Privacy-First Identity
Sign In
Without Surveillance.
Sign in with your device. Sync across your devices. No passwords. Built to reduce cross-site tracking.
Sites on the Lemma network receive a site-specific pseudonym for you, which helps reduce cross-site linkability when sites avoid sharing extra identifiers. You control your wallet identity data.
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How It Works
Your identity lives in lemma.id, syncs across devices, and can share minimal claims per site based on integration policy.
Create Once
Set up lemma.id with a passkey. No password needed - your device is the key.
Sync Everywhere
Link any device. lemma.id syncs automatically - phone, laptop, tablet.
Sign In Anywhere
One tap on any network site. Each sees a unique pseudonym - unlinkable.
Privacy-Preserving Login
Each site sees a unique identifier for you (PPID). This design helps limit cross-site linkability when sites avoid sharing additional identifiers.
Cross-Device Sync
lemma.id data is encrypted end-to-end and synced across all your devices. Lost your phone? Sign in on any linked device.
Passkey Security
Biometric or device-based authentication. No passwords to remember, phish, or breach. Hardware-backed security.
Network Effect
One wallet identity can sign you in across participating Lemma sites. As adoption grows, more sites can support that same identity.
Permission Control
Grant and revoke access per site. See exactly what each site can access. You're in control, not them.
Local-First Verification
Return-visit credentials can be verified locally in your browser using Ed25519 signatures, while backend verification/session binding remains available for server-enforced flows.
Join the Beta
Free access to privacy-first authentication. No credit card required.
Passwordless • Privacy-first • Cross-device sync