Fasting Companion Tracker
Pick a window, start the timer, and keep a private history, all in your own browser.
This free tracker is guest-only: everything saves in this browser on this device, with no account and no sign-in. It's general educational information, not medical advice. Not sure where to start? Try the free Fasting Readiness Quiz first (not a medical clearance), or read what fasting windows actually mean.
Your window
All five windows are open to everyone. There is no required order and no ranking. Pick whichever fits your day, and change it any time, including backtracking to an easier one.
Eating window schedule
Set when your eating window starts each day. Your eating window length comes from the tier you picked above. This is only your own planned personal schedule, not a medical recommendation, and changing it never rewrites an active or already-saved session.
Current session
Correct this session's times
Confirm end time
Adjust the stop time if needed, then confirm.
Backup and restore
This free tool has no account and no cloud sync. Everything is saved only in this browser on this device. Export a JSON backup regularly, especially before clearing browser data or switching devices or browsers; it is the only way to move or recover your history.
Importing the same file twice is safe: already-present sessions are skipped, never duplicated. A malformed or invalid file is rejected with nothing changed.
History
Saved only on this device and this browser. Clearing site data or switching devices/browsers will lose your history unless you've exported it above.
No completed sessions yet.