10 Best Free Period & Cycle Tracker Apps for iPhone
Updated October 29, 2026 · written by AppHunt
Every period tracker predicts your next period, but not the same way: some average your recent cycles, others also use ovulation tests, basal temperature or a smartwatch. They differ, too, in what you can log, from flow and moods to sex, pills and pregnancy, and in where that log lives: only on your phone, or in an account on the developer's servers. Here is how each of the ten works, in our own words.
Rivula
AppHunt partner · promo codeRivula gives a range, not a single date, for your next period, your fertile window and ovulation; it tightens as your history grows, and LH tests or basal temperature sharpen it. There is no sign-up and no advertising, and the journal is kept on your iPhone rather than a server, behind Face ID if you like. Logging, predictions, reminders, widgets, backups and Apple Health sync cost nothing; Pro adds pattern insights, LH and temperature charts and a doctor report, and it is free for good with our promo code.
Good for: People who want their cycle data to stay on their phone
Flo
The most-rated period tracker in the US App Store, by a wide margin. Flo forecasts periods, fertile days and ovulation from what you log and offers more than 70 symptoms and moods to track; Pregnancy Mode and perimenopause tools take over when your needs change. Flo for Partners lets someone you invite follow your cycle.
Good for: One app for every life stage
Keep in mind: Core tracking is free; daily insights, the virtual health assistant and member chats need Flo Premium. The developer offers an Anonymous Mode that keeps your health data apart from personal identifiers.
View in the App Store
Clue
Clue is based in Berlin, so your data falls under European privacy law (GDPR). You can log more than 200 symptoms and experiences, record your birth control method, from the pill to an IUD, and switch modes for cycle tracking, conception, pregnancy or perimenopause. Temperature, sleep and heart rate can come in from Apple Watch, Oura and other wearables.
Good for: Detailed symptom logs and birth control tracking
Keep in mind: Clue Plus, a subscription, adds deeper analysis and advanced predictions. The developer lists Clue as a regulated medical device for its Conceive mode, which predicts fertile days for people trying to get pregnant; Clue is not meant for contraception.
View in the App Store
Period Tracker Period Calendar
A calendar-style tracker that works without registration. Next to period and fertile-day predictions it keeps reminders for any birth control method, from the pill to a patch, ring or injection, and for other medicines you take. Partner mode shares your cycle, and one phone can hold several profiles, for a mother and daughter, say.
Good for: Birth control and pill reminders in the same app
Keep in mind: The developer states that no account is needed and that data stays on your device, though its App Store privacy label lists health data as linked to you. The free version shows ads, which a purchase removes; Premium adds trend analysis and courses.
View in the App Store
Stardust
Stardust adds astrology to a standard tracker: next to period, PMS and fertile-window predictions, it lines your cycle up with the phases of the moon and offers zodiac readings and a daily card. Basal temperature can come from an Apple Watch or an Oura ring, and you can invite a partner or friends to follow along.
Good for: People who like moon phases and astrology with their tracking
Keep in mind: Per the developer, personal health data is neither sold nor shared. The listing doesn't say which features are paid.
View in the App Store
Eve by Glow
Eve puts your sex life at the center: you log sex, moods and symptoms next to your period, and an open community talks about sex and health. Period and ovulation forecasts get more precise as your history grows, and a staircase-shaped chart lays out your past cycles.
Good for: Tracking your sex life and moods along with your period
Keep in mind: Rated 16+ on the App Store. Glow Premium adds advanced charts, cycle analysis and private messaging.
View in the App Store
My Cycle
About as simple as a period tracker gets: mark the days of your period, and the app reminds you a few days before the next one and marks your likeliest days to conceive. Notes on symptoms, mood and sex turn it into a small personal diary, and it now backs up to iCloud and shows simple statistics.
Good for: A plain period log with nothing to buy
Keep in mind: Per the developer, the app is entirely free: there is nothing to buy and no advertising. The listing doesn't mention Apple Health.
