Keycloak vs Postman
The ultimate side-by-side head-to-head analysis for 2026.
Short answer
- Price: not directly comparable — Keycloak is free, Postman is free tier available.
- How to start: Keycloak is free, Postman is free tier available.
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 We do not publish a quality score, because we do not have one we can stand behind.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.
Keycloak
Postman
Category
Developer Tools
Developer Tools
Base Price
Free
Free tier
Public API
Yes
Yes
Mobile app
No
No
Open source / self-hostable
Yes
No
SSO (SAML)
Yes
Yes
Choose Keycloak if:
Organisations that need enterprise identity without a per-user bill.
Choose Postman if:
Backend Developers, QA Engineers, and Frontend Coders.
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
Postman: pros & cons
- Universal Standard: The most widely accepted and used API tool in the industry.
- Scripting Power: Write automated tests for every API request using JavaScript.
- Documentation: Transform your collections into stylish API docs with one click.
- Mock Servers: Allow frontends to keep working even before the backend is ready.
- Resource Usage: The desktop app can consume quite a bit of RAM during heavy work.
- UI Bloat: For those just wanting to send a simple request, the UI can be overwhelming.
- Cloud Reliance: Some collab features require data to be held on Postman's servers.
Our verdict on Keycloak
The serious open-source answer to Auth0. Budget for the operations, because the licence saving is not free.
Our verdict on Postman
An essential tool that every developer working with APIs must have on their machine.