Logto vs Keycloak: Modern DX vs Enterprise Power

Two very different philosophies for open source authentication. Logto is built for developers who want Auth0-like simplicity. Keycloak is built for enterprises that need every identity protocol under the sun. Here's how to choose.

Quick Verdict

Choose Logto for the best developer experience — fastest setup, prettiest UI, SDKs for every framework, ideal for startups and SaaS products. Choose Keycloak for maximum enterprise capability — SAML, LDAP, Active Directory, Kerberos, fine-grained authorization.

The Comparison

Feature	Logto	Keycloak
Language	TypeScript/Node.js	Java (Quarkus)
OIDC/OAuth 2.0	✅	✅
SAML 2.0	✅ (basic)	✅ (most complete)
LDAP	❌	✅ (federation + outbound)
Active Directory	❌	✅ (best support)
Kerberos	❌	✅
Social login	✅ (30+ connectors)	✅
MFA/2FA	✅	✅
Passkeys/WebAuthn	✅	✅
Passwordless	✅	✅
Pre-built sign-in UI	✅ (beautiful)	✅ (functional)
SDKs	✅ (15+ frameworks)	Client adapters
Management API	✅ (REST)	✅ (REST)
Management console	✅ (modern)	✅ (dated)
Organizations	✅	Realms
Machine-to-machine	✅	✅
Custom JWT claims	✅	✅
Webhooks	✅	Event listeners
Fine-grained authz	Basic RBAC	✅ (UMA, policies)
User federation	❌	✅ (best)
RAM usage	512 MB–1 GB	2–4 GB
Setup time	15 minutes	1–2 hours
Stars	9K+	24K+
License	MPL-2.0	Apache 2.0

When to Choose Logto

• Developer experience is the top priority
• You're building a SaaS or consumer-facing product
• You want pre-built, beautiful sign-in pages out of the box
• Framework SDKs (Next.js, React, Vue, Express) matter
• You're a startup or small team
• Coming from Auth0 and want a similar experience
• TypeScript/Node.js ecosystem fits your team
• Low resource footprint needed

When to Choose Keycloak

• Enterprise is the primary use case
• SAML 2.0 is a hard requirement
• LDAP/Active Directory federation is needed
• Fine-grained authorization (UMA, resource-based policies)
• Kerberos SSO for Windows environments
• Identity brokering across multiple IdPs
• Government or regulated industry compliance
• Java ecosystem is familiar

The DX Gap

Logto's standout is developer experience. Adding auth to a Next.js app:

// Next.js — 3 files to complete auth
// 1. Environment variables
// LOGTO_ENDPOINT=https://your-logto.com
// LOGTO_APP_ID=your-app-id
// LOGTO_APP_SECRET=your-secret

// 2. Auth configuration
import LogtoClient from '@logto/next';

export const logtoClient = new LogtoClient({
  endpoint: process.env.LOGTO_ENDPOINT,
  appId: process.env.LOGTO_APP_ID,
  appSecret: process.env.LOGTO_APP_SECRET,
});

// 3. Protected route
export default async function Dashboard() {
  const { isAuthenticated, claims } = await logtoClient.getLogtoContext();
  if (!isAuthenticated) redirect('/api/logto/sign-in');
  return <h1>Welcome, {claims?.name}</h1>;
}

Keycloak requires more configuration but handles scenarios Logto can't — like federating users from Active Directory, setting up SAML SSO for enterprise clients, or implementing fine-grained resource-based authorization.

The Bottom Line

Logto is the right choice when developer experience matters most — startups, SaaS products, and teams that want to ship auth fast. Keycloak is the right choice when enterprise requirements matter most — SAML, LDAP, AD federation, and compliance.

If you're building a consumer product or SaaS, start with Logto. If you're selling to enterprises that require SAML SSO, you'll eventually need Keycloak (or add SAML support to Logto's growing feature set).

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