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Developer Tools · head to head

Keycloak vs TanStack Start

Keycloak logo

Keycloak

Developer Tools

Open-source identity and access management server.

From
Free
Free plan
Yes
Full reviewWebsite
TanStack Start logo

TanStack Start

Web Development

Full-stack React framework with type-safe server functions and TanStack Router

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Keycloak requires self-hosted deployment and operational expertise to install, configure and maintain; TanStack Start still in Release Candidate status, not yet production stable
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Keycloak and TanStack Start actually diverge.

Attributes where Keycloak and TanStack Start differ
AttributeKeycloakTanStack Start
PlatformsSelf-hosted, Docker, Kubernetes, Linux, Windows, APIWeb
CategoryDeveloper ToolsWeb Development

Identical on both: starting price (Free), pricing model (open-source), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Keycloak

Nothing recorded that TanStack Start does not also cover.

Only in TanStack Start

  • Full-document SSR with streaming
  • Type-safe server functions
  • TanStack Router integration
  • Middleware system
  • Server routes and API endpoints
  • Experimental RSC support
  • Vite and Rsbuild support

What people use each for

The jobs each tool is most often brought in to do.

Keycloak

  • Organisations requiring self-hosted identity infrastructure for compliance or data residencynot TanStack Start
  • Companies with existing LDAP/Active Directory systems needing federated authenticationnot TanStack Start
  • Open-source projects and communities requiring free IAM without licensing costsnot TanStack Start
  • Enterprises building custom identity workflows requiring fine-grained authorisationnot TanStack Start
  • Teams with sufficient operational expertise to manage infrastructurenot TanStack Start

TanStack Start

  • Building type-safe full-stack React applicationsnot Keycloak
  • Projects requiring type safety across client and server boundariesnot Keycloak
  • Applications leveraging advanced routing patterns and nested layoutsnot Keycloak
  • Deployments across multiple platforms with consistent codebasenot Keycloak

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Keycloak

  • Requires self-hosted deployment and operational expertise to install, configure and maintain
  • No managed cloud option provided by Red Hat; organisations must operate infrastructure themselves or use third-party distributions
  • Clustering and high-availability configurations require additional operational knowledge
  • Community support only; commercial support requires third-party vendors or distributions

TanStack Start

  • Still in Release Candidate status, not yet production stable
  • Smaller community compared to Next.js with less third-party support
  • Documentation not as comprehensive as more established frameworks
  • Less mature ecosystem for edge deployment compared to specialized frameworks

Pricing, plan by plan

Keycloak

Free
  • Open-sourceFree
    • Full platform functionality
    • Self-hosted deployment
    • Community support

TanStack Start

Free

No published plan breakdown. See the TanStack Start review.

Which should you pick?

Choose Keycloak if

  • You want to start without paying.
  • You work on Self-hosted, Docker, Kubernetes, Linux, Windows, API.
Keycloak review

Choose TanStack Start if

  • You need full-document ssr with streaming.
  • You want to start without paying.
  • You also want type-safe server functions.
TanStack Start review

Questions people ask

Is Keycloak or TanStack Start better?
Neither clearly leads. Keycloak starts at Free and TanStack Start at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keycloak or TanStack Start?
Keycloak starts at Free and TanStack Start at Free.
Does Keycloak or TanStack Start run on more platforms?
Keycloak runs on Self-hosted, Docker, Kubernetes, Linux, Windows, API. TanStack Start runs on Web.
Can I use Keycloak for free?
Both have a free tier, so you can try either at no cost before committing.
What is Keycloak best used for?
Keycloak is most often used for organisations requiring self-hosted identity infrastructure for compliance or data residency, companies with existing ldap/active directory systems needing federated authentication, open-source projects and communities requiring free iam without licensing costs, enterprises building custom identity workflows requiring fine-grained authorisation. Of those, organisations requiring self-hosted identity infrastructure for compliance or data residency and companies with existing ldap/active directory systems needing federated authentication are not what TanStack Start is typically brought in for.
What can Keycloak do that TanStack Start cannot?
TanStack Start covers Full-document SSR with streaming, Type-safe server functions, TanStack Router integration, Middleware system.

Answered from the vendors’ own pages

Keycloak: What protocols does Keycloak support?

Keycloak supports OpenID Connect, OAuth 2.0 and SAML 2.0 protocols for authentication and authorisation.

Source
TanStack Start: Is TanStack Start production-ready?

TanStack Start is currently in Release Candidate status. While functional and used in production by some teams, it has not yet reached stable v1.

Source
Keycloak: Can Keycloak integrate with existing user directories?

Yes. Keycloak supports user federation with LDAP and Active Directory systems, allowing organisations to leverage existing user directories.

Source
TanStack Start: How do type-safe server functions work in TanStack Start?

Server functions are automatically typed on the client side, enabling IDE autocomplete and type checking when calling server functions from client code.

Source
Keycloak: Is Keycloak free?

Yes. Keycloak is fully open-source and free to deploy and use. No licensing fees are required.

Source
TanStack Start: What deployment platforms are supported by TanStack Start?

TanStack Start supports Cloudflare Workers, Node.js, Netlify, Railway, and other platforms through custom adapter configuration.

Source
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