Private by default
Zero health data is ever transmitted to our servers. Your database is encrypted locally with hardware-backed keys.
Our philosophy
Cycle tracking should be empowering,
never invasive.
Reproductive health is deeply personal. Yet modern tracking apps frequently demand account registrations, upload intimate logs to remote cloud servers, and embed tracking SDKs that monetize sensitive physical signals.
Moonthly is engineered differently. We built an offline-first architecture where every calculation runs on your smartphone processor, and your records are encrypted with SQLCipher. No accounts, no surveillance, no corporate compromises.
100%Health data stored on-device
0Third-party tracking SDKs
0User accounts or passwords required
AES-256SQLCipher database encryption
Core values
The principles we uphold
Simple & intuitive
Logging your daily cycle metrics takes seconds, with a high-contrast editorial aesthetic that brings clarity.
Honest & transparent
We are open about statistical limitations: cycle forecasts are mathematical estimates, never contraceptive advice.
Independent technology
Funded directly by transparent user subscriptions, never by selling user profiles or running targeted advertisements.
Important Medical Notice
Moonthly is an informational tracking tool, not a medical device or healthcare provider. Never use Moonthly as contraception or to prevent pregnancy. Read our full health disclaimer →
Moonthly is an informational tracking tool, not a medical device or healthcare provider. Never use Moonthly as contraception or to prevent pregnancy. Read our full health disclaimer →