Clerk Alternatives in 2026: Why Developers Are Choosing Keycloak

Last updated: March 2026

Clerk made authentication easy for frontend developers. Its prebuilt React components, polished UI, and quick setup time earned it a loyal following among startups building on Next.js and Remix. But as teams scale, they run into friction: per-MAU pricing that grows linearly with users, limited protocol support, no LDAP/AD federation, no SCIM, and the fundamental constraint of a proprietary platform that controls your user data.

If you are evaluating alternatives to Clerk, you are likely hitting one or more of these walls. This guide covers five strong alternatives, compares them on the dimensions that matter most, and explains why a growing number of teams are landing on Keycloak.

Why Teams Look Beyond Clerk

The decision to move away from Clerk typically comes from one of these inflection points:

• Cost at scale. Clerk charges per monthly active user. At 100K MAUs, costs are significant. At 500K+, the economics become difficult to justify when open-source alternatives exist.
• Enterprise customer requirements. Your first enterprise deal requires SAML SSO, SCIM provisioning, or LDAP federation. Clerk’s SAML support is limited to enterprise plans, and it does not support SCIM or LDAP at all.
• Protocol limitations. Clerk supports OIDC but not SAML 2.0 as a service provider. If you need to federate with partners or integrate with legacy enterprise systems, you need broader protocol support.
• Data ownership. Regulated industries (healthcare, finance, government) often require full control over where user data is stored and processed. Clerk stores all user data on its own infrastructure.
• Backend flexibility. Clerk’s SDK is optimized for frontend-heavy architectures. If you are building microservices, APIs, or backend-heavy applications, you need a more flexible identity layer.

The Alternatives at a Glance

Platform	Type	Open Source	SAML 2.0	LDAP/AD	SCIM	Pricing Model
Keycloak (Skycloak)	Self-hosted / Managed	Yes (Apache 2.0)	Full	Yes	Yes	Free + hosting
Auth0	SaaS	No	Yes	Yes	Yes	Per-MAU
Stytch	SaaS	No	Enterprise	No	No	Per-MAU
Descope	SaaS	No	Yes	No	SCIM (Enterprise)	Per-MAU
WorkOS	SaaS	No	Yes	Yes	Yes	Per-connection

1. Keycloak with Skycloak Managed Hosting

Keycloak is the most feature-complete open-source identity platform available. It supports every major authentication protocol (OIDC, SAML 2.0, OAuth 2.0), provides built-in LDAP/AD federation, and offers customization depth that no SaaS platform can match.

Why teams choose it over Clerk

Keycloak covers the full spectrum of identity requirements: single sign-on across applications, multi-factor authentication with TOTP, WebAuthn, and SMS, identity brokering with any OIDC or SAML provider, SCIM 2.0 provisioning, RBAC with fine-grained authorization, and custom branding for login pages.

The main objection to Keycloak has always been operational overhead: running a Java application server, managing database backups, handling upgrades, and ensuring high availability. Skycloak eliminates this objection entirely. You get the full power of Keycloak without managing infrastructure, and pricing is flat rather than per-MAU.

Developer experience

Keycloak integrates with any framework that supports OIDC or SAML. For Next.js applications (where many Clerk users start), integration through NextAuth.js is straightforward:

// app/api/auth/[...nextauth]/route.ts
import NextAuth from "next-auth";
import KeycloakProvider from "next-auth/providers/keycloak";

const handler = NextAuth({
  providers: [
    KeycloakProvider({
      clientId: process.env.KEYCLOAK_CLIENT_ID!,
      clientSecret: process.env.KEYCLOAK_CLIENT_SECRET!,
      issuer: process.env.KEYCLOAK_ISSUER,
    }),
  ],
  callbacks: {
    async jwt({ token, account }) {
      if (account) {
        token.accessToken = account.access_token;
        token.idToken = account.id_token;
      }
      return token;
    },
    async session({ session, token }) {
      session.accessToken = token.accessToken;
      return session;
    },
  },
});

export { handler as GET, handler as POST };

Keycloak also has integration guides for React, Vue, Angular, SvelteKit, NestJS, Spring Boot, Django, Flask, FastAPI, and Go.

