We put cycle dates into a calendar you can read alongside your training, meals and recovery. Foleil's phase bands, period markers and selected-day details give the record a clear shape, while a period range keeps several related dates together. You can move through days without mentally rebuilding the month from separate entries.

Our advantage is practical context. A calendar gives your own observations somewhere to live inside the routine you already manage. It does not turn a predicted phase into a measured hormone level or tell you that every person experiences a cycle in the same way.

How it works

Open cycle tracking to see the month, its phase colours and the selected day's records. Step between dates, return to today and open the day log to review or add information. Recorded period dates and estimated timing remain different kinds of information, and estimates pause where the available context does not support them.

Why it matters

Dates matter when you look back: a remembered difficult week is less specific than a dated note. A calendar helps you ask whether a pattern appears repeatedly, without treating a single coincidence as a conclusion.

Apple's Cycle Tracking guide, accessed 19 October 2026, explains period logging and predictions and warns against using cycle tracking as birth control. That supports an important limit, rather than validating Foleil's estimates. We present the calendar as an organising tool, with the person's recorded experience carrying more weight than a generic phase description.

Compared with other health and fitness tools

Clue documents both Cycle View and Calendar View, experience tracking and cycle history in its official explainer, accessed 19 October 2026; the article carries a 5 September 2022 date. We do not claim to invent the cycle calendar. Foleil's reason to choose this workflow is that your calendar sits within the same app as a reviewed training week, food preparation and everyday check-ins. The comparison concerns that joined routine, rather than prediction accuracy.

The evidence and a practical example

Consider an illustrative month with a recorded period spanning several days and two notes about low energy. You can review the relevant dates, see which entries actually exist and then look at the sessions you scheduled around them. A day with no note stays a day without a note; it is not evidence that you had no symptoms.

The visible evidence is the distinction between your saved entries and the calendar's estimated context. Editing a past entry changes the record you are reviewing. It does not establish that the app knew the timing in advance, and a coloured band is not a clinical finding. This example uses invented circumstances, with no claim about a real person's health.

Frequently asked questions

Does the calendar measure hormones?

No. Phase context is estimated from available cycle information. It is not a blood test or a measurement of hormone levels.

Can I review a date other than today?

Yes. Day stepping and the month calendar let you review earlier entries and return to today without changing their dates.

Is Foleil cycle tracking birth control?

No. Cycle estimates are not for contraception. Recorded dates and predicted timing should not be treated as interchangeable.

Sources