I built a small open-source project called YourCycleKeeper, a privacy-first period tracker that runs entirely client-side.

The motivation was simple: I noticed that many period tracking apps request extensive permissions and integrate multiple third-party trackers.

I wanted an alternative where:

- no accounts are required

- no data leaves the device

- no analytics or tracking scripts are included

- everything runs locally in the browser

So this app works entirely client-side and stores data locally.

The project is still in beta but usable, and I’m planning an Android APK version soon.

Demo: https://yourcyclekeeper.web.app/period-tracker/

Intro: https://yourcyclekeeper.web.app/

Source: https://github.com/pythonime-lab/yourcyclekeeper

I’d really appreciate feedback from the HN community, especially around the architecture and privacy model.