No per-MAU billing. No vendor lock-in. No black boxes. Battle-tested Spring Boot identity infrastructure you can read, fork, and run anywhere.
Auth0 and Okta charge per Monthly Active User. A viral product launch can generate a $50,000 surprise bill. CIAM Platform charges by registered users — no surprises.
Proprietary SDKs and SaaS-only features make migration painful and expensive. With CIAM Platform, you own the code and the data.
You can't audit what you can't see. Regulated industries (fintech, healthcare, govtech) need full visibility into authentication logic and data handling.
An honest comparison with the most popular identity platforms.
| CIAM Platform | Auth0 | Keycloak | FusionAuth | |
|---|---|---|---|---|
| Self-hosted | ✓ | – | ✓ | ✓ |
| Open source | ✓ Apache 2 | – | ✓ Apache 2 | Community only |
| Data sovereignty | ✓ Full | SaaS only | ✓ Full | ✓ Full |
| Pricing model | Per tenant / user | Per MAU | Free + support | Per MAU |
| Multi-tenancy (native) | ✓ First-class | Org addon | Realms (complex) | ✓ |
| SAML 2.0 | ✓ | ✓ | ✓ | ✓ |
| WebAuthn Passkeys | ✓ | ✓ | ✓ | ✓ |
| Per-tenant JWT keys | ✓ Built-in | Shared by default | ✓ | ✓ |
| Kafka event streaming | ✓ Built-in | Webhooks only | Webhooks | Webhooks |
| Spring Boot / Java 21 | ✓ Java 21 | Node.js | ✓ Java | Java (custom) |
Your product serves dozens of B2B customers, each with their own users, roles, and SSO requirements. CIAM Platform's native multi-tenancy gives each customer an isolated identity space with their own subdomain, signing keys, and MFA policy — with a single deployment.
Your enterprise customers use Okta, Azure AD, or Google Workspace. CIAM Platform's SAML 2.0 SP and OIDC federation let them log in with their existing corporate credentials. JIT provisioning creates local accounts on first login, and SCIM keeps directory sync running automatically.
Compliance with SOC 2, HIPAA, or PCI-DSS requires full audit trails, data sovereignty, and the ability to demonstrate exactly how authentication works. CIAM Platform is open source — your security team can audit every line of code. All events flow to Kafka for your SIEM.
Millions of end-users with low-friction registration and passkey support for passwordless login. Java 21 virtual threads handle massive concurrent auth spikes. Valkey-backed rate limiting protects against credential stuffing at scale.
Your platform hosts third-party apps that need to act on behalf of users. OAuth2 Client Credentials and per-app scopes keep data access scoped correctly without developers handling user credentials.
Government and defense customers can't use SaaS identity providers. CIAM Platform runs entirely on-premise with zero external dependencies — all crypto is built-in. No phone-home, no telemetry, full network isolation.
Spring Authorization Server is the official, actively maintained OAuth2/OIDC implementation for the Spring ecosystem — backed by VMware, deployed in thousands of production systems.
Java 21 with Project Loom virtual threads means your auth server can handle 50,000+ concurrent connections on modest hardware without the operational complexity of reactive programming.
No proprietary framework to learn — standard Spring Security and Spring Data.
Independent Spring components you can read, audit, and extend.
No compiled black boxes — perfect for security audits and compliance.
| Auth framework | Spring Auth Server 1.3 |
| Runtime | Java 21 (virtual threads) |
| Database | PostgreSQL + RLS |
| Cache / Rate limit | Valkey / Redis (Lettuce) |
| Event streaming | Apache Kafka |
| Password hashing | Argon2id (primary) |
| Admin UI | React + Vite |
One docker compose up and your full CIAM stack is running. No credit card, no sales call.