Firebase vs Keycloak
The ultimate side-by-side head-to-head analysis for 2026.
Short answer
- Price: not directly comparable — Firebase is free tier available, Keycloak is free.
- How to start: Firebase is free tier available, Keycloak is free.
These lines are generated from the pricing we track, not from a paid placement. We do not publish a quality score, because we do not have one we can stand behind. They cannot tell you which tool fits your workflow — the sections below are there for that. How we score tools.
Firebase
Keycloak
Category
Developer Tools
Developer Tools
Base Price
Free tier
Free
Public API
Yes
Yes
Mobile app
Yes
No
Open source / self-hostable
No
Yes
SSO (SAML)
Yes
Yes
Choose Firebase if:
Mobile App Developers and Rapid Prototyping Specialists.
Choose Keycloak if:
Organisations that need enterprise identity without a per-user bill.
Firebase: pros & cons
- Speed: Set up a functioning backend and auth system in as little as one day.
- Google Synergy: Works perfectly with Google Analytics and Google Cloud Platform.
- Cömert Free Plan: Costs are zero for many small to medium-sized projects.
- Real-Time Sync: The leader for apps needing instant data updates like chat apps.
- Lock-In: Moving away from Firebase is very difficult due to its unique NoSQL structure.
- Query Limits: Not as flexible as SQL for very complex relational data queries.
- Cost Prediction: 'Pay-as-you-go' can strain budgets if traffic spikes unexpectedly.
Keycloak: pros & cons
- Full identity server at no licence cost
- Standards support including SAML and OIDC
- Complete control over user data
- Operating it is a real responsibility
- Administration console is dense
- Upgrades need care
Our verdict on Firebase
The strongest ecosystem for those who want to focus on features instead of server management.
Our verdict on Keycloak
The serious open-source answer to Auth0. Budget for the operations, because the licence saving is not free.