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Privacy-First Flutter Apps: On-Device Data

by Muhammad Uzair dev.to

7 min read

HerCycle, a privacy-first period tracker I built, stores everything on the device: cycle logs, symptom history, and health reports. There is no account, no registration, and no server sync. The app works fully offline, and it ships with a PIN and biometric app lock. For an app that holds some of the most sensitive health data a person has, that architecture is not a marketing line. It is the prod…

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