Best Free SSO Options

 

🧰 Best Free SSO Options

ToolDescriptionFree?Protocols
KeycloakFully-featured open-source identity provider✅ 100% freeOpenID Connect, OAuth2, SAML
AuthentikLightweight, modern alternative to Keycloak✅ Free, open-sourceOIDC, SAML
IdentityServer (Duende)Free for development (IdentityServer v4 is OSS)✅ Dev onlyOIDC, OAuth2
GluuEnterprise-grade open source IAM✅ Community EditionOIDC, SAML
Firebase AuthenticationFree tier available✅ With limitsOIDC, custom tokens
Auth0Free for up to 7,000 active users✅ LimitedOIDC, OAuth2

🚀 Example: Setup Free SSO with Keycloak

🔹 Step 1: Run Keycloak Locally (with Docker)

bash
docker run -p 8080:8080 -e KEYCLOAK_ADMIN=admin -e KEYCLOAK_ADMIN_PASSWORD=admin quay.io/keycloak/keycloak:24.0.1 start-dev

  • Go to: http://localhost:8080

  • Login: admin / admin

🔹 Step 2: Create a Realm, Client, and Users

  1. Create a Realm (e.g., MyRealm)

  2. Create a Client:

    • Client ID: myclient

    • Client type: OpenID Connect → Confidential

    • Set redirect URI: https://localhost:5001/signin-oidc (for your app)

  3. Create a User:

    • Add user

    • Set username, email

    • Set password (under Credentials)

🔹 Step 3: Use in Your ASP.NET App

  • Use OpenID Connect middleware in ASP.NET (see earlier answer)

  • Set Authority to: http://localhost:8080/realms/MyRealm

  • Set ClientId and ClientSecret from Keycloak

🔐 Token Test

After login, your app will receive a JWT token. You can decode it at https://jwt.io and use it to authenticate with your Web API.

🧪 Minimal Dev SSO (For Learning)

Want something ultra-simple? You can:

  • Use a JSON file or SQLite to simulate user storage

  • Create a basic ASP.NET Web API that issues a JWT

  • Frontend redirects to login, gets token, and uses it for API requests

Let me know if you want this ultra-light "DIY SSO" version built from scratch!

👉 Summary

You can build or integrate free SSO using:

  • ✅ Keycloak — Best for full-featured local SSO

  • ✅ Authentik — Lightweight and great for self-hosted

  • ✅ Auth0 / Firebase — Free tiers for quick cloud-based setup

Would you like a downloadable SSO starter template (e.g., Keycloak + ASP.NET app) or a DIY C# token server example?

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