What "stored on your device" means
Local-only cycle tracking means your period notes are saved on the phone or browser you are using, not in an account you have to trust.
Read the guidePrivacy notes
Period tracking privacy, in normal words
These short posts explain why open-cycle is a privacy-first period tracking app, what local phone-only storage means, and what real health app privacy cases can teach everyday people.
Why health app privacy keeps coming up
Real FTC cases show how sensitive health data can move in ways people did not expect.
See the examplesQuestions to ask before using a cycle app
A quick checklist for choosing a privacy-first period tracker without needing to read a privacy policy like a lawyer.
Use the checklistA period tracker without an account
Basic cycle logging should not require an email address, password, or another company account.
Read the no-account guideWhy internet access matters
A local phone-only period tracker is easier to understand because the default path for your notes is smaller.
Read the phone-only guide