Compare tools side by side · TechInTrends

Self-hosted identity provider with flows, SSO (OIDC/SAML/LDAP) and an app proxy; homelab and enterprise favorite.

CNCF open-source identity and access management server with SSO, OIDC, SAML and user federation.

Hosted auth and user management with drop-in UI components, popular in the Next.js ecosystem.

Cloud-native, multi-tenant identity platform with OIDC, SAML, passkeys and an event-sourced core.

Head to head

Metric	authentik	Keycloak	Clerk	Zitadel
Stars	26.3k	37.7k	n/a	15.5k
Weekly downloads	n/a	n/a	3.6M	n/a
Download growth	n/a	n/a	+49%	n/a
Popularity score	81/100	84/100	80/100	77/100
Forks	2.1k	9.1k	n/a	1.4k
Open issues	911	3.4k	n/a	1.4k
Last commit	3d ago	1w ago	n/a	1w ago
Latest version	n/a	n/a	7.9.25	n/a
License	n/a	Apache-2.0	n/a	AGPL-3.0
First released	2019	2013	n/a	2020
Signals	Trending	Popular	None	Rising
Listed in	Security & Identity › Identity providers & SSO	Backend › Authentication Libraries Security & Identity › Identity providers & SSO	Backend › Authentication Libraries Security & Identity › Identity providers & SSO	Security & Identity › Identity providers & SSO

Weekly downloads over time

Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): authentik, Keycloak, Zitadel.