What's the best free period tracker app?

It depends what “free” has to mean. If you never want to pay, use Apple’s Cycle Tracking on iPhone, or Euki or Drip, which have no paid tier at all. If you want a full iPhone tracker where predictions aren’t held back, we’d pick Plum, which we make. Its period, fertile window and ovulation predictions come with the app at no cost, along with reminders, birth control tracking and private groups, and there are no ads. Clue and Flo both predict your period for free, but each keeps sharing and its deeper features for subscribers.

How we chose

We make Plum, and it’s one of the six apps here. There are no affiliate links. We read every company’s own pages and its US App Store listing on October 12, 2026, and each claim about another app links to its source at the bottom. Where a source didn’t say, we wrote “not stated”. We didn’t quote prices, since they change by country.

For each app we sorted features into what you get at no cost and what needs a subscription. Then we checked the App Store label for what the free version costs you in data instead of money.

Plum, for a full iPhone tracker with predictions included

Plum runs on iPhone only. Without paying, you get logging that takes a tap or two, with 27 things to track in four groups, from flow and pain to mood, sleep, discharge and ovulation tests. You get the calendar and predictions of your next period, fertile window and ovulation, which adjust as you log. You get reminders before your period and before ovulation, and birth control tracking for seven methods, with pill, patch, ring and shot reminders. You also get private groups, where friends see each other’s period days on one timeline while symptoms and moods stay private.

Plum Premium is a monthly or yearly subscription. It adds insights and the full set of more than 50 phase tips, and without it you still get one full tip a day. Plum has no ads, never sells your data and never asks to track you. Your history is stored encrypted on Plum’s servers with a copy on the phone, under an Apple or Google sign-in, and you can delete it in the app. There’s no Android version and no Apple Health sync.

Apple Cycle Tracking, for nothing to download or pay

Every iPhone has Cycle Tracking in the Health app. You can log period days, flow, symptoms, spotting and basal body temperature. It predicts your period and fertile window, notifies you before each, can flag a possible cycle deviation, and exports your history as a PDF. It comes with the phone, so there’s no subscription and no paid tier. You can log from an Apple Watch too.

Euki, for free with nothing leaving your phone

Euki says it’s 100% free with no paywalls, paid for by donations to the US nonprofit that runs it. It doesn’t collect your data, so there’s no account, and its App Store label says Data Not Collected. It predicts your next period once you’ve tracked for two months. The trade-offs are in its own FAQ. There’s no cloud backup, and fertility tracking is limited to custom notes for now. It’s on iPhone and Android in English and Spanish.

Drip, for free and open source with fertility charting

Drip is an open-source app whose site says everything you enter stays on your device. Its App Store listing is free with no in-app purchases, and on Android you can install it from Google Play or as a direct download. After three complete cycles it predicts your next three period starts. If you chart temperature and cervical mucus, it can show fertile days by the symptothermal method. Its FAQ says it won’t guess fertility from bleeding dates alone, which is an honest choice.

Clue, for a free tier you can build on

Clue runs on iPhone and Android, and its help centre says the free version will always be available. Free gets you an account, essential cycle statistics and basic predictions. Several reminders are listed, and the one for an approaching fertile window is marked as Clue Plus. Clue Plus adds predictions up to 12 months ahead, Clue Connect sharing, extra analysis, BBT charts, the full content tab, and modes for conceiving, pregnancy and perimenopause. Its App Store label lists Identifiers under Data Used to Track You.

Flo, for free predictions and a community

Flo is on iPhone and Android. Its own comparison table gives free users period and ovulation predictions, symptom tracking, a calendar, cycle history, the Secret Chats community and Anonymous Mode. Flo Premium holds the health library, Health Assistant, Symptom Checker, cycle trends, a doctor’s report, detailed pregnancy tracking and Flo for Partners. Its App Store label lists Purchases, Location, Identifiers and Usage Data under Data Used to Track You.

What each free version includes

What to look for in a free period tracker

• Find out which predictions are free. A period date is common. A fertile window, ovulation day or longer forecast is where free tiers start to differ.
• Check the reminders. A tracker you forget to open doesn’t help, and some apps charge for some reminders.
• Read the tracking label. An app can cost no money and still share data with advertisers. The App Store label shows it before you install.
• Decide if you need a backup. Apps with no account are the most private, and they can’t restore your history on a new phone.
• Treat every fertile window as an estimate. None of these apps is contraception. Our fertile window guide explains why.

If you’re on iPhone and want more detail, our best period tracker for iPhone guide goes further on Apple Watch, backups and privacy labels.

Sources

• Plum Period Tracker & Diary on the App Store
• Apple, Log menstrual cycle information in Health on iPhone
• Apple, View menstrual cycle predictions and history in Health on iPhone
• Euki home page, Euki FAQs and Euki on the App Store
• Drip home page, Drip FAQ and Drip on the App Store
• Clue home page, Using Clue for free, What’s included in Clue Plus and What reminders are available in the Clue app
• Clue on the App Store
• Flo home page, Flo Premium and Flo on the App Store