List of Period Tracker Apps with End-to-End Encryption

A list of period tracker mobile apps that offer end-to-end encryption so that even the cloud storage host cannot access your data.

• Apple Health – Cycle Tracking — End-to-end encrypted when synced through iCloud with two-factor authentication and a device passcode.
• HUSH: Period & Cycle Tracker — Claims on-device encryption with keys that never leave the device.
• PrivatePeriod Tracker — Local-only by default; optional connected features are advertised as end-to-end encrypted.
• Pink Moon Period Tracker — Advertises end-to-end encryption for cycle data.
• Opalia — Cycle data stays on-device; optional backups and partner sharing are end-to-end encrypted.
• PinkyBloom — Local-first tracking with end-to-end encrypted partner sharing.
• ReglFit — Advertises zero-knowledge, on-device encryption.
• Euki — Keeps cycle data on-device rather than transmitting it to a server.
• Drip — Open-source and keeps period data locally.
• Stardust privacy review — Mozilla reported in 2026 that Stardust removed its end-to-end-encryption claims.