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Dev tools · May 8, 2026

Bluma

Private period tracker that works offline

Bluma launched on May 8, 2026 with 2 votes, #6,288 of 20,538 launches that month.

What it does

Most period apps send your health data to a server. Bluma doesn't. Track your periods, ovulation, symptoms, and moods without worrying about where your health data ends up. Get predictions, spot patterns, and better understand your menstrual cycle. Everything stays on your device, offline and encrypted. No account. No ads. No leaks. Open source and available on Android, with iOS support coming soon.

Bluma is a private period tracker that stores your data on your device. Track periods, ovulation & symptoms offline. No account needed. No ads. Open source.

Log your periods and get predictions for future ones, ovulation, and fertile window, with optional reminders before each one arrives. Track symptoms, moods and other health markers to identify patterns over time, and notice when something's off. Everything you log is encrypted and stored on your device. No cloud, nothing to sell, share, or leak. Lock the app with biometrics, and inspect the code on GitHub . Create encrypted backups anytime and restore them if you change your phone. Bluma is built to be as easy and enjoyable to use as it is private. No ads, no upsells, nothing to interrupt you. I was concerned about how health data is handled by many period tracking apps. I tried…from bluma.health

Does a similar job

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  • IM
    I made a privacy friendly and simple app to track my menstruation2024 · play.google.com · ▲732

    Hey HN, after the app I actually used to track my period wanted me to log in and save my data in the cloud, I decided to write my own. Most apps in this area are based on a subscription model and display far too much information anyway. For me, a simple calendar is enough where I can add a few notes if necessary. So that is the result of my work - a simple design and the data is only saved on the smartphone.

  • LadyLog - A period tracker2024 · play.google.com · ▲89

    Easy to use period tracking app that respects your privacy

  • Faye - Free Privacy-first Period Tracker2025 · faye.health · ▲20

    Track your menstrual cycle with accuracy and total privacy

  • heraNov 2025 · apps.apple.com · ▲187

    track your period safely

  • Simpluna2021 · simpluna.app · ▲68

    I've been running Simpluna, a period-tracking app, for six years. It's a company based in Tokyo, Japan, but development and operations are basically a one-person effort. The app is built with React Native (Expo). The defining trait of the app is that it's simple, with no unnecessary features. Recording periods, calculating predictions, and sending notifications — that's the core of it. This space is dominated by big players (Flo, Clue, and in Japan, Luna Luna). Building something similar would have been hopeless, so I made the things those apps don't have my selling point. Optional features…

  • Luna - Private Period TrackerNov 2025 · apps.apple.com · ▲11

    Your period data never leaves your phone. 100% private.

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