What is the best period tracker app for couples?
It depends on what you need. If you both have iPhones and he mostly wants to know how she's doing, pick Arythm. He sees her phase and simple tips, never her raw health data. If one of you is on Android, pick Clue or Flo. Both work on iPhone and Android. If you want an app cleared by the FDA as birth control, Natural Cycles is the one. If you want a playful, moon-themed app, try Stardust.
Prices and features checked October 19, 2026. Prices are US App Store prices. Apps change often, so check each listing before you pay.
Comparison table
| App | What the partner sees | Wearables and data | Platforms | US price |
|---|---|---|---|---|
| Arythm | Current phase, cycle calendar, weekly tips, a read on energy and rest (no raw numbers), how long the phase lasts, home-screen widget | Apple Health or Oura Ring, or log in the app. Reads Flo, Clue and Apple Watch data through Apple Health | iPhone only, iOS 17+ | 7-day free trial, then $3.99/month or $24/year. The partner pays; she uses it free |
| Natural Cycles (Partner View) | Daily fertility status, ovulation prediction, added temperatures. She can choose to share more | NC° Band, basal thermometer, Oura Ring, WHOOP, compatible Garmin, Apple Watch Series 8 or newer | iOS 16.7+, Android | $21.99/month or $149.99/year. Partner cost: not stated on its site |
| Clue (Clue Connect) | Period days, fertile days, ovulation and PMS in a calendar. Not mood, energy or pain | Apple Watch, Oura, WHOOP, Withings, Fitbit "and more" | iOS 18+, Android | Sharing needs Clue Plus: $9.99/month or $39.99/year. Viewing is free |
| Flo (Flo for Partners) | A view-only cycle calendar and daily insights in key phases. Not her logged symptoms or notes | Apple Watch | iOS 17+, Android | Basic partner sharing is free. Flo Premium App Store options run $1.99 to $59.99 |
| Stardust (partner invites) | "Stay in sync" with her period, TTC or pregnancy. Details: not stated on its site | Apple Watch, Oura Ring | iOS 15.2+, Android | Monthly Plan $6.99. Annual plans listed at $24.99 to $39.99 |
| Cycles (by Perigee) | Cycle info and partner tips on the current phase. Reminders, notes and personal logs stay private | Apple Health, Apple Watch | iPhone, iPad, Apple Watch (iOS 17+). Android: not stated on its site | Partner sharing is a Premium feature. Premium App Store options run $2.99 to $59.99 |
Arythm
Arythm is built for one job: helping him understand where she is in her cycle. She connects Apple Health or an Oura Ring, or logs her period in the app. If she already uses Flo, Clue or an Apple Watch, Arythm reads that data through Apple Health.
He sees her current phase, a cycle calendar, weekly tips, and how long the phase lasts. He also gets a read on her energy and rest, never raw numbers. There's a home-screen widget, so he doesn't have to open the app.
Privacy is the core. Only the phase label is shared, and it is end-to-end encrypted (AES-256-GCM, Curve25519). Raw health data never leaves her phone. Unlinking deletes the shared data. No ads, no data sales.
Price: 7-day free trial, then $3.99 a month or $24 a year. The partner pays, and she uses it free. The catch: it's iPhone only (iOS 17+), and it is not birth control.
Natural Cycles
Natural Cycles is the pick if birth control matters to you. Its App Store listing calls it a non-hormonal birth control app cleared by the FDA. Partner View gives him his own view-only app. He sees her daily fertility status, her ovulation prediction and the temperatures she adds. She decides if he sees more, like tests or logged sex, and she can turn it off any time.
It works with the most devices here: the NC° Band, a basal thermometer, Oura Ring, WHOOP, compatible Garmin devices and Apple Watch Series 8 or newer. It's on iPhone (iOS 16.7+) and Android. It's also the priciest: $21.99 a month or $149.99 a year on the US App Store.
