Developer builds offline, open-source period tracker to keep health data off the cloud

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A developer has released Mooneva Cycle, a free and open-source period and cycle tracking app built with React 19, TypeScript, and Capacitor 8, designed to run entirely without cloud servers or user accounts. All health data is stored locally on the user's device using localStorage or Capacitor's Secure Storage, eliminating the risk of remote data breaches or corporate data sales. The app uses standard Web Crypto APIs — specifically PBKDF2 key derivation and AES-GCM 256-bit encryption — to secure offline backups without any third-party cryptographic libraries. Additional privacy features include a disguise mode that masks the app's icon, biometric and PIN lock support, and on-device notifications that bypass cloud messaging services entirely. Released under the GPL-3.0 license, Mooneva Cycle supports web, iOS, and Android, offers 12 languages with RTL layout, and includes Persian Jalaali calendar support alongside the Gregorian calendar.

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