresh data for last night, Summit shows no score rather than yesterday’s.
On Elite, a missing reading leaves the session as planned.
One night alone is shown here; the trend and your load are read too.
On the Apple Health route, usually before you open the app.
Pushing a session up takes more evidence than easing it. Everything else that moves the plan →
What you report, such as jet lag, illness or soreness, is not part of the score. An illness flag acts on the plan instead, on Elite.
Both are free on every plan, and both feed the same calculator on the same scale.
Free · the full set
Any wearable that writes to Apple Health works, though only the Apple Watch writes the complete set of metrics Summit uses. Read-only, and the readings stay on your iPhone.
Summit’s own sleep score, stages, debt and regularity.
Free · for Garmin, Whoop and others
A device synced to intervals.icu sends HRV, resting heart rate, sleep duration, respiratory rate and SpO₂.
With no bedtime or stages on this route, Summit shows your device’s own sleep score.
All free, on the Apple Health route.
Built only from how the night was slept, against your own median. HRV feeds the recovery score, not this one.
The hypnogram on a real clock and each stage against the healthy-adult range. No sleep-cycle count: it is not measured.
Fourteen nights of sleep against your goal, the last seven drawn out.
Your bed and wake times against your usual window, and your weekend shift.
| In the app | Plan |
|---|---|
| Recovery score from your night | Free |
| Sleep score, stages, sleep debt and regularity | Free |
| Recovery trend and the recovery widgets | Free |
| Apple Health and intervals.icu as sources | Free |
| Fitness, fatigue and form (CTL, ATL, TSB) | Pro |
| Today’s session, adapted to your recovery | Elite |
The free tier is permanent; Premium’s 14-day trial for new subscribers is a separate thing. Prices, with the storefront and VAT caveat, are on the pricing page →
No. Any wearable that writes to Apple Health works, though only the Apple Watch writes the complete set of metrics Summit uses. A Garmin, Whoop or other device synced to intervals.icu feeds the same recovery score; on that route Summit shows the device's own sleep score. There is no Summit app for the watch: the watch is the sensor, and the iPhone does the reading.
Yes, permanently, with the sleep score and analysis, the trend and the widgets. It is not Premium's 14-day trial for new subscribers. The session that adapts to the score is Elite; the pricing page has the prices and their caveat.
No fresh data for that night, or a baseline still too short. Summit would rather show no score than yesterday's, and on Elite a missing reading leaves the session as planned.
No model decides anything. Codified rules compute it on your iPhone from your own measurements, and the research behind it ships in the app with DOIs: Plews et al. (2013) and Buchheit (2014); Walsh et al. (2021), Hirshkowitz et al. (2015) and Ohayon et al. (2017) for sleep. It is training guidance, not medical advice.
Download Summit and connect Apple Health or intervals.icu. Your recovery score and sleep readings are free, permanently; the session that moves with them is Elite.
iOS 26+ · iPhone · Free