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Period trackers that sync with your calendar
If you plan your life in Google or Apple Calendar, a cycle tool that lives anywhere else is a tool you will eventually stop opening. Here is the honest state of the options — including where we fit, and where we don't.
Two very different approaches
"Syncs with your calendar" can mean two things. Calendar overlays are built for it: your phases appear as events in the calendar itself. Standalone apps keep your cycle in the app, and any calendar presence is a secondary feature at best. The right choice depends on where you actually look when you plan your week.
At a glance
| Tool | Type | Calendar support | Best for |
|---|---|---|---|
| Nadi | Calendar overlay | Google and Apple Calendar — all four phases as events in a dedicated calendar | Planning work and life around your whole cycle, without a new app |
| The Agenda | Calendar overlay | Google Calendar — a four-phase view | A phase view for Google Calendar users |
| Flo | Standalone app | Cycle lives in the app; does not offer a phase overlay onto your everyday calendar (at the time of writing) | Detailed logging, predictions and broad health content |
| Clue | Standalone app | Cycle lives in the app; does not offer a phase overlay onto your everyday calendar (at the time of writing) | Science-led tracking and cycle education |
Features change; this reflects our understanding at the time of writing. Check each provider's site for current details, and read our full comparisons: Nadi vs The Agenda, Nadi vs Flo and Nadi vs Clue.
The overlays: Nadi and The Agenda
Both start from the same insight: cycle awareness sticks when it is visible where you plan. The Agenda brings a four-phase view into Google Calendar. Nadi writes all four estimated phases into Google or Apple Calendar from three inputs at setup, keeps them in a separate calendar it creates (so it never touches your other events), and publishes its method openly — estimates framed as estimates.
The apps: Flo and Clue
Flo and Clue are excellent at what they are built for: daily logging, period prediction and health content inside a dedicated app. If that is the relationship you want with your cycle data, either serves you well. But if your honest pattern is that new apps get opened for a fortnight and forgotten, the overlay route asks less of you — nothing to remember, because your phases are already next to your meetings.
How to choose
- You live in Google or Apple Calendar and want planning, not logging: choose a calendar overlay.
- You use Apple Calendar: Nadi supports it with a dedicated overlay.
- You want daily logging and in-app health content: a standalone app like Flo or Clue fits better.
- You want contraception or precise ovulation detection: none of these — speak to a healthcare professional about physiological methods. Nadi in particular is a planning tool, not an ovulation predictor or contraceptive method.
New to phase-based planning? Start with the four cycle phases or our guide to planning your work around your cycle.