CycleSync

Menstrual cycle phases, projected into Google Calendar.

• PWA
• JavaScript
• Google Calendar API
• OAuth

What it does

Projects a 28-day, four-phase cycle a year ahead into a separate Google Calendar. When a period starts early or late, one tap regenerates the future events.

Highlights

• Runs in the browser; no data touches a server of mine.
• Installable as a PWA on iOS and Android.
• Also available as a Google Apps Script web app.

Sign-in uses Google OAuth and is unverified, so Google shows a warning screen. Only your own calendar is touched, and nothing is sent to me. See the privacy notes.