Pricing advantage

Keycloak is free. With Skycloak managed hosting, pricing is flat-rate with no per-MAU charges. Whether you have 10,000 or 1,000,000 users, the cost stays predictable. Use our ROI Calculator to model the difference.

Trade-offs

• Initial setup takes longer than Clerk’s drop-in components
• No prebuilt frontend components (you build your own or use Keycloak’s hosted login pages)
• Requires more identity management knowledge than “just add the SDK”

For a detailed head-to-head comparison, see our Keycloak vs Clerk analysis.

2. Auth0

Auth0 is the established incumbent in managed authentication. It offers a comprehensive feature set, extensive documentation, and broad framework support. Since the Okta acquisition in 2021, some teams have been nervous about pricing trajectory and product direction, but Auth0 remains a capable platform.

Strengths compared to Clerk

• Full SAML 2.0 support (both IdP and SP)
• LDAP/AD integration via AD Connector
• SCIM provisioning on enterprise plans
• More mature enterprise features (organizations, connection management)
• Broader backend SDK support

Weaknesses

• Pricing at scale is steep. Auth0’s per-MAU pricing can exceed Clerk’s at higher tiers, especially when enterprise features are needed.
• Vendor lock-in. Auth0 Actions and Rules are proprietary. Migrating away requires rewriting authentication logic.
• Complexity. Auth0’s feature set has grown complex over the years. Simple tasks sometimes require navigating multiple configuration layers.

Pricing

Auth0’s free tier covers 25,000 MAUs (more generous than Clerk). But enterprise features (SSO, SCIM, custom domains) require the Enterprise plan with custom pricing that can be significant.

For teams evaluating Auth0, see our Keycloak vs Auth0 comparison and Auth0 alternatives guide.

3. Stytch

Stytch focuses on passwordless authentication and developer experience. It offers an API-first approach with good documentation and quick integration for common use cases.

Strengths compared to Clerk

• Strong focus on passwordless flows (magic links, OTP, passkeys)
• API-first design that works well with backend architectures
• Device fingerprinting and fraud detection built in
• Good machine-to-machine authentication support

Weaknesses

• No LDAP/AD federation. Enterprise customers who need directory integration will hit a wall.
• Limited SAML. SAML SSO is available only on enterprise plans.
• No SCIM. Automated user provisioning is not supported.
• Smaller ecosystem. Fewer community resources and third-party integrations than Keycloak or Auth0.

Pricing

Stytch’s pricing is per-MAU with a free tier up to 25 organizations. Costs increase with MAU count, similar to Clerk’s model.

4. Descope

Descope positions itself as a “drag-and-drop” authentication platform. It provides a visual flow builder for designing authentication sequences, which can be appealing for teams that want customization without code.

Strengths compared to Clerk

• Visual flow builder for custom authentication sequences
• SAML SSO support
• Good passwordless support (magic links, OTP, passkeys)
• Flexible flow customization without backend code changes

Weaknesses

• No LDAP/AD federation. Like Clerk, it cannot integrate with on-premises directories.
• SCIM only on enterprise plans. Automated provisioning requires a premium tier.
• Relatively new. Smaller community and fewer production deployments than established alternatives.
• Per-MAU pricing. Same scaling cost problem as Clerk.

Pricing

Descope offers a free tier and per-MAU pricing on paid plans. Enterprise features require custom pricing.

5. WorkOS

WorkOS takes a different approach by focusing specifically on enterprise features: SSO, directory sync, SCIM, and audit logs. It is designed for SaaS companies selling to enterprise customers rather than as a complete authentication solution.

Strengths compared to Clerk

• Purpose-built for enterprise. SSO and directory sync are first-class features, not add-ons.
• Per-connection pricing. You pay per SSO connection rather than per user, which can be more predictable for B2B SaaS.
• SAML and OIDC SSO. Full support for both protocols.
• Directory sync. SCIM and direct integrations with major identity providers.
• Audit logs. Built-in audit trail for compliance.