View in the App Store
Ovia
Ovia stays with you from period tracking through trying to conceive, pregnancy, postpartum recovery and menopause. The fertility calendar gives a daily score, you can log nutrition and birth control alongside symptoms and sex, and more than 2,000 articles explain what you are seeing. Family members or friends can be added to see your updates.
Good for: One app from trying to conceive to postpartum and menopause
Keep in mind: There are no in-app purchases in the US App Store; coaching and programs for conditions such as PCOS or endometriosis come through some employers and health plans, per the developer.
View in the App Store
Period Tracker by GP Apps
On the App Store since 2009 and still simple: tap a button when your period starts, and the app averages your last three cycles to predict the next one, placing ovulation 14 days before it. Moods, symptoms, weight and temperature share one month view, and the home-screen icon just reads PTracker.
Good for: A simple, discreet tracker with a long track record
Keep in mind: Ad-supported; the Patron membership ($9.99 a year) adds extra features. Backups go to an optional online account that also works across platforms.
View in the App Store
Femometer
Femometer is built for charting fertility signs. You record basal body temperature, LH and pregnancy tests and cervical mucus, and the app draws temperature and LH curves so the phases of your cycle are easier to see. It also predicts periods, sends reminders and exports your records as a PDF to take to a doctor.
Good for: Charting temperature and ovulation tests
Keep in mind: The listing doesn't say which features stay free; the developer lists Prime plans at $9.99 a month, $19.99 a quarter or $49.99 a year.
View in the App Store
Questions and answers
Is there a free alternative to Flo or Clue?
Flo and Clue are free to download themselves, and both keep basic tracking free; Flo Premium and Clue Plus sell the deeper insights. For the essentials without a paywall, Rivula charges nothing for logging, predictions, reminders, widgets, Apple Health sync or backups, and My Cycle and Ovia have no in-app purchases at all. Period Tracker by GP Apps and Period Tracker Period Calendar are free with ads.
How accurate are period tracker apps?
They are estimates built from your own history, so they work best when your cycles are regular and you have logged several. Ovulation is harder: many apps, Apple Health included, count back about two weeks from the expected period, so the real day can be a few days off; LH tests and basal temperature help narrow it. Predictions get less reliable when cycles are irregular, after you stop hormonal birth control, after a birth and in perimenopause. Rivula shows a range, so you can see how sure it is.
Is my period data private in these apps?
It depends on the app. Check whether it needs an account, and read the App Privacy section on its App Store page, which lists what the developer collects and whether that data is linked to you. Rivula has no account and keeps your journal on your iPhone; Period Tracker Period Calendar also works without registration, and Flo offers an Anonymous Mode. Anything you sync to Apple Health is encrypted by Apple while your iPhone is locked, and end to end in iCloud with two-factor authentication.
Do I need an app if Apple Health has Cycle Tracking?
Not always. Cycle Tracking in the Health app is free, predicts your period and a six-day fertile window, and with a Series 8 or newer Apple Watch, or any Ultra, it uses wrist temperature to mark an estimated ovulation day after the fact. Separate apps add things like pattern insights, LH and temperature charts, week-by-week pregnancy content, a community or a partner mode. Many sync with Health, and Rivula can import up to three years of your history from it.
Why is Rivula first?
Rivula is made by the AppHunt team, so it takes the first place. Its spot does not come from the rating count used for places 2–10. We built it for people who want predictions without creating an account or seeing ads. Every mode, from cycle tracking and trying to conceive to pregnancy and perimenopause, is free, and you can send a partner your predicted dates by message or as a calendar file. We also have a promo code that makes Rivula Pro free for good.
How do I use the Rivula promo code?
Tap Get on the Rivula card. If you are not signed in to AppHunt you will be asked to log in, and the code appears right after. Redeem opens the App Store's own redemption screen with the code filled in.
How is the list ordered?
Places 2–10 are ordered by the number of ratings each app has in the US App Store, with one app per developer; pregnancy-only apps and companion apps for smart rings and scales are left out. The count measures how many people use an app, not a verdict on which one is better.