Your cycle, finally understood. Private by design, offline by default.

I built Petal Chan as a private period and cycle tracker for iPhone and Android. Core tracking works without an account or a Petal Chan health-data server.

I store your health and cycle records locally inside the app on your device. I do not upload or sync them to a Petal Chan health-data server. How privacy works →

Yes. I keep core cycle tracking, moods, notes, energy, multiple tracking modes, visualizers, PIN protection, imports, full CSV export, all six languages, and ordinary notifications free. Chan+ adds deeper logging and a few extra privacy conveniences. Compare Free and Chan+ →

No. I made Chan+ a one-time purchase, not a recurring subscription. Every new customer gets a 15-day trial. Your App Store or Google Play listing shows the current local price. See what Chan+ adds →

Petal Chan calculates estimates locally from the cycle history you record. BBT, LH test, and cervical-fluid logs can add context, but I do not present them as certain ovulation or fertility predictions. How predictions work →

No. I did not build Petal Chan as a medical device. It does not provide medical advice and should not be used as contraception or to determine safe days. Read the medical-use limits →

I'm Ayush Mishra. I created and develop Petal Chan. The original idea came from Sly, who wanted a cycle tracker where the person using it stayed in control of their information. About Petal Chan →