A beautiful, private period tracker that keeps 100% of your cycle data on your phone. No account, no cloud, no sign-up. Track your period, flow, symptoms and mood, see your fertile window and ovulation day, and get honest predictions that learn from your history.
Most period apps ask you to sign up, send your most personal health data to a server, and then nudge you toward a subscription. Petal does the opposite. Your menstrual calendar lives on your device and works offline, every core feature is free, and reminders are calm and opt-in.
PRIVATE BY DESIGN
- 100% on-device. Your cycle data never leaves your phone.
- No account, no cloud, no sign-up, ever.
- App lock with a PIN or fingerprint, plus a discreet mode that hides details in the app switcher.
- One-tap delete-all and an encrypted local backup you control.
A PERIOD CALENDAR THAT WORKS OFFLINE
- The whole period calendar works offline, on a plane or with no signal.
- Log your period and flow (spotting, light, medium, heavy) in a single tap.
- Record symptoms, mood, energy, sleep, cravings, discharge and notes.
- Add custom symptoms for whatever matters to you.
- A beautiful monthly menstrual calendar plus a signature circular cycle ring.
HONEST PERIOD AND OVULATION PREDICTIONS
- Estimates for your next period, fertile window, ovulation day and PMS days.
- Every prediction shows its range and confidence, so you know how sure it is.
- An irregular period tracker that stays honest instead of pretending to be certain.
- The more you log, the better your period tracker gets.
INSIGHTS THAT COMPOUND
- Average cycle length, period length, variability and trends.
- Symptom, PMS and mood patterns across each phase of your menstrual cycle.
- Full cycle history and a doctor-ready PDF health report you can share.
MODES FOR EVERY STAGE
- Tracking mode for everyday cycle awareness.
- Trying-to-conceive mode with a fertile window calculator, a basal body temperature chart and ovulation-test logs.
- A basic pregnancy mode for when you are expecting.
CALM, OPT-IN REMINDERS
- Period soon, period late, fertile window, ovulation, pill and log reminders.
- Each one is independent and gentle, never spam.
EVERY FEATURE IS FREE
- Tracking, predictions, insights, PDF export, app lock and backup: all free.
- No subscription and no paywall.
- Supported by tasteful ads on secondary screens only. Your daily screen and your logging screen stay completely ad-free.
- Prefer a quiet day? Watch one short ad and the ads pause for 24 hours.
If you have been looking for a private period tracker without an account, an offline period calendar, or simply a menstrual calendar that does not want your email address, Petal was built for you. Understand your body's rhythm, on your terms, on your phone.
Note: Petal is a self-tracking and educational tool. Predictions and fertile-window estimates are not a reliable form of contraception and are not medical advice. Please talk to a clinician about any health concerns.