Client-Side Encryption
Your data is encrypted on your device using AES-256-GCM before any network transmission. The encryption keys never leave your device—not even for backups.
Zero-Knowledge
End-to-End Encrypted Zero-Knowledge
Your Cycle.
Your Data.
No Compromises.
The only period tracker that uses homomorphic encryption—your data is encrypted before it leaves your device, and stays encrypted everywhere. We can't read it. No one can. Not even us.
"After Roe v. Wade was overturned, period tracking data became a legal liability. Ebb was built so your most intimate data can never be subpoenaed, sold, or leaked."
Privacy by Design
Every architectural decision prioritizes your bodily autonomy. Built with the same cryptography used by Signal and Proton.
Homomorphic Encryption
Compute on encrypted data. We can generate aggregate statistics for research without ever decrypting your individual information. Mathematical magic.
Partner Sync
Share cycle information with partners using secure multi-party computation (MPC). They learn fertility windows without seeing raw data. Consent-based sharing.
No Database
Nothing to hack. Your encrypted data lives only in your browser's IndexedDB. No central server means no central point of failure. Ever.
Zero Telemetry
No analytics, no cookies, no fingerprinting. We don't know who you are, where you are, or how you use the app. And we architecturally cannot know.
Ephemeral by Default
Data auto-deletes after your chosen retention period. No logs, no history, no way to reconstruct your past cycles. True digital forgetting.
Why Ebb is Different
Reclaim Your Bodily Data
In a post-Roe America, your period tracking data is a liability. Ebb ensures your most intimate information can never be weaponized against you.
Free forever. No data collection. Open source. Version 2.1.0