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Developer Tools · head to head

Keycloak vs Statsig

Keycloak logo

Keycloak

Developer Tools

Open-source identity and access management server.

From
Free
Free plan
Yes
Visit KeycloakFull review
Statsig logo

Statsig

Project Management

Unified platform for feature flags, A/B testing, and product analytics

From
Free
Free plan
Yes
Visit StatsigFull review

The short version

  • Keycloak is an open-source IAM platform supporting OpenID Connect, OAuth 2.
  • Keycloak is free; Statsig starts at $150/mo.
  • Where Keycloak falls short: requires self-hosted deployment and operational expertise to install, configure and maintain.
  • Where Statsig falls short: pro plan is limited to a single project, requiring Enterprise for multi-project support.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

Only the attributes on which Keycloak and Statsig actually diverge.

Attributes where Keycloak and Statsig differ
AttributeKeycloakStatsig
Pricing modelOpen-sourceFreemium
PlatformsSelf-hosted, Linux, Windows, APIWeb, API
CategoryDeveloper ToolsProject Management

Identical on both: starting price (Free), free tier (Yes).

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 Statsig does not also cover.

Only in Statsig

  • Feature Flags
  • Experimentation
  • Product Analytics
  • Session Replay
  • Web Analytics
  • Warehouse-Native Deployment
  • Role-Based Access & SSO

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 Statsig
  • Companies with existing LDAP/Active Directory systems needing federated authenticationnot Statsig
  • Open-source projects and communities requiring free IAM without licensing costsnot Statsig
  • Enterprises building custom identity workflows requiring fine-grained authorisationnot Statsig
  • Teams with sufficient operational expertise to manage infrastructurenot Statsig

Statsig

  • Rolling out features gradually with kill switchesnot Keycloak
  • Running A/B tests with statistical rigornot Keycloak
  • Tracing metric regressions to specific releasesnot Keycloak
  • Consolidating analytics and experimentation toolingnot Keycloak
  • Warehouse-native experimentation for data teamsnot 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

Statsig

  • Pro plan is limited to a single project, requiring Enterprise for multi-project support
  • Overage pricing on the Pro plan can become costly for high-event-volume products
  • Warehouse-native deployment and advanced access controls are gated behind custom Enterprise contracts
  • Free tier session replay and analytics retention are capped, pushing active teams toward paid tiers quickly

Pricing, plan by plan

Keycloak

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

Statsig

Free
  • DeveloperFree
    • 2M events/month
    • Unlimited flag & config checks
    • 50,000 session replays/month
  • Pro$150/mo
    • 5M events included, then $0.05 per 1K events
    • Advanced experimentation & analytics
    • Unlimited analytics retention
  • EnterpriseOn request
    • Volume-discounted event/experiment contracts
    • Warehouse-native deployment
    • SSO & role-based access controls

Which should you pick?

Choose Keycloak if

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

Choose Statsig if

  • You need feature flags.
  • You want to start without paying.
  • You work on Web, API.
  • You also want experimentation.
Statsig review

Questions people ask

Is Keycloak or Statsig better?
Neither clearly leads. Keycloak starts at Free and Statsig at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keycloak or Statsig?
Keycloak starts at Free and Statsig at Free.
Does Keycloak or Statsig run on more platforms?
Keycloak runs on Self-hosted, Linux, Windows, API. Statsig runs on Web, API.
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 Statsig is typically brought in for.
What can Keycloak do that Statsig cannot?
Statsig covers Feature Flags, Experimentation, Product Analytics, Session Replay.

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
Statsig: What does Statsig cost?

Statsig offers a free Developer tier, a Pro tier at $150/month with 5M included events and $0.05 per 1,000 events after that, and custom Enterprise pricing based on event or experiment volume.

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
Statsig: Is there a free plan, and what are its limits?

The free Developer plan includes 2M events per month, unlimited flag and config checks, 50,000 session replays per month, and 1-year analytics data retention with unlimited seats.

Source
Keycloak: Is Keycloak free?

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

Source
Statsig: How is usage metered on Statsig?

Statsig meters billable events including exposures with Metric Lifts enabled, log events from SDKs or imports, ingested warehouse metrics, and custom metrics; disabled flag checks are not metered.

Source
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