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Best Multi-User Identity & SSO for self-hosting

The 18 best Multi-User identity & sso you can self-host, ranked by community traction.

SuperTokens

Open-source user authentication you can self-host

Replaces Auth0, Firebase Auth

★ 15.3k Medium setup Apache-2.0

Logto

Developer-friendly authentication and authorization platform

Replaces Auth0, Firebase Auth

★ 14.7k Medium setup MPL-2.0

Casdoor

UI-first identity and access management with SSO support

Replaces Auth0, Okta

★ 14.6k Medium setup Apache-2.0

Ory Kratos

Headless identity and user management API server

Replaces Auth0, Firebase Auth

★ 13.9k Hard setup Apache-2.0

LLDAP

Lightweight LDAP server with a simple web interface

Replaces Active Directory, OpenLDAP

★ 6.6k Easy setup GPL-3.0

FreeRADIUS

High-performance open-source RADIUS server

Replaces Cisco ISE

★ 2.6k Hard setup GPL-2.0

Authgear

Open-source authentication and user management server

Replaces Auth0, Firebase Auth

★ 2.1k Hard setup Apache-2.0

privacyIDEA

Self-hosted two-factor authentication management

Replaces Duo Security, RSA SecurID

★ 1.8k Medium setup AGPL-3.0

FreeIPA

Integrated identity management for Linux and Unix environments

Replaces Active Directory

★ 1.3k Hard setup GPL-3.0

Samba Active Directory DC

Open-source Active Directory compatible domain controller

Replaces Active Directory, Windows Server

★ 1k Hard setup GPL-3.0

Janssen Project

Cloud-native identity and access management platform

Replaces Okta, Auth0

★ 652 Hard setup Apache-2.0

midPoint

Open-source identity governance and administration platform

Replaces SailPoint, Saviynt

★ 537 Hard setup Apache-2.0

LDAP Account Manager

Web frontend for managing entries in an LDAP directory

Replaces Active Directory Users and Computers

★ 491 Medium setup GPL-3.0

OpenLDAP

The classic open-source Lightweight Directory Access Protocol server

Replaces Active Directory

★ 400 Hard setup OLDAP-2.8

Apache Syncope

Open-source system for managing digital identities

Replaces SailPoint, Okta

★ 343 Hard setup Apache-2.0

Univention Corporate Server

Integrated identity and infrastructure management platform

Replaces Microsoft Active Directory

★ 309 Hard setup AGPL-3.0

Shibboleth Identity Provider

Standards-based SAML identity provider for federations

Replaces Okta, Ping Identity

★ 200 Hard setup Apache-2.0

Hello Identity Coop

Open-source authentication broker for passwordless login

Replaces Auth0, Firebase Auth

★ 7 Medium setup MIT

At a glance

App	Deploy effort	Difficulty	Min. RAM	License	★ Stars
SuperTokens	Under-an-hour setup	Medium	512 MB	Apache-2.0	15,348
Logto	Under-an-hour setup	Medium	512 MB	MPL-2.0	14,676
Casdoor	Under-an-hour setup	Medium	256 MB	Apache-2.0	14,562
Ory Kratos	Under-an-hour setup	Hard	256 MB	Apache-2.0	13,921
LLDAP	Under-an-hour setup	Easy	64 MB	GPL-3.0	6,564
FreeRADIUS	Under-an-hour setup	Hard	256 MB	GPL-2.0	2,614
Authgear	Under-an-hour setup	Hard	1,024 MB	Apache-2.0	2,106
privacyIDEA	Under-an-hour setup	Medium	512 MB	AGPL-3.0	1,781
FreeIPA	Read-the-docs project	Hard	2,048 MB	GPL-3.0	1,295
Samba Active Directory DC	Under-an-hour setup	Hard	512 MB	GPL-3.0	1,000

Quick picks

Most adopted: SuperTokens (15,348 GitHub stars).
Lightest footprint: LLDAP (from 64 MB RAM, against 4,096 MB for the heaviest here).
Fastest to deploy: Univention Corporate Server (one-click platform packages).
Licensing: 8 of 18 use Apache-2.0; check the rest individually if you plan to modify and redistribute.

Every option here is open-source and self-hostable, tagged Multi-User within the identity & sso category. Deploy effort is graded from published container recipes, not vendor claims — see the methodology.

Keep exploring

All Identity & SSO Easiest Identity & SSO to self-host How to choose identity provider: the Identity & SSO buyer's guide

Head-to-head: Multi-User identity & sso