Private period tracker app with no account required, works offline
Stage
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Founded
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Based in
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Pricing model
Freemium
Freemium
Pricing
Not given
Free for all core features (period logging, calendar, predictions, reminders, export, deletion). Cloud sync: US$3.99 one-time purchase for syncing across devices and transferring records to a new phone.
Key features
Record health events, observations, measurements and reports
Select and share only what's needed
No accounts or servers required
Plain text files in Org Mode format
Sync only if you decide to, using tools you trust
Period and cycle logging in one tap
Next-period prediction with date range and confidence level
Cycle calendar view
Export data as JSON, CSV, or readable summary
One-tap delete all with confirmation
Works fully offline with no internet required
Optional encrypted cloud sync across devices
Ovulation window and ovulation day estimates
No ads, analytics, or third-party data sharing
What makes it different
On-device by default with no analytics or profiteering from health data
Files you own in standard Org Mode format that you can inspect, back up or migrate
Cross-platform plain text storage fully under your control
No account required to use — open and start logging immediately
All data stays on your phone by default with no forced cloud sync
Handles irregular cycles by widening prediction range instead of marking you abnormal
Completely free core features with optional one-time paid sync, never a subscription
Privacy-first design with no third-party integrations or data selling
Harp
Mori