From the rest of Mozilla Foundation:
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We tested six popular period and ovulation tracker apps to find out how they handle your private health data. Our privacy expert Shoshana Wodinsky did hands-on testing of 6 popular period tracking apps: Euki, Clue, Flo, Period Calendar, Planned Parenthood’s Spot On, and Stardust. Our testing found one app that stood out from the rest.
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Looking for an app outside U.S. jurisdiction? Discover how Germany's Clue app handles data encryption and ad tracking in our full privacy review. Our hands on testing found a company that's made thoughtful choices about user data and privacy. But the data you give it is still data: detailed, personal, and held by one company for as long as you keep using it. Find out why we gave the app a score of 8 out of 10.
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Read our hands-on testing results of the Period Calendar app. Find out if your cycle history and sensitive symptoms are being shared with third-party advertisers and why we gave the app a score of 6 out of 10.
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Is Euki the most private period tracker available? Read our deep-dive review to see how its 100% local data storage keeps your cycle history completely off the grid. The app impressed us so much that we gave it our first 10 out of 10 rating.
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Is the Spot On period tracking app safe? Read our deep-dive privacy review to see how the Planned Parenthood app handles your data, encryption, and third-party sharing. We gave the app a score of 5 out of 10. Our testing found that you should stick to the core logging features, keep the web out of the experience when you can, and use an anti-tracking browser when you can’t.
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Is Flo safe to use after its data sharing scandals? Read our privacy review to see how the world's most popular period tracker handles your sensitive health data and why we gave it a score of 7 out of 10. In our testing, we found a company that did the work to keep its reproductive-health modeling contained. In this category, that’s not something you should take for granted.
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Love the period app Stardust's daily horoscopes and moon-witch vibes, but worried about data security? Read our privacy review before logging your next cycle phase and find out why we gave the app a score of 2 out of 10. Our testing showed the app Stardust sends data to third-party services, including partners for analytics, tracking, and data routing. Not all of that data is innocuous; in some cases, the data being shared can include things like your birth control method, like whether you use medication or an IUD, your reproductive goals, like whether or not you’re trying to conceive.
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Read our privacy expert's review of the Ultrahuman Ring AIR. Our reviewer likes that it can work offline without any subscription fees, a feature that has garnered a significant amount of goodwill from its users. However, you're still locked into Ultrahuman's online-only ecosystem.
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Read our privacy expert's review of the Oura Ring Gen 4. While Oura says the right things about data protection in their privacy policy, there's no getting away from the fact that the product doesn't work without cloud connection, meaning that your most intimate health data lives on servers you do not control.
