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Nadi vs The Agenda: two takes on cycle phases in your calendar
Most period trackers are apps. The Agenda and Nadi share a rarer starting point: your cycle phases belong in the calendar you already use. Here is how the two differ — written by the Nadi team, and honest about that.
The shared idea
Both tools reject the "another app to check" model. The Agenda brings a four-phase view of the cycle into Google Calendar; Nadi writes your four estimated phases — menstrual, follicular, ovulatory and luteal — into Google or Apple Calendar. If you are choosing between the two, you have already made the important decision: cycle awareness works best where you already plan. We think The Agenda deserves credit for that same insight.
Side by side
| What matters | Nadi | The Agenda |
|---|---|---|
| Calendars supported | Google Calendar and Apple Calendar | Google Calendar |
| Four-phase view | Yes — all four phases as calendar events | Yes — a four-phase view in Google Calendar |
| Method transparency | Published in plain English, with sources, on a public page | See The Agenda's own materials |
| Calendar permissions | Narrowest Google permission available — Nadi can only see the calendar it creates, never your other events | See The Agenda's own materials |
| Beyond the calendar | Workplace education sessions, guides and a research-backed FAQ | See The Agenda's own materials |
We are the team behind Nadi, so read this page accordingly. We have kept claims about The Agenda to what we can state confidently at the time of writing and left their column to their own materials where we cannot — check their site for current features and pricing.
How Nadi approaches it
Three inputs — last period date, average cycle length, average period length — and Nadi maps your four phases by counting back from your next predicted period, the method the research best supports. The phases land in a separate, dedicated calendar in your Google or Apple account, so one tap hides or removes them and Nadi never touches your other events. And we are explicit about limits: these are estimates, published openly, and Nadi is a planning tool — not an ovulation predictor or contraceptive method.
Add your cycle to your calendarSee the wider field in our round-up of period trackers that sync with your calendar, or read how we calculate your phases.