Life & fun · December 16, 2020
Period-Calculator.com
Privacy-first period calendar with smart predictions 📅
Period-Calculator.com launched on December 16, 2020 with 63 votes, #809 of 3,242 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 5 years on.
What it does
Period-Calculator.com lets you track your period and makes smart predictions about the future weeks. The female cycle isn't always 28 days long and this app takes this into account. All data stay on your device, no tracking, no ads. Free to use 🦸♀️
Privacy-first period calendar with smart predictions
Does a similar job
all alternatives →- IMI 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 · ▲89Easy to use period tracking app that respects your privacy
Simpluna2021 · simpluna.app · ▲68I'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…
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