Logto is an open-source identity and access management platform designed for developers building SaaS applications and AI-powered platforms. It eliminates the complexity of implementing OIDC, OAuth 2.1, and SAML by providing a production-ready, self-hostable authentication system with built-in multi-tenancy, enterprise SSO, and role-based access control. Unlike proprietary solutions like Auth0 or Firebase Authentication, Logto gives teams full ownership and control over their identity infrastructure while supporting modern architectures such as Model Context Protocol and agent-based systems. It’s ideal for engineering teams who need customizable, scalable auth without vendor lock-in or expensive cloud subscriptions.
Logto supports both cloud-hosted and self-hosted deployments, offering seamless integration with 30+ frameworks including React, Next.js, Angular, Vue, Flutter, Go, and Python. With pre-built sign-in flows, social login connectors, MFA, and just-in-time provisioning, Logto reduces weeks of auth development to a few hours. Its modular design allows developers to extend or replace components while maintaining compliance with industry standards.
What You Get
- Multi-tenancy and RBAC - Built-in support for organizations, member invites, and granular role-based access control without custom code or workarounds.
- Enterprise SSO and SAML support - Connect to identity providers like Google, Azure AD, Okta, and others using standardized SAML 2.0 and OIDC protocols.
- Pre-built sign-in flows - Ready-to-use UI components for signup, login, password reset, social login (Google, Facebook), Google One Tap, MFA (TOTP), and passwordless authentication.
- 30+ SDKs for modern frameworks - Official client libraries for React, Next.js, Angular, Vue, Flutter, Go, Python, and more to integrate auth in minutes.
- OIDC and OAuth 2.1 compliance - Full implementation of modern identity protocols with JWT support, authorization code flow, and PKCE out-of-the-box.
- Model Context Protocol & AI agent support - Designed to work natively with AI-driven applications and agent-based architectures requiring secure, context-aware identity.
- Self-hostable OSS with Docker - Deploy Logto locally or on your infrastructure using Docker Compose or Node.js with PostgreSQL, giving you full data control.
Common Use Cases
- Building a multi-tenant SaaS dashboard with RBAC - A B2B platform needs to isolate data between customers while allowing admin users to manage team roles; Logto provides organization membership and role assignments without custom database schemas.
- Creating a mobile-first AI app with passwordless login - An AI assistant app requires secure, frictionless authentication via email or SMS; Logto’s passwordless and MFA flows enable this with minimal code.
- Replacing Auth0/Cognito in a startup’s stack - A team wants to avoid vendor lock-in and high costs; they self-host Logto using Docker to reduce monthly auth expenses by 90% while maintaining feature parity.
- DevOps teams managing identity for microservices - Engineers need a centralized auth service that supports M2M (machine-to-machine) OAuth 2.0 client credentials flow for API security across Kubernetes clusters.
Under The Hood
Logto is an open-source identity platform designed to provide comprehensive authentication and user management capabilities with a strong emphasis on developer experience and extensibility. It offers a modular, well-structured approach to handling identity-related workflows in modern web applications.
Architecture
Logto adopts a modular monorepo architecture that promotes clear separation of concerns and reusable components across its ecosystem.
- The system is organized into distinct packages that encapsulate specific functionalities such as account management, API clients, and CLI tools
- Core logic is separated from UI components, enabling flexible integration and customization
- Layered design ensures that business logic remains decoupled from presentation concerns
Tech Stack
The project is built using modern web technologies with a focus on type safety and developer productivity.
- Built primarily with TypeScript and React, leveraging Vite for fast development and builds
- Employs a suite of libraries including i18next for localization, ky for HTTP requests, and SWR for data fetching
- Uses tsup for TypeScript compilation and pnpm for monorepo dependency management
- Integrates Vitest and ESLint to support automated testing and code quality enforcement
Code Quality
Logto maintains a mature approach to code quality with consistent testing and structured error handling practices.
- Extensive test coverage is present in key modules, particularly around API and connector logic
- Error handling follows structured patterns with custom error types for improved reliability
- Code consistency is maintained through standardized naming and architectural conventions
- Some legacy configurations indicate minor technical debt but overall codebase remains manageable
What Makes It Unique
Logto distinguishes itself through thoughtful architecture and developer-centric tooling that support rapid integration.
- Its modular monorepo design enables shared components and configurations while maintaining clear boundaries between packages
- Strong emphasis on internationalization and customizable UI elements allows for flexible, localized user experiences
- Comprehensive use of TypeScript and Zod ensures type safety and runtime validation across the API layer
- A developer-first approach is evident through extensive documentation, sample integrations, and tooling support