Best Free Auth Tools

A

Auth0 (B2B)

Free tier available

Flexible authentication and authorization platform for B2B applications, by Okta

Switching Cost: significant

A

Auth0 (B2C)

Free tier available

Flexible authentication and authorization platform for B2C applications, by Okta

Switching Cost: significant

C

Cerbos

Free tier available

Policy-as-code authorization engine with YAML policies, audit logs, and managed PDP deployment

Switching Cost: moderate

C

Clerk

Free tier available

Authentication and user management platform with prebuilt UI components, OAuth/OIDC support, and enterprise SSO

Switching Cost: significant

D

Descope

Free tier available

Drag-and-drop authentication and user management platform with visual workflow builder

Switching Cost: significant

F

Frontegg

Free tier available

B2B SaaS authentication and user management platform with multi-tenancy

Switching Cost: significant

F

FusionAuth

Free tier available

Full-featured auth platform with self-hosting option and MAU-based cloud pricing

Switching Cost: moderate

H

Hanko

Free tier available

Passkey-first authentication with generous free tier

Switching Cost: moderate

K

Kinde

Free tier available

Authentication and user management for modern apps with built-in feature flags

Switching Cost: significant

L

Logto

Free tier available

Open-source auth infrastructure with SSO, MFA, RBAC, organizations, and multi-tenancy

Switching Cost: moderate

O

Ory

Free tier available

Open-source identity and auth infrastructure with aDAU-based pricing

Switching Cost: moderate

P

Permit.io

Free tier available

Authorization-as-a-service platform with RBAC, ABAC, and ReBAC policy management

Switching Cost: significant

P

PropelAuth

Free tier available

B2B authentication with built-in organization management, RBAC, SAML SSO, and customizable UIs

Switching Cost: significant

S

Stack Auth

Free tier available

Open-source Auth0/Clerk alternative with managed hosting or free self-hosting, built for Next.js

Switching Cost: drop-in

S

Stytch

Free tier available

Authentication and identity platform with passwordless and B2B auth

Switching Cost: significant

S

SuperTokens

Free tier available

Open-source auth with managed hosting and per-MAU add-on pricing

Switching Cost: moderate

U

Unkey

Free tier available

API key management and rate limiting infrastructure for developers

Switching Cost: moderate

W

WorkOS

Free tier available

Enterprise-ready authentication and identity platform with SSO, directory sync, and user management

Switching Cost: significant

Z

Zitadel

Free tier available

Open-source identity management with DAU-based cloud pricing

Switching Cost: moderate