Does Natural Cycles protect my data better than Flo?

Natural Cycles has no documented history of selling or misusing user data, which distinguishes it from Flo. As a regulated medical device, it operates under FDA oversight that creates accountability beyond a typical app. However, it still stores your data on its servers, which means it can be compelled to produce that data via court order.

Is Natural Cycles worth $12.99/mo compared to cheaper trackers?

If you are using it as a contraceptive method and relying on the fertility clearance, the price may be justified by the FDA accountability and the temperature-based precision. If you are using it primarily for cycle tracking and not as contraception, the price is hard to justify against on-device alternatives at $5.99/mo or free.

Can Natural Cycles be subpoenaed?

Yes. Natural Cycles stores user data on its servers. A valid court order can compel Natural Cycles to produce that data. The company's privacy policy and regulatory compliance limit what it can do commercially with your data, but they do not prevent legal compulsion.

Is Natural Cycles safe to use?

Natural Cycles is FDA-cleared for contraception and has strong clinical backing. From a data privacy standpoint, it is cloud-based and requires extensive personal health data. If your primary concern is fertility tracking accuracy, Natural Cycles is a solid option. If your primary concern is data privacy, on-device apps are safer.

Does Natural Cycles sell user data?

Natural Cycles has not been subject to FTC enforcement. However, as a cloud-based app with significant health data, it is subject to legal process. The December 2024 class action alleges hidden trackers capturing reproductive data in real time. FDA-cleared medical devices also have specific data requirements that may require retention even if a user wants to delete their data.

alternatives

Natural Cycles Alternative: No Server-Side Data

Natural Cycles has FDA clearance and no documented data scandals, but stores your data server-side. These alternatives keep everything on your device.

Natural Cycles Occupies a Specific Niche Natural Cycles is not a typical period tracker. It received FDA De Novo clearance in 2018 as a contraceptive method, the first app to receive this designation. The FDA review covered the efficacy of the basal body temperature method for preventing pregnancy, not the privacy architecture of the app. For users who want a scientifically validated fertility awareness method, Natural Cycles has a meaningful distinction from calendar based trackers. For users who primarily want to track their cycle and avoid a cloud component, the FDA clearance is not the relevant consideration. Where Natural Cycles Stands on Privacy Natural Cycles had no documented enforcement actions or known data selling history prior to December 2024. The company is headquartered in Sweden, which means it operates under GDPR. These were cited as genuine advantages compared to Flo's track record. That changed on December 4, 2024, when a class action was filed: S.A., et al. v. NaturalCycles USA Corp., Case No. 3:25 cv 10421 WHO, N.D. Cal. The lawsuit alleges Natural Cycles embedded hidden tracking technologies from Mixpanel, AddShoppers, Google, and TikTok that captured reproduc