Bluma

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.

• 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.

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  LadyLog - A period tracker2024 · ▲89

  Easy to use period tracking app that respects your privacy

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  heraNov 2025 · ▲187

  track your period safely

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  Lotus2017 · ▲92

  A calendar to help women’s track their menstrual cycle

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  Mooneva CycleMar 2026 · ▲2

  The period tracker that never sees your data - offline, free

• IB
  I built a privacy-first period tracker but it seems nobody cares2025 · ▲10

  There’s something quietly unsettling about how normal it's become to hand over our most personal data to apps that barely deserve our trust. My wife once showed me a notification she got from her period tracking app. At first, it seemed like a simple reminder. But then came the ads. Not long after, she started getting eerily specific suggestions on other platforms. Things she hadn’t searched for. Things that felt too close. Somewhere, her cycle had been turned into a data point. That bothered me more than I can explain. These apps promise helpful insights. But in return, they take so much.…

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• NW
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  Life & fun · May 2026 · github.com

• FM
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