Identity, access, and ownership - shared across all your apps
Simezu is the central authentication and authorization layer for multi-application ecosystems. It provides a single source of truth for users, groups, permissions, and sessions across everything you build.
Why Simezu exists
Most authentication systems are designed for single applications.
Real systems aren't.
Users move between apps.
Groups own resources.
Permissions need to stay consistent.
Sessions shouldn't break at every boundary.
Simezu exists to solve this at the core - by acting as a shared identity and ownership layer, not just a login service.
A shared model, not just tokens
Simezu is built around structure, not features.
Users belong to groups
Groups own data and actions
Permissions are enforced centrally
Sessions are shared across applications
Every connected application consumes the same model and the same truth.
Designed for ecosystems
Simezu supports multiple applications out of the box, all connected through one identity layer.
Single sign-on across all apps
Shared sessions and permissions
Centralized access control
Consistent user and group logic
Shared ownership, including payments
No duplication. No sync jobs. No edge-case permission drift.
Example: shared identity and permissions
// Fetch the current user from the central identity layer
$user = Simezu::me();
// Check a shared permission across applications
if ($user->can('publish', 'group:boyle')) {
// Allowed everywhere, enforced once
}This logic works the same in every connected application.
Built-in security (by default)
Security is not optional infrastructure.
Argon2id password hashing
JWT-based session handling
Rate limiting and audit logging
Token vault and permission checks
Scalable by design
Simezu is designed to grow with your system.
Optimized queries and session handling
Stateless APIs
Horizontal scaling ready
Proven in high-load, multi-app setups
Documentation-first
Simezu is built for developers who want clarity.
Complete API reference
Implementation guides
Code examples
Clear boundaries and guarantees
Built for ecosystems — human and AI
Simezu gives every actor in your platform a verified identity — not just human users.
Users
Authenticated individuals with shared sessions, group memberships, and scoped permissions across all connected apps.
Groups
Collective actors that own resources, hold permissions, and drive shared access logic inside your ecosystem.
AI Agents
Automated actors that operate on behalf of users or groups — with scoped credentials, enforced permissions, and a clear identity in every session context.
Consuming applications receive an actor_type in every session — so your code always knows who or what is acting.
European infrastructure
Simezu is self-hosted and GDPR-native by design. No data leaves your infrastructure. No third-party tracking. No vendor lock-in on your users' identities.
Building your own platform?
Kimezu brings the full Simezu infrastructure to your ecosystem — white-label identity, payments, and access control. Your brand, your rules, your data.
Learn about KimezuSystems built on Simezu
Simezu is already used as the foundation for multiple connected systems.
Simezu Core
The central platform managing users, groups, roles, permissions, payments, and sessions.
- User & group management
- Central access control
- API authentication
Wemazu
Deployment and project management using Simezu for authentication and authorization.
- Unified access
- Shared sessions
- Centralized identity
Simuze
Music discovery and network built on Simezu's identity and session model.
- Single sign-on
- Shared permissions
- Centralized user context
Start building on solid ground
If you're building more than one application, you need more than isolated authentication.
Simezu provides the foundation.