Arythm: Couples Period Tracker

She's tired of explaining her cycle. You're tired of guessing. Same problem. Arythm syncs the current phase of her cycle to your phone — encrypted, partner-only. You see where she is and how to actually help, so she's supported without the emotional labor of explaining it again. Free for 7 days. HOW IT WORKS • She connects Apple Health or Oura — or just logs her period right in Arythm • Her current cycle phase is encrypted on her device, end-to-end • Only you see it — never the cloud, never us, never anyone else • Send a quick voice memo or a nudge when she needs you • You both get tips, body info, and a read on her energy NO RING REQUIRED • A simple shared calendar — she taps to log her period, that's it • Arythm predicts her phase from her history, even with no wearable at all • Already on Oura or Apple Health? It folds that in automatically • One calendar, however she tracks — logged days and predicted days, clearly shown BUILT FOR THE DAYS YOU CAN'T READ HER • No more "I'm fine" when she's not fine • You stop guessing why she's tired today • She stops having to translate her body into your language • You actually become helpful instead of confused • Built for the days she needs you to just know WHAT YOU SEE AS A PARTNER • Her current cycle phase, updated automatically • A calendar of where she's been and what's coming • Tips for how to actually be supportive this week • A read on her energy and rest — never raw numbers • How long the current phase will last PRIVACY IS THE PRODUCT • End-to-end encrypted (AES-256-GCM, Curve25519 key exchange) • No raw health data leaves her device • The server only ever sees an unreadable blob — never your actual cycle data • When you unlink, all shared data is deleted immediately • No ads, no data sales, no third-party tracking YOUR RING ALREADY KNOWS • Best with Oura — temperature-based phase detection, no daily logging needed • Works with Apple Watch cycle tracking too, through Apple Health • Already use Flo, Clue, or Apple Health? Arythm reads from those automatically • No wearable? Her own logging works just as well — nothing's gated behind a ring PREMIUM • Free for 7 days — see the whole thing before you pay a cent • Then $3.99/mo or $24/yr — two bucks a month if you go yearly • Partner pays, sharer has free access • Cancel anytime She doesn't have to explain. You don't have to guess. Arythm is the quiet, private way two people stay in sync. TERMS Auto-renewable subscription — $24/year or $3.99/month. Payment is charged to your Apple ID at purchase confirmation. It renews automatically unless canceled at least 24 hours before the current period ends; manage or cancel anytime in your App Store account settings. Terms of Use (EULA): https://arythm.app/terms Privacy Policy: https://arythm.app/privacy