The Best Period Tracker Apps of 2026

Last updated 26 October 2026, by the Hello Phase team. Prices and ratings re-checked 26 October 2026.

How we picked the apps

We gave the most weight to what you get free without an account or ads, then to privacy labels, account rules and any FTC or state action, then to price, store ratings and support for both iPhone and Android. Apps with no update in 18 months were left out.

Side by side

The apps

Which period tracker app is most accurate?

No app can tell you your next period or ovulation day for certain, since only 12.4% of app users in a large study had a 28-day cycle and the NICHD says ovulation can happen 10 to 21 days after a period starts. Apps that add temperature, as Natural Cycles, drip and Apple Watch do, have more to work with. For hormones measured from urine, see the Hello Phase guide to the best hormone tracker apps.

Which period app is best for irregular periods?

On Android, Hello Phase widens its predicted date range when your cycles vary and lets you pause predictions after a change such as pregnancy, though it keeps predicted cycle lengths between 21 and 45 days. On iPhone, Apple Health can flag irregular cycles, infrequent or prolonged periods and persistent spotting, and Ovia supports irregular cycles for free if you accept an account.

Is a period tracker birth control?

Usually not, and Hello Phase is not a contraceptive. The exception is Natural Cycles, which the FDA allowed to be marketed as birth control in August 2018 with a failure rate of 1.8% with perfect use and 6.5% with typical use, as STAT News reported, and Clue received FDA clearance for a product called Clue Birth Control in February 2021. If you want to avoid pregnancy, talk with a clinician and use a method cleared for that purpose.

Are period tracker apps safe after Roe v. Wade?

It depends on where your data lives. Apps with an account usually sync your log to company servers, while Hello Phase, drip, Euki, My Cycle and Period Calendar Period Tracker work with no account, and Apple says that with two-factor authentication it cannot read Health data backed up to iCloud. We cannot tell you how any state's law applies to you after Dobbs v. Jackson Women's Health Organization overruled Roe v. Wade in June 2022.

Privacy labels are a starting point rather than proof. Stardust tells Google Play it shares no data, yet TechCrunch reported in July 2026 that Mozilla researchers found it sending health data to RudderStack, AppsFlyer and Facebook, and Mozilla's 2026 study, as Digital Health Insights reported, showed that a search for abortion providers in the in-app browser of Planned Parenthood's Spot On sent along the user's age and last period date. Our guide to the most private period tracker apps goes further.

Apps we left out and why

Period Tracker Period Calendar by ABISHKKING says data is "never uploaded or shared" while its Apple label lists data used to track you, and Clover's Data safety section lists data shared for advertising. We also left out Stardust after the Mozilla findings above, Premom over a proposed 2023 FTC order, Glow and its Eve app after Glow paid $250,000 in a 2020 California settlement over security weaknesses, and Femometer's Android app and Kindara's iOS app for going more than 18 months without an update.

How to choose

On Android, start with Hello Phase, or Period Calendar Period Tracker if ads don't bother you. On iPhone, use Apple Health or My Cycle, and pick Clue if you switch between phones. Our guides to free period tracker apps and Flo alternatives cover cost and switching.

Questions people ask

Try Hello Phase

Hello Phase is free on Android with no account and no ads. For PMS, PMDD or cycle syncing, see the Hello Phase guides to the best PMDD tracker apps and the best cycle syncing apps.

Sources

Store listings for every app are linked from its card above and were checked on 26 October 2026.

1. Supreme Court of the United States, Dobbs v. Jackson Women's Health Organization, No. 19-1392, decided June 24, 2022
2. FTC, order finalized with Flo Health, June 2021
3. FTC, proposed order barring Premom from sharing health data for advertising, May 2023
4. California Attorney General, settlement with Glow, Inc., September 2020
5. CNBC, jury rules Meta violated law in period tracking app data case, August 2025
6. Flo help center, free and paid features
7. Flo newsroom, Anonymous Mode
8. Clue, why you need an account to use the newest version of Clue
9. FDA 510(k) K193330, Clue Birth Control, February 2021
10. FDA De Novo DEN170052, Natural Cycles decision summary
11. STAT News, FDA clears Natural Cycles app as contraception, August 2018
12. FDA 510(k) K231274, Natural Cycles, August 2023
13. FDA 510(k) K250561, Natural Cycles, March 2025
14. Natural Cycles help center, What is Go Anonymous
15. Apple Support, Cycle Tracking in the Health app
16. Apple, Health app and privacy
17. Apple Platform Security, protecting access to Health data
18. The Washington Post, tracking your pregnancy with an app may be more public than you think, April 2019
19. Vice, Stardust privacy policy and law enforcement requests, 2022
20. TechCrunch, Stardust shares users' health data with analytics firm, says Mozilla research, July 2026
21. Digital Health Insights, Mozilla report on privacy gaps among period tracking apps, 2026
22. CyberInsider, Mozilla study ranks Euki as the most private period tracker, 2026
23. Planned Parenthood, Spot On period tracker
24. Euki, official site
25. drip, official site and source code on GitLab
26. Setton R et al. 2016, accuracy of web sites and apps for predicting the fertile window, Obstet Gynecol
27. Soumpasis I et al. 2020, real-life insights on menstrual cycles and ovulation, Hum Reprod Open
28. Bull JR et al. 2019, menstrual cycle characteristics from over 600,000 cycles, npj Digit Med (authors from Natural Cycles)
29. NICHD, About menstruation
30. Hormone Tracker - Hello Phase on Google Play
31. Hello Phase privacy policy

Hello Phase is for tracking and learning about your cycle. It is not a contraceptive and it does not diagnose medical conditions. Nothing on this page is medical or legal advice.