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Go back to the report page Methodology We looked at the top period tracking apps downloaded in the Google Play Store, some of which we had examined in our original research, and some of which are newly emerging apps that have since grown in popularity. The top period-tracking apps with the most downloads included Flo; Period Tracker by Simple Design; and apps we'd tested in our previous research that still exist such as Maya, Period Tracker by GP Apps, as well as several apps popular…
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Go back to the full report page Flo, headquartered in London, UK, is one of the most popular period-tracking apps on the market with over 380 million downloads. The app was previously accused of sharing data with Facebook, such as informing Facebook whenever a Flo user was on their period or if they intended to get pregnant. In 2021, the U.S. Federal Trade Commission (FTC) reached a settlement with Flo to undergo an audit of their privacy policy and to obtain user permissions before…
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Go back to the full report pagePeriod Tracker by Simple Design is another popular period tracking app that has over 150 million users. To begin using this app the user answers a set of three onboarding questions for about their cycle pattern. The user has the option to answer 'I'm not sure' for each question. After answering 'I'm not sure' for these three questions, we were able to proceed on the app without having to create an account. Throughout our experience inputting our cycle…
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Go back to the full report pageThe Maya app is a period tracker app by Plackal Tech based in India. In our previous investigation, we revealed Maya was sharing a plethora of user input data to Facebook. However, in response to our 2019 research, the app claimed it had since ‘removed both the Facebook core SDK and Analytics SDK from Maya’ while ‘continu[ing] to use the Facebook Ad SDK, post opt-in to our terms and conditions and privacy policy’ for revenue purposes, the latter of which 'does not…
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Go back to the full report pagePeriod Tracker by GP Apps is another popularly downloaded app we previously looked at in 2019. In our original research, we determined that this app did not appear to share any user input data with Facebook. This time, we examined the third parties that the app appeared to integrate and what kind of data was being shared with these third parties, as well as what user data the app was storing on its own or external services. It’s worth noting that the…
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Go back to the full report pageThe WomanLog app, developed by Pro Active App SIA, is a Latvia-based period tracking app with over 10 million downloads that features an 'Intelligent Assistant' chatbot (more on this below). To get started on the app, we completed a short onboarding questionnaire about which app mode we intended to use (e.g., standard) and the length of our cycle and period. Our answers to these questions were sent across the web traffic to the app developer's API:
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Go back to the full report pageWocute is a Singapore-based period tracking app with over 5 million global downloads. To get started on the app, a user first needs to complete a short onboarding questionnaire about their goal for using the app ('track my cycle'); their year of birth (which we skipped), followed by the length of their period cycle and start date of their last period (for which we selected 'I'm not sure'). These responses were all communicated to the API:
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Go back to the full report pageStardust is a New York-based astrology-themed period tracking app that has recently risen in popularity, having received a spike in downloads in the U.S. following the overturning of Roe v. Wade. According to its website, the app takes a de-identification approach to users' privacy by utilising a third party 'security system' operated by Rownd, “an authentification platform that stores your contact information for us [Stardust] so that we cannot associate your…
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Go back to the full report pageThe last app we looked at was Euki, which has been recognised among privacy advocates. The app is a U.S. non-profit privacy-by-default period tracker app founded by a group of social tech and sexual and reproductive health organisations like Digital Defense Fund and Ibis Reproductive Health. The app has recently become open-source. We ran the Euki app through the DIAAS environment to observe its web traffic as for the above apps. There were no onboarding…
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Go back to the full report pageLimitationsBefore our analysis, we note the technical limitations (and the scope of our research) meant we did not test certain features mentioned, such as Google Fit integrations offered by some apps. We also mention the limitations of our DIAS environment, which only allows us to see web (client-side) interactions, rather than server-side interactions, the latter of which are increasingly common among more advanced platforms that utilise cloud computing (e.…
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Our research has introduced questions about the right to privacy when apps have the potential to share a range of user-related data. This is a particular concern for people using apps in countries where there are restrictions on access to abortion. In the US, after the overturning of Roe v Wade, concerns around the privacy practices of period-tracking apps have been raised in states that have introduced restrictions and bans on access to abortion. It could be very possible for some period…
