Stack Auth vs Keycloak: Which Should You Choose in 2026?
Choosing between Stack Auth and Keycloak comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Stack Auth
Open-source authentication and user management for developers, designed for rapid integration and flexibility.
Best for you if:
- • Open-source authentication and user management suite.
- • Offers features like RBAC, organizations, and 3rd-party OAuth.
Keycloak
Open-source identity and access management
Best for you if:
- • You want the higher-rated option (8.8/10 vs 0.0/10)
- • You need something completely free
- • Keycloak is an open-source identity and access management solution
- • It provides SSO, social login, and user federation for applications and services
| At a Glance | ||
|---|---|---|
Price | Free + Paid | Free |
Best For | Identity & Access | Identity & Access |
Rating | —/100 | 88/100 |
| Feature | Stack Auth | Keycloak |
|---|---|---|
| Pricing Model | Freemium | Free |
| Editorial Score | — | 88 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | Identity & Access | Identity & AccessPassword Managers |
Understanding the Differences
Both Stack Auth and Keycloak solve similar problems, but they approach them differently.Stack Auth positions itself as "open-source authentication and user management for developers, designed for rapid integration and flexibility." while Keycloakfocuses on "open-source identity and access management". These differences matter depending on what you're trying to accomplish.
When to Choose Stack Auth
Stack Auth makes sense if you're looking for a budget-friendly option with a free tier solution.
When to Choose Keycloak
Keycloak is worth considering if you need a free tool. Scoring 88/100, it edges ahead in our evaluation.
Who Should Use What?
Bootstrapped or small team?
When every dollar counts, Stack Auth lets you get started without pulling out your credit card.
We'd pick: Stack Auth
Growing fast?
Your team doubled last quarter and you need tools that won't break when you add 50 more people. Keycloak is built for teams that are leveling up.
We'd pick: Keycloak
Enterprise with complex needs?
You need SSO, compliance certifications, and a support team that picks up the phone. Both have enterprise tiers—compare their security features.
We'd pick: Keycloak
Still not sure? Answer these 3 questions
How much can you spend?
Zero budget? Keycloak won't cost you anything.
Do you care what other users think?
Both have similar review counts. Read a few before you commit.
Expert opinion or crowd wisdom?
Our team rated Keycloak higher (88/100). But the community has upvoted Keycloak more (0 votes). Pick your source of truth.
Key Takeaways
What Keycloak Does Better
- Higher overall score (88/100)
- Our recommendation for most use cases
Consider Stack Auth If
- You want to start free and scale later
- Its specific features better match your workflow
- You prefer its interface or design approach
The Bottom Line
If we had to pick one, we'd go with Keycloak (88/100). But the honest answer is that "better" depends on your situation. Keycloak scores higher in our analysis, but Stack Auth might be the right choice if its specific strengths align with what you need most. Take advantage of free trials to test both before committing.
Frequently Asked Questions
Is Stack Auth or Keycloak better?
Based on our analysis, Keycloak scores higher with 88/100. Stack Auth isfreemium while Keycloak is free. The best choice depends on your specific needs and budget. We recommend testing both with free trials if available.
Can I switch from Stack Auth to Keycloak easily?
Migration difficulty varies. Check if both tools support data export/import in compatible formats. Some tools offer migration assistance or have integration partners who can help with the transition.
Do Stack Auth and Keycloak offer free trials?
Most software in this category offers free trials or free tiers. Stack Auth is freemium with a free tier.Keycloak is completely free. Visit their websites for current trial offers.