Push or rest today.
And know exactly why.
Circadia turns the data your Apple Watch already collects into one honest morning call, grounded in your own numbers. No new hardware. No black box. Nothing sent to a server.
Coming soon to the App Store. Join the waitlist for early access.
Apple Watch and Health
No extra band or ring
On-device AI
Apple intelligence, private
Your data stays put
Never uploaded or sold
Grounded scores
Every number explained
A recovery app that respects your intelligence
Clear answers, honest reasoning, and a circadian view no score-only app gives you.
One clear call
One honest call each morning
Push, Steady, Rest, or Heads-up. Circadia reads what your Apple Watch recorded overnight and tells you what today is good for, measured against your own baseline, not a generic average.
- Built from HRV, resting heart rate, sleep, breathing, and temperature
- Always relative to your normal
- A decision, not just a number
No black box
See exactly why
Every score shows its work. Circadia spells out the real numbers behind today and how each one compares to your baseline, so you can trust the call instead of taking it on faith.
- "Your HRV of 52 ms, 12% above your 56-day baseline"
- Each signal with its direction and trend
- Calculated from your data, on your phone
Circadian, not just recovery
Your light shapes your recovery
Circadia learns your own pattern between morning daylight and how you recover the next day, then nudges you to get the light that actually moves your numbers.
- Finds your personal daylight to recovery link
- A simple morning-light goal
- The circadian edge other apps miss
For night owls and travellers
Fix a drifting body clock
Staying up later and later? Circadia maps your real sleep timing across recent weeks and builds a gentle, step-by-step plan to pull it earlier. Useful for late risers and for jet lag.
- Sees how far your schedule has drifted
- A realistic shift plan, not cold turkey
- Backed by daylight timing
Set up in two minutes
No new gear, no fiddly configuration.
Connect Apple Health
Grant read access once. Circadia never writes ads or uploads a thing.
Wear your Watch to sleep
It already records the signals that matter overnight.
Check your morning call
Open Circadia and see whether today is for pushing or resting, and why.
Private by design
Your health data stays on your phone
Most health apps send your most personal data to a server. Circadia does the opposite. Everything is computed on your device, including the AI coaching, which runs on Apple's on-device intelligence.
Nothing is uploaded
Your readings never leave the device.
Never sold, never for ads
Your health is not a product.
On-device intelligence
The AI runs locally, with no server calls.
Not stored in iCloud
It lives on your phone, full stop.
Simple, honest pricing
The daily call is free. Go deeper with Pro.
Free
$0
Your daily readiness call, every morning.
- The morning call: push, steady, rest
- Body Battery and core graphs
- Apple Health and Watch sync
Circadia Pro
$29.99 / year
Or $4.99 / month. Cancel anytime.
- Everything in Free
- Full score explanations and trends
- Daylight to recovery insights
- The body-clock shift plan
- On-device AI coaching
Questions, answered
An Apple Watch gives the best results because it records overnight heart-rate variability, heart rate, and sleep. Any device or app that writes those to Apple Health will also work. Circadia reads from Apple Health, it does not need its own hardware.
Know whether to push or rest, every morning
Be first to get Circadia when it lands on the App Store.