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Best Period Trackers After the Flo Privacy Scandal (2026)

We ranked 5 period trackers for users leaving Flo after the FTC settlement. Criteria: storage model, SDK presence, data-sharing risk.

How We Evaluated We tested each app on three things: where your data is physically stored, what third party code is embedded in the app, and whether an account or email is required to use it. These are the structural privacy questions that matter more than any privacy policy language. A policy can change. Architecture cannot be changed without rebuilding the app. We did not evaluate prediction accuracy as a primary factor because all five apps produce reasonable cycle predictions after 3+ recorded cycles. The privacy architecture is what separates them. The Privacy Architecture Spectrum Period trackers fall into two categories. On device trackers store everything on your phone and have no server component. Server based trackers upload your data to company infrastructure. The difference matters because data on a server can be accessed by the company, shared with partners, subpoenaed by law enforcement, or exposed in a breach. Data on your device can only be accessed by someone with physical access to your unlocked phone. Floriva, Drip, and Euki are on device. Clue and Glow are server based. This is the most important distinction in the comparison. Why Server Based Trackers Keep Usin