Ebb — Private Cycle Tracking | Zero-Knowledge Architecture
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End-to-End Encrypted
Zero-Knowledge
Your Cycle.
Your Data.
No Compromises.
The only period tracker that uses homomorphic encryption —your data is encrypted<br>before it leaves your device, and stays encrypted everywhere. We can't read it.<br>No one can. Not even us.
"After Roe v. Wade was overturned, period tracking data became a legal liability.<br>Ebb was built so your most intimate data can never be subpoenaed, sold, or leaked."
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See How It Works
Menstrual
Follicular
Ovulation
Luteal
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Privacy by Design
Every architectural decision prioritizes your bodily autonomy.<br>Built with the same cryptography used by Signal and Proton.
Client-Side Encryption
Your data is encrypted on your device using AES-256-GCM before any network transmission.<br>The encryption keys never leave your device—not even for backups.
Zero-Knowledge
Homomorphic Encryption
Compute on encrypted data. We can generate aggregate statistics for research<br>without ever decrypting your individual information. Mathematical magic.
Advanced Cryptography
Partner Sync
Share cycle information with partners using secure multi-party computation (MPC).<br>They learn fertility windows without seeing raw data. Consent-based sharing.
Secure MPC
No Database
Nothing to hack. Your encrypted data lives only in your browser's IndexedDB.<br>No central server means no central point of failure. Ever.
Serverless
Zero Telemetry
No analytics, no cookies, no fingerprinting. We don't know who you are,<br>where you are, or how you use the app. And we architecturally cannot know.
No Tracking
Ephemeral by Default
Data auto-deletes after your chosen retention period. No logs, no history,<br>no way to reconstruct your past cycles. True digital forgetting.
Auto-Delete
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Why Ebb is Different
Feature<br>Ebb<br>Other Apps
Data Storage
Your Device Only
Cloud Servers
Encryption
Client-side AES-256
Server-side (they hold keys)
Account Required
No
Email/Phone Mandatory
Data Sales
Impossible (we have no data)
Common Revenue Model
Legal Subpoena Risk
None (no server data)
High Risk Post-Roe
Open Source
Yes (verifiable)
Proprietary Black Boxes
Cryptographic Architecture
Ebb implements a zero-trust architecture where your device is the only trusted party.<br>We use battle-tested cryptographic primitives combined with cutting-edge privacy-preserving computation.
Web Crypto API: Native browser encryption with hardware acceleration.
TFHE Scheme: Fully homomorphic encryption for private analytics.
MPC Protocols: Secure multi-party computation for partner sharing.
Zero-Knowledge Proofs: Verify predictions without revealing data.
Read the Technical Whitepaper
256-bit AES-GCM
Encrypted at Rest & In Transit
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Reclaim Your Bodily Data
In a post-Roe America, your period tracking data is a liability.<br>Ebb ensures your most intimate information can never be weaponized against you.
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Free forever. No data collection. Open source.<br>Version 2.1.0
SOC 2 Type II Ready
GDPR Compliant
HIPAA Aligned
Audited by Cure53