How we make this list: we compare pricing pages, product documentation and public user reviews. Rankite is independent; if a vendor ever pays for a featured spot, that listing is clearly labeled Partner.
Key takeaways
- Flo offers the deepest feature set and the largest community, which makes it the best period tracking app for most people who want everything in one place.
- Clue is the strongest pick if privacy matters most, with GDPR-governed data controls and a science-first design built in Berlin.
- Euki is the only fully private option here: a nonprofit app that stores everything on your phone and asks for no account at all.
- If you are trying to conceive, Premom and Glow beat general trackers because they are built around ovulation prediction, not just period dates.
- Every app on this list has a usable free tier, so the best free period tracker app comes down to which trade-offs you accept, not whether you pay.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Flo | Deepest features and community | See website | Yes |
 Clue | Privacy-first, science-backed tracking | See website | Yes |
 Ovia | Full journey from cycle to menopause | See website | Yes |
 Glow | Data-driven fertility predictions | See website | Yes |
 Premom | Ovulation test strip scanning | See website | Yes |
 Stardust | Fun daily tracking ritual | See website | Yes |
 WomanLog | Detailed symptom logging | See website | Yes |
 Euki | Maximum privacy, no account | Free | Yes |
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The best period tracker apps
Starting priceSee website
Free planYes
Flo is the app most people mean when they ask what is the best period tracker app. It has the largest user base in the category, and that scale feeds both its prediction models and its community features. Logging is quick, the calendar view is clear, and the app explains what is happening in your body in plain language instead of medical jargon.
The free tier covers period and ovulation predictions, symptom logging and reminders, which is enough for basic cycle tracking. Flo Premium adds an AI health assistant, deeper cycle insights and content spanning pregnancy and perimenopause. The honest catch is trust. Flo's parent company settled a high-profile case over past sharing of health data with third parties, and while its current policies are stricter, privacy-conscious users should read the settings carefully and consider the anonymous mode option.
What we like- Largest content library and community in the category
- AI-based predictions that adapt to irregular cycles
- Covers pregnancy and perimenopause, not just periods
Watch out for- Settled a major data-sharing case in its past
- Pushes the paid tier aggressively
Starting priceSee website
Free planYes
If data privacy shapes your choice, start with Clue. The Berlin-based app takes a science-first approach to cycle tracking, and its privacy record is the strongest among the mainstream options. You can separately control data sharing for research, analytics and advertising, which is rare in this category. Mozilla's 2026 privacy review of period apps scored Clue 8 out of 10, second only to the nonprofit Euki.
Clue's free tier handles period prediction, PMS tracking and reminders well. The interface avoids pink overload and cutesy language, which many users prefer. Clue Plus adds deeper predictions and educational content. The trade-off is accuracy patience: like every tracker, its predictions only get good after a few months of consistent logging, and the app offers less hand-holding than Flo for beginners.
What we like- Granular privacy controls under GDPR
- Clean, clinical design with no gendered cliches
- CE-marked as a medical device in Europe
Watch out for- Full predictions and insights sit behind Clue Plus
- Community features are thinner than Flo's
Starting priceSee website
Free planYes
Ovia treats cycle tracking as one chapter of a longer health story. Instead of stopping at period prediction, the app follows you through trying to conceive, pregnancy week by week, postpartum recovery and perimenopause. That continuity is its main selling point: you do not outgrow it when your goals change.
The consumer app is free and genuinely useful on its own, with personalized insights based on what you log. Through employer health plans, Ovia adds unlimited messaging with a care team of registered nurses, midwives and coaches, available every day of the year. Syncing with Apple Health and Google Fit pulls in sleep and activity data for a fuller picture. The catch is geography and access: the care-team layer depends on employer coverage, which is mostly a US benefit, and the app's breadth can feel like overkill for simple period tracking.
What we like- One app for cycle, fertility, pregnancy, postpartum and menopause
- Access to a real care team of nurses and coaches
- Syncs with Apple Health and Google Fit
Watch out for- Richest experience is tied to employer benefit programs
- Less relevant if you only want simple period dates
Starting priceSee website
Free planYes
Glow built its name as a fertility tracker first and a period tracker second, and that focus still shows. Its predictions for ovulation and fertile windows draw on one of the largest datasets in the category, which helps if your main goal is timing intercourse around conception. Samsung once partnered with Glow's developers for the women's health feature in Samsung Health, a sign of how seriously the industry takes its data models.
