Security & Auth
Free Authentication & User Management
Discover 26+ free authentication & user management tools and services for developers. All resources include generous free tiers or are fully open-source.
6curated resources
Auth0
Free up to 7,500 active users and unlimited logins. Universal login, MFA, social login.
auth0.com
Clerk
Authentication and user management. Free: 10,000 monthly active users.
clerk.com
Firebase Auth
Free authentication service: 10K verifications/mo phone auth, unlimited email/password.
firebase.google.com
Supabase Auth
Open-source auth with row-level security. 50K monthly active users free.
supabase.com
Logto
Open-source auth infrastructure. Free: up to 50K MAU, social connectors, RBAC.
logto.io
Permit.io
Authorization as a service. Free: up to 1,000 monthly active users.
www.permit.io