How can my partner see where I am in my cycle?
Use a period tracker with a partner view. Arythm is built only for this: she connects Apple Health or an Oura Ring, or logs her period in the app, and her partner sees her current phase and tips on his iPhone. Only the phase is shared, encrypted end to end, never raw health data. If she already tracks in an app she loves, check its own partner feature first. Natural Cycles, Clue and Stardust all have one. Arythm fits couples who want sharing to be the whole point, with nothing else to set up.
How Arythm works
- She connects Apple Health or an Oura Ring, or just logs her period in Arythm.
- Her current phase is encrypted on her phone before it is sent.
- She shares a 6-character link code, and he links on his phone.
- He sees her phase on a home screen widget, no app opening needed.
What the partner sees
- Her current cycle phase, updated automatically
- A calendar of where she has been and what is coming
- Tips for how to be supportive this week
- A read on her energy and rest, never raw numbers
- How long the current phase will last
Privacy
- End-to-end encrypted (AES-256-GCM with a Curve25519 key exchange).
- No raw health data leaves her phone. Our server only stores an unreadable blob.
- When you unlink, all shared data is deleted right away.
- No ads, no data sales, no third-party tracking.
What it works with
- Oura Ring, for temperature-based phase detection with no daily logging
- Apple Watch cycle tracking, through Apple Health
- Flo, Clue or any app that writes to Apple Health
- No wearable at all: she logs her period and Arythm predicts her phase from her history
How much does Arythm cost?
Arythm is free to download, with a 7-day free trial. After that it is $3.99 a month or $24 a year, about $2 a month. The partner pays. She uses it free. Cancel anytime in your Apple ID settings.
Questions people ask
Does my partner need an Oura Ring or Apple Watch?
No. She can log her period in Arythm and it predicts her phase from her history. Oura and Apple Watch data make it more exact, but nothing is locked behind a wearable.
Can Arythm see my health data?
No. Her phase is worked out on her phone and encrypted before it is sent. Our server only stores an unreadable blob. Raw health data never leaves her phone.
Does Arythm work on Android?
Not yet. Both of you need an iPhone.
Who pays for Arythm?
The partner who views the phase pays. The person who shares her cycle uses Arythm free.
What happens if we unlink?
All shared data is deleted right away. Either of you can unlink at any time.
Can Arythm be used for birth control?
No. Arythm is for understanding and support, not for preventing pregnancy.
Guides
iPhone app, iOS 17 or later. On the App Store since April 28, 2026. Current version 1.01. Facts as of .