The free tier includes period and ovulation tracking plus community forums where users discuss everything from TTC to endometriosis. A companion app lets a partner follow along. On the downside, the free experience includes advertising, and Glow's privacy record has drawn criticism in the past. If you are choosing mainly on privacy, Clue or Euki deserve a longer look.
What we like- Strong ovulation and fertility predictions from a large dataset
- Active community forums
- Partner app keeps both people in sync
Watch out for- Free tier includes ads
- Privacy history is mixed compared with Clue or Euki
Starting priceSee website
Free planYes
Premom is the only app here built around a physical product. It comes from the Easy@Home brand of ovulation and pregnancy tests, and its standout feature is the digital test reader: photograph an ovulation strip and the app measures your LH levels to pinpoint peak fertility. For anyone already buying test strips each month, that integration removes a lot of guesswork.
Beyond the scanner, Premom offers automatic basal body temperature charting, a PCOS self-assessment, and Predad, a partner app that shares cycle updates and reminders. The company claims over 1.5 million pregnancies among users. The honest limitation is scope. If you are not trying to conceive, most of Premom's best features sit idle, and a simpler tracker will serve you better. Expect frequent prompts to upgrade to Premom Premium.
What we like- Phone camera reads ovulation test strips and quantifies LH levels
- Automatic BBT charting with synced thermometers
- PCOS-specific tools and partner app
Watch out for- Built for trying to conceive, so it is overkill for simple period tracking
- Premium upsells appear often
Starting priceSee website
Free planYes
Stardust is the tracker you open because you want to, not because a notification nagged you. It maps your cycle to moon phases and hormone stages, serves daily insights with a dash of folklore, and generally feels more like a ritual than a medical tool. For people who have abandoned drier apps out of boredom, that difference matters.
Practical features sit underneath the style: period and ovulation predictions, symptom logging, cycle syncing with a partner or close friends, and a pregnancy mode with weekly AR visualizations. The serious caveat is privacy. Mozilla's 2026 review gave Stardust 2 out of 10 after finding it shared birthdates, symptoms, moods and pregnancy status with an analytics company. If you choose Stardust for the experience, go in with your eyes open about the data trade.
What we like- Moon-phase and hormone-stage content makes daily logging enjoyable
- Cycle sharing with a partner or friends
- Pregnancy mode with AR baby-size visuals
Watch out for- Mozilla's 2026 review found it shared sensitive data with an analytics firm
- Astrology framing will not suit everyone
Starting priceSee website
Free planYes
WomanLog is for people who log everything. Where most apps offer a dozen symptoms, WomanLog offers more than a hundred, plus weight, basal body temperature, moods, pill intake, cervical mucus and detailed charts. It supports both regular and irregular cycles with standard and advanced prediction modes, and a Simple Mode strips it back to basics if the full view overwhelms you.
The app has been around since the early App Store era and has passed 10 million installs on Android alone. Password protection, multi-device sync and partner sharing are all included. The downsides are visible on first launch: the design feels a decade old, the free version carries ads, and Apple's privacy labels indicate some data is linked to your identity. It remains a solid pick for detailed health journaling on a budget of zero.
What we like- Tracks 100+ symptoms plus weight, BBT, moods and medications
- Password protection and partner data sharing
- Long track record with 10M+ installs
Watch out for- Interface looks dated next to newer apps
- Free version shows ads
- Apple privacy labels show some data linked to identity
Starting priceFree
Free planYes
Euki exists for one reason: a period tracker that does not track you. Built by the nonprofit Women Help Women with research support from Ibis Reproductive Health, it is now an independent 501(c)(3) organization. Nothing leaves your phone. There is no account, no cloud backup and no third-party analytics, which is why Mozilla gave it a perfect 10 out of 10 in its 2026 privacy review, the highest score of any app tested.
Inside the app you get period prediction, symptom tracking, appointment and medication reminders, and unusually thorough sexual and reproductive health information covering contraception, STIs and abortion resources. PIN protection and disguisable icons add safety for users in difficult situations. The trade-off is real: with no sync, losing your phone means losing your history. Euki suits anyone who ranks privacy above convenience.
What we like- All data stays on your device, no account required
- PIN protection and scheduled data deletion
- Inclusive, evidence-based sexual health information
Watch out for- No cloud sync, so a lost phone means lost data
- Smaller nonprofit team ships updates more slowly
How we chose
We started with the apps that dominate real-world usage and discussion: Flo, Clue, Ovia and Glow, plus widely recommended alternatives from app store charts, Reddit threads and health publications. Each candidate had to be actively maintained in 2026, available on both iOS and Android, and genuinely focused on cycle tracking rather than a side feature of a fitness app. We read each vendor's current pricing and privacy pages, checked Mozilla's 2026 privacy review of period tracking apps, and weighed public reviews on the app stores and health sites. No vendor paid for placement, and we did not count marketing claims about accuracy that no independent study backs up.
