What is Atlas?

Atlas is a complete authentication and user-management platform — the identity layer for your product. Instead of building sign-up, sign-in, sessions, multi-factor authentication, social logins, organizations and enterprise SSO yourself, you drop Atlas in and get all of it, production-ready, in an afternoon.

Atlas is in the same class as Clerk and Auth0, with one important difference: it is fully self-hostable. Run it on our cloud at atlasauth.net, or deploy the exact same platform inside your own infrastructure. Same features, same SDKs, your data.

What you get

• 56 sign-in connections — Google, GitHub, Microsoft, Apple, Slack, Discord, GitLab, LinkedIn, Facebook, Twitch, X, Spotify, Steam and many more — plus passwords, one-time codes, magic links, passkeys and Sign in with Ethereum.

• Drop-in UI — hosted pages and embeddable components that render a complete, themeable sign-in and sign-up flow. No design work required.

• Sessions & JWTs — short-lived, signed session tokens with refresh and reuse detection. Verify them anywhere against a public JWKS.

• Organizations & teams — multi-tenant B2B from your first commit: members, invitations, roles and fine-grained permissions, isolated per tenant.

• Multi-factor authentication — TOTP authenticator apps, passkey second factors and one-time backup codes.

• Enterprise SSO — SAML and OIDC connections, enforced SSO per email domain, and SCIM user provisioning.

• Customization — your brand's colors, logo and copy on every screen, custom email and SMS templates, and your own domain.

• Security by construction — encryption at rest, strict tenant isolation, rotating tokens, rate limiting and a full audit trail on every instance.

How it fits together

Your frontend talks to Atlas with a publishable key to run the sign-in experience. Your backend talks to Atlas with a secret key, and verifies the session tokens your users carry. Atlas sits in the middle holding users, sessions, organizations and connections.

Who Atlas is for

• Startups shipping their first product who want auth done right on day one — free up to 10,000 monthly active users.

• B2B / SaaS teams that need organizations, roles and, eventually, enterprise SSO — without a re-platform.

• Teams with compliance or data-residency needs who want to self-host the whole identity layer.

Where to go next

1. Create your account & tour the dashboard — sign up and get oriented.

2. Create an application — set up your first app with dev and prod instances.

3. Publishable & secret keys — understand the two keys and where each belongs.

4. Add sign-in to your app — go live with a real sign-in flow.

New to auth terms? The Concepts section explains instances, users, sessions and the difference between authentication and authorization in plain language.