Best Period Tracker Apps for 2027

For 2027, the right period app depends on the job you give it. If you want hormone-free contraception, Natural Cycles is the winner and the only FDA-cleared option here. If you simply want to log and predict your cycle, iPhone owners should look at the tracker Apple builds into the Health app, a finalist, while Android users and couples should look at Clue, the other finalist.

The approach for 2027

This edition is about the app you will rely on for the next twelve months, choosing only among apps currently in the US app stores. Scoring uses the weighted measures on our judging page, with two read especially strictly. Evidence means what a regulator has reviewed, not what a marketing page promises, and it decides who wins. Privacy and control over your data count for more than elsewhere on this site, because a year of cycle logs is a detailed record of someone’s sexual and reproductive life. The assessments are drawn from company documentation, regulatory filings and the FTC’s public record, not from personal use.

Three developments from 2026 worth knowing

Contraception got easier to live with. Natural Cycles’ new algorithm, cleared in July, is designed to keep its effectiveness while flagging fewer days as needing protection, and the list of devices that can feed it temperature data kept growing.

Trackers started watching for life stages. Apple’s September update added a notification for people 40 and older whose logged cycles suggest perimenopause, while Clue Plus includes a perimenopause guide and Natural Cycles has a perimenopause mode.

Privacy promises became more specific. Flo, which settled FTC charges over data sharing in 2021, now publishes ISO certifications and offers an Anonymous Mode; Clue promises its health data will not be sold or handed to authorities; and two nonprofit or open-source apps avoid collecting data at all.

Winner: Natural Cycles

Choose Natural Cycles for 2027 if you want birth control without hormones and will take a temperature reading every day. The FDA first authorized it in 2018 via a De Novo decision, creating a new category for contraceptive software, and the company reports that it is 93 percent effective in typical use and 98 percent effective when used exactly as intended. Its sixth FDA clearance, announced July 27, 2026, covers a rebuilt algorithm that the company says maintains that safety profile while marking more days Green, meaning no protection needed. In practice, that should mean fewer days when the app tells you to abstain or use a backup method.

What you measure with is now flexible. Natural Cycles sells its own NC Band and supports Apple Watch, Garmin, Oura and WHOOP, and a WHOOP promotion that started in August gives eligible newcomers twelve months of the subscription. The app also covers planning a pregnancy, following one, the postpartum months and perimenopause, so one subscription can follow you through several stages.

Who should switch to it: people already logging temperature with a ring or watch who want that data to count for contraception. Who should not: anyone under 18, people using hormonal contraception, anyone unwilling to pay a subscription, and anyone who needs STI protection, which no app provides.

Finalist: Cycle Tracking in Apple Health

Apple’s tracker heads into 2027 stronger than before. Alongside period and fertile window predictions and logging for symptoms and cycle factors, it can flag cycles that are irregular, infrequent or prolonged, and persistent spotting, using only your own history. The new perimenopause notification, for people 40 and older, comes with symptom logging and educational resources. Recent Apple Watch models, Series 8 onward plus SE 3 and Ultra, add retrospective ovulation estimates from overnight wrist temperature, a feature Apple describes as not intended for medical purposes.

It is the most private choice for iPhone owners who do not need contraception. Health data stays encrypted on your iPhone, and turning on two-factor authentication extends that to end-to-end encryption in iCloud. Apple warns against using Cycle Tracking as contraception or for diagnosis, and the feature is available on iPhone, iPad and Apple Watch.

Finalist: Clue

For Android owners and couples, Clue is the tracker to pick. Its free tier gives you basic predictions and essential cycle statistics, and Clue Plus unlocks deeper analysis, a perimenopause guide, a pregnancy mode, Clue Conceive for trying to get pregnant, and Clue Connect, which lets a partner see your cycle. Clue’s pledge on data goes further than most commercial trackers: no sale of health data, ever, and no handing it to authorities, backed by German and EU privacy standards. Clue is a tracker, not contraception.

