HRV, resting heart rate and breathing
The three overnight vitals that move with recovery, each compared with your rolling baseline so a low number means low for you.
Recovery score
A recovery score you can actually use.
Every morning Sixteen compares your HRV, resting heart rate, breathing rate and sleep against your own baseline and gives you one percentage. Green means go. Red means the plan changes.
Know before you go.
Recovery is your body against your own baseline, never against a stranger's.
Capped by sleep
Great vitals on five hours of sleep do not make a 90% morning. Sleep, load and your journal each set a ceiling, so nothing gets counted twice.
Journal that explains the number
Tag alcohol, late meals, screens in bed or a hard session. Over a few weeks you see which ones cost you the most.
Weekly trends
Seven day recovery and HRV bars so a bad Tuesday reads as a blip, and a bad fortnight reads as a pattern.
Then it changes the day
Measured is not the same as changed.
Recovery feeds the rest of your day. A red morning lowers the strain target and unlocks a lighter session. A green one raises it. Either way the coaching line at the top tells you what to do with it.
How earning screen time worksQuestions people ask
Is there a recovery score on Apple Watch?
Not built in. Sixteen computes one from the HRV, resting heart rate, sleep and respiratory rate that Apple Watch writes to Apple Health, compared with your own baseline, and shows it every morning.
Is there an app similar to Oura readiness for Apple Watch?
Yes. Readiness and recovery are the same idea. Sixteen shows a daily recovery percentage from Apple Watch data, plus a sleep score built on hours against your own need.
How is the Sixteen recovery score calculated?
From overnight HRV (rMSSD), resting heart rate and respiratory rate compared with your own rolling baseline, then capped by last night's sleep, recent training load and anything you logged in the journal. The full method is on the Science page.
Can I get a recovery score from an Apple Watch?
Yes. Wear the watch to bed and Sixteen reads the overnight vitals from Apple Health. No extra hardware is needed.
Is this the same as WHOOP recovery?
It answers the same question with the same family of inputs. We do not claim it is more accurate than WHOOP or anyone else. What is different is what happens after the score: Sixteen changes your day.
How many nights before the score is reliable?
Sixteen shows a learning state for the first week while it builds a baseline. If you already have Apple Health history it seeds the baseline from that.
SixteenPay once. Keep your data. Earn your scroll.
Sixteen is $99 once for lifetime access, or $19.99 a month. Connect the wearable you already own. No hardware to buy, no membership that expires.
iPhone (iOS 17 or later). Prices in USD.