Clue
Clue Connect shows him her period days, fertile days, ovulation and PMS in a simple calendar. He can't see her mood, energy or pain. She can share with one person at a time, and it isn't available in Clue's pregnancy mode.
She needs Clue Plus to share ($9.99 a month or $39.99 a year on the US App Store). Viewing is free, but both of you need a Clue account. Clue works with Apple Watch, Oura, WHOOP, Withings, Fitbit and more. It's on iPhone (iOS 18+) and Android, so it's a strong pick for mixed-phone couples.
Flo
Flo for Partners gives him a view-only cycle calendar and daily insights during key phases. He can't see the symptoms or notes she logs. Basic partner access is free, even if she doesn't pay for Flo. Premium adds more articles, videos and quizzes.
Flo says the feature is designed for a male-female couple for now, because it tracks one cycle at a time. It works with Apple Watch and runs on iPhone (iOS 17+) and Android. If you want to spend nothing, Flo is the easiest start.
Stardust
Stardust is the playful one, with a moon and astrology feel. Its App Store listing says you can invite partners or close friends to stay in sync with your period, trying to conceive, or pregnancy. What the partner sees exactly is not stated on its site.
It works with Apple Watch and Oura Ring for temperature. It's on iPhone (iOS 15.2+) and Android. The US App Store lists a Monthly Plan at $6.99 and annual plans from $24.99 to $39.99.
Cycles
Cycles, by Perigee, is an Apple-only app made with couples in mind. Partner sharing sends only cycle info. Her reminders, notes and personal logs stay private. A Partner Insights feature explains the current phase and how to help.
Partner sharing is part of Premium. The US App Store lists Premium options from $2.99 to $59.99. It works with Apple Health and Apple Watch on iOS 17+. Its site does not mention Android.
How to choose
- Both on iPhone, want privacy and simple tips: Arythm.
- One of you on Android: Clue or Flo.
- Want FDA-cleared birth control: Natural Cycles.
- Want to pay nothing: Flo's basic partner sharing.
- Want a fun, moon-themed app: Stardust.
Frequently asked questions
Can my boyfriend see my period tracker?
Only if you invite him. Arythm, Natural Cycles, Clue, Flo, Stardust and Cycles all have a partner feature that you turn on yourself. Each one shares a different amount. Arythm shares only your phase. Clue shares period, fertile, ovulation and PMS days. Natural Cycles shares your daily fertility status and temperatures. You can stop sharing at any time in each app.
Can my partner see my symptoms or notes?
In most of these apps, no. Flo says your partner can't see the symptoms or notes you log. Clue says your connection can't see mood, energy or pain. Cycles says your reminders and notes stay private. Arythm shares only the phase label. Your partner gets a read on energy and rest, never raw numbers.
Is there a free period tracker app for couples?
Flo is the closest. Basic Flo for Partners works for users who don't pay for Flo. With Clue, viewing is free, but the person sharing needs Clue Plus. Arythm has a 7-day free trial, then $3.99 a month or $24 a year. The partner pays, and she uses it free.
What is the best period tracker for an Android and iPhone couple?
Pick Clue, Flo, Natural Cycles or Stardust. All four are on both the App Store and Google Play. Arythm is iPhone only. Cycles is on the App Store, and its site does not mention Android.
Can a period tracker app be used as birth control?
Most can't. Natural Cycles says it is a non-hormonal birth control app cleared by the FDA. Clue says its fertile window should not be used to prevent pregnancy. Arythm is for understanding each other, not for preventing pregnancy. Talk to a doctor about birth control.
Is it safe to share cycle data with a partner?
It depends on what the app sends and where it goes. Look for apps that let you pick what is shared and stop sharing in one tap. In Arythm, raw health data never leaves her phone. Only the phase label is shared, and it is end-to-end encrypted. Unlinking deletes the shared data. Arythm has no ads and sells no data.
Try Arythm
If you're both on iPhone, Arythm is the simplest way for him to know how she's doing, without seeing her health data.
This guide is for general information, not medical advice. Arythm is not birth control.