Period Tracker With All Features Free — What to Look For

Search for "free period tracker" on Google Play and almost every result is free to install — and almost none is free to use. The pattern is familiar: you log a few cycles, and then predictions, ovulation estimates or even the widget turn out to be "premium". This guide covers what a period tracker genuinely needs to do, why those features cost the developer almost nothing, and how to identify a fully free app before you invest weeks of logging into the wrong one.

The core feature set — and why none of it justifies a subscription

Strip away the marketing and a period tracker is a calendar plus date arithmetic. The features that matter:

• Period logging. Mark start and end days in as few taps as possible. This is the whole foundation — if logging is tedious, you'll stop.
• Next-period prediction. An average of your recent cycle lengths projected forward. It's subtraction and division, computed on your phone in microseconds.
• Ovulation and fertile window estimates. Also simple date math from your cycle length. Useful for planning; never a contraceptive method.
• PMS-day indication. Highlighting the days before a predicted period so mood and symptom patterns stop being surprises.
• Reminders. A local notification a day or two before a predicted period. Android provides this for free to every app.
• A home-screen widget. Cycle day and days-until at a glance without opening the app.
• Cycle statistics. Average and range of cycle and period length — the numbers a doctor will actually ask about.

Notice what's absent from that list: servers, accounts, AI, coaching content. Every item above runs entirely on-device with negligible cost. When an app charges a monthly subscription for prediction or a widget, you are not paying for computation — you are paying because the app can charge, or you are paying with your data instead.

Common paywall patterns to watch for

1. The delayed paywall. Everything is free for a trial period; after you've logged two months, predictions lock. Your data becomes the hostage.
2. The crippled free tier. Logging is free, but ovulation, PMS, widgets and stats are all "Pro".
3. The content upsell. The tracker is free but buried under paid articles, coaching plans and daily "insights" nags.
4. Pay-with-data. No paywall at all — because cycle data linked to your account is the product. Check the Play Store Data safety section.

A pre-install checklist

• On the Play Store listing, check In-app purchases. A subscription price range next to a "free" tracker tells you the real model.
• Read the 1–3 star reviews and search them for "subscription" and "paywall" — users report the delayed paywall pattern reliably.
• Check the Data safety section: the best answer is "No data collected, no data shared".
• Prefer apps that state their model plainly: fully free, ad-supported, or one-time purchase. Any of these is more honest than a "free" app with a hidden subscription.
• Look for local backup/export, so your logged history is never locked in.

Where Peridot stands

Peridot is a simple period calendar for Android where the entire feature list above — prediction, ovulation and fertile window, PMS days, widgets, reminders, statistics — is free, with no subscription and no locked tier. There is also no account and no server: your data stays on your phone and the app works offline. The design is calm and discreet, cream and clay tones instead of pink.

Get Peridot on Google Play — every feature free, from the first day.

This article is general information, not medical advice. Predictions from any period tracker are estimates and must not be relied on as contraception. See a doctor about irregular cycles or other health concerns.