| Feature | Period Tracker and Calendar | Flo | Clue |
|---|---|---|---|
| Free tier available | Yes | Yes | Yes |
| Paid plan | In-app purchases, TBD — confirm current plan names/prices in-app before publishing | Flo Premium (monthly/yearly) — TBD, price not published outside the app | Clue Plus (monthly/yearly) — TBD, price not published outside the app |
| Ovulation / fertile-window prediction | Yes, from own logged history | Yes | Yes |
| Life-stage modes (TTC / pregnancy / perimenopause / teen) | Yes — dedicated modes for each | Partial — check current app for exact modes | Partial — check current app for exact modes |
| App lock (PIN / biometric) | Yes | Check current app | Check current app |
Checked September 17, 2026. Flo and Clue both keep exact subscription pricing inside their own app/site rather than on a public page (their own help centers confirm this, checked 2026-09-17), so those cells are marked TBD here rather than guessed. Confirm current prices directly in each app before publishing.
Sources: help.flo.health (Flo subscription pricing help article, checked 2026-09-17 — no public dollar figures); support.helloclue.com (Clue Plus pricing help article, checked 2026-09-17 — no public dollar figures); Period Tracker and Calendar's own App Store / Google Play listings, checked 2026-09-17.
What Period Tracker and Calendar is, in one paragraph
Period Tracker and Calendar logs your period and symptoms and predicts your next period, ovulation and fertile window from your own history — with separate modes for trying to conceive, pregnancy and perimenopause.
How this table was put together
Every row above either comes from a source cited below the table or is explicitly marked TBD. Neither Flo nor Clue publish exact subscription prices outside their own app or site — both note that pricing depends on region and store — so this page intentionally does not guess a number. Whoever finalizes this page before launch should open each competitor's current app, note the live price, and replace the TBD cells (see CLAUDE.md's "Outstanding placeholders" list).