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YourCycleKeeper – a client-side privacy-first period tracker

YourCycleKeeper – a client-side privacy-first period tracker

by pythonime·Mar 8, 2026·1 point·0 comments
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AI Analysis

●●SolidCozySolve My ProblemNiche Gem

AES-256 local storage + no servers beats Flo/Clue's data monetization, but the category exists.

Strengths
  • •Zero-friction privacy model (no account, no login, PIN-only encryption) matches stated threat model perfectly
  • •Cycle math is sound: ovulation prediction, symptom correlation, fertile-window calculation are standard but correctly implemented
  • •PWA + offline + encrypted backup export show thoughtful design for actual privacy-first use
Weaknesses
  • •Period tracking is solved category (Flo, Clue, Kindara have more features and larger communities)
  • •No evidence of clinical validation or study on prediction accuracy; comparison table claims superiority without numbers
Category
Health
Target Audience

People seeking period tracking without surveillance, privacy-conscious women

Similar To

Flo · Clue · Kindara

Post Description

Hi HN,

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.

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