Petal
Your cycle is your business.
A period and cycle tracker that never sends your data anywhere. No account, no cloud: everything stays on your phone or in your browser. Predictions, symptom insights and a report for your doctor, completely free.
What it does
Predictions that learn
Next period, fertile window and ovulation estimate from your own last six cycles, with an honest irregularity warning.
Patterns you can see
Flow, symptoms, mood and temperature in a couple of taps, and when symptoms usually appear.
Ready for the doctor
A one-page summary you can print or save as a PDF, plus a spreadsheet export.
Private by construction
The Android app has no internet permission at all; the web app's security policy blocks every connection.
Made for
Anyone who tracks their cycle and wants that data to stay theirs.
Pricing
Free. No ads, no tracking.
Built on NexusLayer
Petal is designed, built and operated by NexusLayer. Here is what it runs on.
- On-device onlyNo server storage at all. Data never leaves the phone or browser.
- NexusLayer CloudContainerised services on NexusLayer servers in Germany, behind TLS, with nightly backups.