RhythmXKnow your rhythm. Keep it yours.
Log your cycle, tag how you feel, and see your patterns. No account, no ads, and nothing ever leaves your phone.
iPhone · iOS 18+ · Free of ads and trackers
Made for the way you actually live
From the first day to the last, RhythmX fits into your day in under a minute.
Understand your body
See which phase you're in and what to expect, with a plain-language guide for each one.
Plan with confidence
Predicted period days on a calendar, plus optional reminders the day before and the day of.
Spot your patterns
Tag symptoms, moods and notes, then watch the trends appear across your cycles.
Insights that make sense
A phase ring with today's moon, your average cycle and period length, and your next-period estimate, all at a glance.
- Charts for phase timing, tags and cervical mucus
- Today's day and phase, front and center
- Light mode in blush, dark mode in deep plum
A calendar tinted by phase
Every day colored by where you are in your cycle. Tap any day to add or review tags.
- Predicted period days shown as dashed circles
- Reminders only if you want them
- Export chosen phases as a calendar (.ics) file, only when you choose to
Tag how you feel
Symptoms, moods, notes. Add them as chips by phase, edit anytime, and look back through past cycles.
- Search and edit archived cycles
- Swipe to delete anything, instantly
- Large text and VoiceOver supported
Four phases, four moons
A moon for each stage, so your cycle reads at a glance.
Menstrual
Rest and reset. Log flow and how you feel.
Follicular
Energy builds as the cycle gets going.
Ovulation
The full moon of your cycle, at its peak.
Luteal
Winding down. Watch for mood and body shifts.
Your cycle is nobody's business but yours
Data lives on your iPhone. No third-party SDKs, no analytics, no accounts, no network calls. Built for the App Store "Data Not Collected" label.
accounts to create
ads or trackers
network requests
stored on your device
Guides
Plain-language reading on cycle tracking and privacy.