Log
Log a night in one tap
Tap Sleep Now when you lie down and Wake Now when you get up, or fill in the Log form after the fact. A night broken into pieces is kept as one split sleep, so the gaps don't skew your numbers.
Drift
Your drift and your τ
Circadia estimates your body's own day length, τ, from your real nights, and shows how far your sleep moves each day, with a confidence range on the estimate.
Forecast
Smart and Adaptive forecasts
Two models forecast your next sleep windows from your own history. Free accounts see one night from each model; Circadia Plus unlocks the full 14-night forecast.
Clock
The Clock dial
A 24-hour dial with a ring for each day, so drift shows as your sleep stepping around the clock. The outer planner ring places meds, meals and wind-down at times counted from when you wake.
Calendar
Calendar and actogram
The drift calendar shows every night day by day, with an Awake view of the hours in between. The actogram stacks your nights so the staircase of a drifting rhythm is plain to see.
Analysis
Analysis
Totals and trips around the clock for each year, how steady your drift is, which tags and flags show up most, sleep by menstrual-cycle phase, and how close each forecast came to your real nights.
Import
Bring your history
Import years of past nights from Apple Health, Fitbit, Oura, Garmin (through a Guava export), AutoSleep, Sleep as Android, Sleepmeter, Eight Sleep, Huckleberry, a spreadsheet or pasted notes, and Circadia works out your rhythm from all of it. With Circadia Plus, Oura can also sync new nights on its own.
Event Check
Will I be awake?
Enter an appointment and Event Check tells you whether you're likely to be awake, what time it will feel like to your body, and which windows that week will be easier. Event Check is part of Circadia Plus.
Report
A report for your doctor
A print-ready report with your chart, actogram and key numbers, plus a plain-language section on Non-24 and other circadian rhythm disorders. Save it as a PDF to bring to appointments.
Community
Community and Sky
See people whose body clocks run near yours, vote in polls, and find your own star in Sky, which shows where your body clock sits among everyone else's.
Games
Daily games
Inference, Synapse and Tessera each have a daily puzzle that resets when your body's day ends, not at midnight, with leaderboards to play against.
Research
Research, with consent
Sharing is off until you choose a level: with Circadia, with researchers, or in published research. You can turn it off any time, though data already in a published dataset stays there.