Commended: Flo

Flo’s free version is generous: it predicts periods and ovulation, logs 80-plus symptoms and events and sends custom reminders. Premium adds a symptom checker that compares your self-assessment with symptoms of polycystic ovary syndrome and endometriosis, plus a six-month report you can take to a doctor on iOS. Weigh its history: the FTC’s 2021 order followed allegations that Flo shared users’ health information with outside companies, and Flo’s answer since then has been Anonymous Mode, ISO 27001 and 27701 certifications and a privacy policy stating it will never sell your data.

Commended: Euki

Euki is built by an independent nonprofit for people who want information without a data trail. Beyond period prediction and symptom logging, it lists telehealth clinics, abortion support hotlines and free confidential legal support organizations, and offers a quiz to help choose a contraceptive method. Euki says its next-period predictions sharpen the more you log, and a Cycle Summary shows your average cycle length and how long each period lasted. No charge, open code, and two languages, English and Spanish.

Commended: drip

This open-source app is for people who want to see exactly how their fertility signs are interpreted. It offers period-only tracking or symptothermal fertility tracking, promises transparent calculations, keeps entries on your phone and is funded by public and nonprofit backers including Germany’s education and research ministry and Mozilla. It is a tracker, not an FDA-cleared contraceptive.

The six apps compared

App	Award	What it is	How it is paid for	Data safeguard
Natural Cycles	Winner	Cleared by the FDA as contraception	Annual or monthly subscription	Maker cites FDA cybersecurity rules and no need to sell data
Apple Cycle Tracking	Finalist	Tracker; Apple says not for contraception	Part of the Health app	Encrypted on device, end to end with 2FA
Clue	Finalist	Tracker	Free tier, Clue Plus upgrade	Pledge against selling or handing over data
Flo	Commended	Tracker	Free tier, Premium upgrade	Anonymous Mode and ISO certifications
Euki	Commended	Tracker with health resources	Free, no paywalls	Collects no personal data, by its account
drip	Commended	Fertility awareness tracker	Not stated by drip	Entries stay on your device

Matching an app to your goal

1. Preventing pregnancy without hormones: Natural Cycles, chosen together with a clinician.
2. Tracking on an iPhone, especially in your 40s: Apple Cycle Tracking.
3. Tracking on Android or sharing with a partner: Clue.
4. Getting the most from a free app, with privacy settings switched on: Flo with Anonymous Mode.
5. Leaving no account or data behind: Euki or drip.

Planning a pregnancy in 2027? Our 2027 pregnancy app picks cover the months after a positive test, and temperature-sensing jewelry is reviewed among the smart rings for 2027.

Before you rely on any cycle app

Judge each app by the task a regulator or its own maker says it is fit for. Natural Cycles earns the 2027 prize because the FDA has examined its evidence for preventing pregnancy and it keeps improving within that framework. The trackers below it are excellent at logging and predicting, but none of them should stand in for contraception. A year of honest logs is still valuable: patterns in cycle length, spotting or symptoms are exactly what a clinician will ask about. If you are choosing a birth control method, or if an app flags irregular cycles or possible perimenopause, talk it through with a doctor, nurse practitioner or midwife.

<a href="https://innovationprizes.org/2027/best-period-tracker-apps/"><img src="https://innovationprizes.org/badges/2027-best-period-tracker-apps-winner.svg" alt="Innovation Prizes 2027 Winner: Period Tracker Apps" width="160" height="160"></a>

<a href="https://innovationprizes.org/2027/best-period-tracker-apps/"><img src="https://innovationprizes.org/badges/2027-best-period-tracker-apps-finalist.svg" alt="Innovation Prizes 2027 Finalist: Period Tracker Apps" width="160" height="160"></a>

<a href="https://innovationprizes.org/2027/best-period-tracker-apps/"><img src="https://innovationprizes.org/badges/2027-best-period-tracker-apps-finalist.svg" alt="Innovation Prizes 2027 Finalist: Period Tracker Apps" width="160" height="160"></a>