Petal
Your cycle, privately.
Your data stays on your phone — no cloud, no corporate greed.
When did your last period start?
We'll calculate your cycle day from here.
Tap the day it started
About your cycle
Just estimates — Petal learns as you log.
Cycle length
days from one period to the next
28
Period length
how many days it usually lasts
4
Export your data
All data lives on your device. Download a copy to keep it safe.