---
canonical: https://thejudex.com/vs/fusionauth-vs-keycloak
title: FusionAuth vs Keycloak
type: SoftwareComparison
updatedAt: 2026-10-29T19:47:46.352Z
---

# Technical Comparison: FusionAuth vs Keycloak

> FusionAuth provides an API-first architecture with commercial licensing and flexible deployment, whereas Keycloak offers a comprehensive open-source Java-based solution, requiring higher resource consumption but with no base licensing costs.

## Capabilities and Pricing Summary

| Dimension | FusionAuth | Keycloak |
| :--- | :--- | :--- |
| Pricing Model | FREEMIUM | FREE |
| Starting Price | Free / Contact vendor | Free |
| Technical Rating | 4.6/5.0 | 4.6/5.0 |
| Verification | Verified | Verified |
| Markdown Card | [FusionAuth.md](https://thejudex.com/tool/fusionauth.md) | [Keycloak.md](https://thejudex.com/tool/keycloak.md) |

## Key Differentiators

- Licensing model: Commercial FusionAuth with a free tier vs. 100% open-source Keycloak under Apache-2.0.
- Tech stack and resource footprint: Java-based Keycloak with a higher memory footprint vs. API-optimized FusionAuth.
- Configuration management: FusionAuth prioritizes full API-driven automation, while Keycloak uses an admin console and Java SPIs.

## Switching Cost and Bidirectional Migration Friction (MFI)

| Migration Route | MFI Index (0-100) | Rating | Audited Critical Factors |
| :--- | :---: | :--- | :--- |
| From FusionAuth to Keycloak | 70/100 | Alto Lock-in | FusionAuth carece de exportación masiva nativa de datos documentada, lo que incrementa el riesgo de vendor lock-in.; Keycloak no expone API pública para sincronización automatizada, requiriendo importaciones manuales. |
| From Keycloak to FusionAuth | 70/100 | Alto Lock-in | Keycloak carece de exportación masiva nativa de datos documentada, lo que incrementa el riesgo de vendor lock-in.; FusionAuth no expone API pública para sincronización automatizada, requiriendo importaciones manuales. |

> MFI Verdict: La fricción de migración es simétrica (70/100 en ambas direcciones). Ambas plataformas exhiben barreras de cambio comparables en términos de exportación, APIs públicas y continuidad de credenciales.

## Technical Feature Matrix

| Feature | FusionAuth | Keycloak |
| :--- | :---: | :---: |
| REST & GraphQL API | Yes | Yes |
| SSO / SAML Authentication | Yes | Yes |
| Self-Hosted Option | Yes | Yes |
| Full Data Export | Yes | Yes |
| Role-Based Access Control (RBAC) | Yes | Yes |
| Custom Domains & SSL | Yes | Yes |
| Immutable Audit Logs | Yes | Yes |

## Frequently Asked Questions

### Q: What is the main difference between FusionAuth and Keycloak?
A: FusionAuth provides an API-first architecture with commercial licensing and flexible deployment, whereas Keycloak offers a comprehensive open-source Java-based solution, requiring higher resource consumption but with no base licensing costs.

### Q: Which is more affordable, FusionAuth or Keycloak?
A: FusionAuth has a starting price of Free / Contact vendor, while Keycloak starts from Free.

## Canonical Resources

- Web Comparison: https://thejudex.com/vs/fusionauth-vs-keycloak
- AEO Markdown Format: https://thejudex.com/vs/fusionauth-vs-keycloak.md
- Profile of FusionAuth: https://thejudex.com/tool/fusionauth
- Profile of Keycloak: https://thejudex.com/tool/keycloak