Weaknesses

• Not a complete auth solution. WorkOS handles enterprise features but you still need a primary authentication system for non-SSO users.
• Limited consumer auth. Social login, passwordless, and basic email/password are available but are not the focus.
• Pricing can be high. Per-connection pricing is predictable but can add up with many enterprise customers.

When it makes sense

WorkOS is best when you have an existing authentication system and need to add enterprise SSO, SCIM, and directory sync on top of it. It complements rather than replaces your auth stack.

How to Choose

The right alternative depends on where you are and where you are going:

You need enterprise features now

If your first enterprise customer is asking for SAML SSO, SCIM, and LDAP integration, your realistic options are:

• Keycloak/Skycloak – All features included, no per-user premium
• Auth0 – Enterprise plan with all features, at a price
• WorkOS – Purpose-built for enterprise, but requires a complementary auth system

You want to control costs as you scale

If your user base is growing and you need predictable costs:

• Keycloak/Skycloak – Flat-rate pricing with no MAU charges
• Self-hosted Keycloak – Free, but you manage infrastructure

Use our ROI Calculator to model costs across different user counts.

You need maximum flexibility

If you need custom authentication flows, custom user stores, or deep protocol support:

• Keycloak – SPIs let you extend every aspect of the system. See our SPI development guide.

You just need it to work

If you are building an MVP and want the fastest path to production:

• Clerk (current choice) might still be fine for now
• Stytch or Descope offer similar speed with different strengths

Plan your migration for when you hit the enterprise/scale inflection point.

Migrating from Clerk to Keycloak

If you have decided to move from Clerk to Keycloak, here is the high-level migration path:

1. Set up Keycloak. Use Skycloak for managed hosting, or spin up a local instance with our Docker Compose Generator.

2. Export users from Clerk. Use Clerk’s Backend API to export all users:

// Export users from Clerk
const { users } = await clerkClient.users.getUserList({
  limit: 100,
  offset: 0,
});

const exportedUsers = users.map(user => ({
  username: user.username || user.emailAddresses[0]?.emailAddress,
  email: user.emailAddresses[0]?.emailAddress,
  firstName: user.firstName,
  lastName: user.lastName,
  // Note: password hashes are not exportable from Clerk
  // Users will need to reset passwords or use social login
}));

3. Import users to Keycloak via the Admin REST API:

# Create user in Keycloak
curl -X POST "${KEYCLOAK_URL}/admin/realms/my-realm/users" 
  -H "Authorization: Bearer ${ADMIN_TOKEN}" 
  -H "Content-Type: application/json" 
  -d '{
    "username": "[email protected]",
    "email": "[email protected]",
    "firstName": "Jane",
    "lastName": "Doe",
    "enabled": true,
    "requiredActions": ["UPDATE_PASSWORD"]
  }'

4. Reconfigure social providers. Set up the same OAuth providers (Google, GitHub, etc.) in Keycloak as identity providers.

5. Update application code. Replace Clerk’s SDK with standard OIDC integration. Since Keycloak uses standard protocols, you can use any OIDC client library.

6. Test thoroughly. Use Testcontainers to validate your authentication flows in CI.

For a similar migration from Auth0, see our Auth0 to Keycloak migration guide.

Evaluating Your Tokens

When testing any alternative, verify the tokens it produces. JWT structure, claim names, and signing algorithms vary across platforms. Use our JWT Token Analyzer to decode and inspect tokens during your evaluation.

For SAML-based SSO testing, our SAML Decoder helps you inspect SAML assertions and debug federation issues.

Further Reading

• Keycloak documentation
• Keycloak vs Clerk Comparison
• Keycloak vs Auth0 Comparison Guide
• Keycloak vs Okta Comparison
• Auth0 Alternatives: Open Source and Managed
• What Is the Cost of Self-Hosting Keycloak?

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Ready to move beyond per-user pricing? Skycloak provides fully managed Keycloak hosting with flat-rate pricing, enterprise features included, and SOC 2 certification. See pricing to get started.