What to check before you download
Prediction quality depends on your data, not the logo. Every app here needs two to three months of consistent logging before its forecasts beat a paper calendar, and irregular cycles take longer. If your cycles vary widely, favor apps with advanced prediction modes like Flo, Clue or WomanLog over simpler ones.
Decide what you are actually tracking. Trying to conceive calls for ovulation tools like Premom or Glow. Managing PMS or spotting health patterns calls for detailed symptom logging like WomanLog or Clue. Just wanting to know when your period arrives is the easiest job, and any free tier on this list handles it.
Check the privacy policy before you create an account, not after. Look for where data is stored, whether it is sold or shared with advertisers, and whether you can delete it. Euki keeps everything on your device. Clue lets you opt out of research and advertising uses separately. Flo offers an anonymous mode. If an app's policy is vague on these points, treat that as an answer.
Finally, confirm practical details: iOS and Android availability, reminder customization, data export if you ever switch apps, and whether the free tier nags you with ads or locks predictions behind a paywall. Most paid tiers cost less than a streaming subscription, but none is required to get value.
Your cycle data and privacy
Period tracking apps hold some of the most sensitive data a phone can carry: cycle dates, symptoms, sexual activity, pregnancy status. In 2026, Mozilla partnered with researchers from Harvard's Berkman Klein Center and the University of Illinois to test six popular apps, and the spread was wide. Euki scored a perfect 10 out of 10 for keeping everything on-device. Clue scored 8, Flo 7, Period Calendar 6, Planned Parenthood's Spot On 5, and Stardust just 2 after researchers caught it sharing detailed health data with an analytics firm.
The practical lesson is not that every mainstream app is unsafe. It is that defaults differ enormously, and a few minutes in the settings changes your exposure. Turn off advertising identifiers, decline optional data sharing, use anonymous or local-only modes where offered, and prefer apps that let you delete your data outright. If you live somewhere with legal risk around reproductive health, the local-only design of Euki is worth the inconvenience of manual backups.
Frequently asked questions
What is the best period tracker app?
There is no single winner. Flo suits most people because of its features and community, Clue suits privacy-conscious users, and Euki suits anyone who wants zero data collection. Match the app to your priority: features, privacy or fertility focus.
Are free period tracker apps accurate?
Reasonably, once trained on your data. Predictions improve after two to three months of consistent logging. No app here is a medical device, and none should replace a doctor's advice for diagnosing cycle problems.
Can I use a period tracker as birth control?
No. None of these apps is approved or designed as contraception, and their makers say so explicitly. Calendar-based prediction alone is not a reliable way to prevent pregnancy.
Is my period data safe in these apps?
It depends on the app and your settings. Euki stores everything on your device. Clue and Flo offer meaningful privacy controls. Stardust scored poorly in Mozilla's 2026 review. Always read the privacy policy and disable optional sharing.
Do I need to pay for a period tracker?
No. Every app on this list has a free tier that covers period prediction and basic logging. Paid tiers add deeper insights, AI assistants and ad-free use, which are nice but not required.
Which app is best for irregular periods?
Flo, Clue and WomanLog handle irregular cycles best because their prediction models adapt to varying cycle lengths and their logging is detailed enough to spot patterns. Expect predictions to take longer to stabilize than with regular cycles.
Sources we checked (10)
- https://en.wikipedia.org/wiki/Flo_(app
- https://techsavvyed.co.uk/stardust-flo-and-other-popular-period-trackers-flunk-mozillas-latest-privacy-test/
- http://go-go-gaia.com/blog/flo-vs-clue-vs-stardust.html
- https://www.oviahealth.com/join/
- https://floriva.app/compare/versus/floriva-vs-euki
- https://eukiapp.org/euki-blog/re-launch
- https://play.google.com/store/apps/details?id=com.stardust.app&hl=en
- https://play.google.com/store/apps/details?id=com.womanlog&feature=top-free
- https://apps.apple.com/us/app/premom-ovulation-tracker/id1279295922
- https://www.myimperfectlife.com/feature/period-tracker-apps
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has spent more than a decade helping SaaS and e-commerce brands grow through search. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.