Your Cycle.

End-to-End Encrypted Zero-Knowledge

Your Cycle.

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."

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Menstrual

Follicular

Ovulation

Luteal

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Privacy by Design

Every architectural decision prioritizes your bodily autonomy. 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. 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 without ever decrypting your individual information. Mathematical magic.

Advanced Cryptography

Partner Sync

Share cycle information with partners using secure multi-party computation (MPC). 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. 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, 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, no way to reconstruct your past cycles. True digital forgetting.

Auto-Delete

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Why Ebb is Different

| Feature | Ebb | 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. 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.

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. Ebb ensures your most intimate information can never be weaponized against you.

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Free forever. No data collection. Open source. Version 2.1.0

SOC 2 Type II Ready

GDPR Compliant

HIPAA Aligned

Audited by Cure53