Open source alternatives to Auth0

3 projects on starwire do the same job. Ranked by how much of what Auth0 does each one covers, read from its README and website. Ties go to the most active.

What Auth0 does

Login and sign-up for appscore
OAuth, OIDC and SAMLcore
Social logins
Multi-factor authentication
User management
Organizations for B2B
Rules and hooks

Each dot in the table is one job, in this order. Square dots are core jobs and count double. Full means yes, half means partly. "See the evidence" under a project shows the line behind each one. Coverage is what a project documents, not how well it works or how hard it is to move to. How we score this

Project	Covers	Stars	Commits, 12 weeks	Last release	Closed vs opened	Setup	License
tesseralOpen source authentication and user management service for B2B SaaS	Replaces it94%	1.1k+1	0	16 months ago	Too few	Hosted version	MIT
Covers all 2 core jobs. Partly: Rules and hooks.See the evidence Login and sign-up for appscoreYesHosted, customizable login pages OAuth, OIDC and SAMLcoreYesSAML (Enterprise Single Sign-On) Social loginsYesAdd Log in with Google, Log in with GitHub Multi-factor authenticationYesMulti-factor authentication (MFA) User managementYescan add or remove users at will Organizations for B2BYesB2B multitenancy Rules and hooksPartlyLive-sync data from Tesseral into your database
authentikSelf-hosted identity provider supporting SAML and OAuth2	Replaces it89%	26k+83	1,336	24 days ago	100%	Needs a server	Custom license
Covers all 2 core jobs. Partly: Social logins; Organizations for B2B.See the evidence Login and sign-up for appscoreYesAuthentication Enrollment Self-service OAuth, OIDC and SAMLcoreYessupports SAML, OAuth2/OIDC, LDAP, RADIUS, and more Social loginsPartlyFederation support Multi-factor authenticationYesWebAuthn (Passkeys) User managementYesrobust, large-scale identity management Organizations for B2BPartlyCovers both B2B and B2C use cases. Rules and hooksYesfully customizable policies to automate any workflow
keycloakOpen source identity and access management server with OIDC and SAML	Replaces it83%	38k+117	943	9 days ago	86%	Needs a server	Apache-2.0
Covers all 2 core jobs. Partly: Rules and hooks. Not shown: Organizations for B2B.See the evidence Login and sign-up for appscoreYesAdd authentication to applications and secure services OAuth, OIDC and SAMLcoreYesOpenID Connect, OAuth 2.0 and SAML 2.0 Social loginsYesEasily enable social login Multi-factor authenticationYessetup two-factor authentication User managementYesThey can also manage users, including permissions and sessions Organizations for B2BNot shownNeither the README nor the website mentions it. Rules and hooksPartlyExtensible Customize through code

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