Cycle Sync

Cycle Sync imports your menstrual cycle data and puts it on Google Calendar — automatically predicting the next 6 months based on your personal history.

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HOW IT WORKS
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1. Export your health data from Apple Health, Clue, Flo, or Natural Cycles
2. Upload the file to Cycle Sync (XML or CSV)
3. See your cycle history and 6-month predictions instantly
4. Click "Sync to Google Calendar" — done

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FEATURES
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▸ Supports Apple Health export.xml, Clue CSV, Flo CSV, Natural Cycles CSV
▸ Smart prediction algorithm — if your last period was 2 days late, the next prediction shifts by 2 days
▸ Each day of your period appears as its own Google Calendar event (blood red color)
▸ Predicted events include a ±1 day buffer for early arrival
▸ RSVP on predicted events to confirm or deny — helps refine future predictions
▸ 6 months of future predictions synced at once

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YOUR PRIVACY IS THE PRIORITY
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▸ Your health data NEVER leaves your device
▸ All processing happens locally in your browser
▸ No account required, no servers, no tracking
▸ Only Google Calendar is contacted — using your own credentials

Full privacy policy: https://scarlett0018.github.io/privacy.html