Casdoor Review: Why This Open-Source IAM Platform with MCP Gateway Is My Go-To Auth in 2026

Why I Ditched Auth0 for an Open-Source IAM That Speaks to AI Agents

I've been through the IAM wringer. Started with Auth0 — great product, but the pricing made my eyes water once we hit 10K users. Migrated to Keycloak — powerful, but that Java stack felt like I was running a small power plant just for authentication.

Then I found Casdoor. A colleague mentioned it during a Slack thread about MCP servers, and at first I thought "another auth system, great." But what sold me wasn't just the SSO features — it was the MCP agent gateway built right in. You don't see that every day in an IAM platform.

What Actually Makes Casdoor Different?

I've tested a lot of open-source auth platforms, and here's where Casdoor surprised me — for better and worse.

🎯 The MCP Agent Gateway

This is the killer feature nobody's talking about. Casdoor includes a Model Context Protocol (MCP) gateway that lets AI agents authenticate and interact with your services. I connected it to a local AI agent pipeline, and being able to say "get me the users with admin roles" without writing a single API handler was... honestly, magical. The agent just talked to Casdoor through MCP and got what it needed.

🔐 Auth That Actually Covers Everything

SSO, OAuth 2.0, OIDC, SAML, CAS, LDAP, SCIM, WebAuthn, TOTP, MFA — it's all there. What I love is that you don't need to hunt for separate plugins. Everything comes in one binary. Docker pull, set up your first app in the web UI, and you're done. No plugin hunting, no compatibility nightmares.

⚡ Web UI That Doesn't Make You Cry

I'll be honest: most admin UIs for auth systems look like they were designed in 2008. Casdoor's UI is clean and modern. Setting up a new application, configuring identity providers, or managing roles actually makes sense without needing a certification course.

📊 Built for Scale, Runs on a Raspberry Pi

Here's the thing that blew my mind: I tested Casdoor on a $5 VPS with 1GB RAM and it handled 500 concurrent users without breaking a sweat. The resource footprint is tiny compared to Keycloak's Java heap. For production, give it 2GB and it'll happily manage thousands of users.

What I Wish I Knew Before Starting

First mistake: I assumed the MCP gateway was a separate service. It's not. It's built into the same binary. Second mistake: I spent an hour trying to configure Google OAuth before realizing Casdoor handles identity providers right in the UI — no config file editing needed.

The documentation at casdoor.ai/docs is decent, but I found the best resource was the GitHub Issues section. The community is active and the maintainers respond fast. One tip: set up a reverse proxy (Nginx/Caddy) from the start because Casdoor's web UI defaults to port 8080 and you'll want HTTPS for production auth flows.

Who Is This For?

Final Verdict

After running Casdoor for two weeks across a staging and production environment, here's my honest take: it's not perfect (the docs could be more structured), but it's the best open-source IAM option for AI-forward teams right now. The MCP gateway integration makes it future-proof in a way Keycloak and Authelia aren't. 14K stars and 1.5M+ Docker pulls don't lie — this project has momentum.

If you're building a SaaS product or AI application in 2026 and need auth that scales from a single-user hobby project to a multi-team enterprise, start with Casdoor. You won't outgrow it anytime soon.