Inner Flare

A private period and cycle tracker. Data is encrypted on your phone and locked behind your fingerprint, face or passcode.

Works on: Android
Setup: Easy: Install from an app store.
Your data: Stays on your device
Account needed: No
Works offline: Yes
Export: Backup file
License: GPL-3.0-or-later
Last reviewed: 2026-10-07

No network access at all. Predictions show what they're based on. The export is a backup for moving to another phone, not a report to share. iPhone version is in App Store review.

Home screen with a button to log today, plus shortcuts to the calendar and cycle insights — Source · GPL-3.0-or-later

Logging a day with flow set to medium, cramps and fatigue selected, and a short note — Source · GPL-3.0-or-later

Insights showing average cycle length, how much cycles vary, and estimated next period and fertile window — Source · GPL-3.0-or-later

Screenshots from the Inner Flare project, under their own license as shown. Not covered by this index's CC0.

Inner Flare

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