Chrome Extension

Your cycle,
on your calendar.

Cycle Sync imports your period data from Health Apps and adds smart predictions directly to Google Calendar — with zero accounts and zero servers.

Coming to Chrome Web Store Privacy Policy

Cycle Sync

avg cycle

avg period

day shift

Jun 25, 2026

1 day

predicted

Jul 26, 2026

1 day

predicted

Sync to Google Calendar

How it works

Three steps to your calendar

Export your health data

From Apple Health: Settings → Health → Export. From Clue, Flo, or Natural Cycles: use their CSV export option.

Upload to Cycle Sync

Open the extension, drop your file.

Sync to Google Calendar

One click adds all events. Predicted days appear in blood red with an RSVP invite — accept when your period arrives, decline if it doesn't come.

Privacy

✓ All processing happens locally in your browser

✓ Only Google Calendar is contacted — using your own account

✓ No tracking. No analytics. No ads.

Get Cycle Sync