At a Glance:
Logto is an open-source auth infrastructure for SaaS and AI apps, providing built-in multi-tenancy, enterprise SSO, RBAC, and pre-built sign-in flows with OIDC, OAuth 2.1, SAML, and MCP support.
Overview:
Logto is an open-source authentication infrastructure designed for building identity into SaaS applications and AI platforms. It provides a ready-to-use auth layer that avoids the complexity of implementing OIDC, OAuth 2.1, and SAML directly. The platform ships with multi-tenancy, organization management, enterprise SSO, and role-based access control. It also supports the Model Context Protocol for agent-based AI architectures. Logto offers both a fully managed cloud service and a self-hosted open-source version. Integration is handled through SDKs for over 30 frameworks, including React, Next.js, Go, and Python, along with connectors for external identity providers.
Key Decision Points:
Deployment options: Available as a fully managed cloud service or as a self-hosted open-source version for teams that want to run their own auth infrastructure.
Protocol support: Works natively with OIDC, OAuth 2.1, and SAML, removing the need for custom protocol implementations or additional bridging services.
Tenancy and organization model: Ships with built-in multi-tenancy, organization RBAC, member invites, and just-in-time provisioning, making it applicable for platforms that serve multiple customer orgs.
AI and agent readiness: Explicitly designed to work with the Model Context Protocol and agent-based architectures, supporting auth patterns beyond traditional user-facing web sessions.
Client and framework support: Provides SDKs for 30+ frameworks and can connect to SPAs, web apps, mobile apps, APIs, machine-to-machine services, and CLI tools.
Core Features:
Multi-tenancy and organizations: Organization-level RBAC, member invitations, and just-in-time provisioning are available out of the box.
Enterprise SSO with SAML and OIDC: Supports enterprise single sign-on through standard SAML and OIDC connections to providers like Azure AD and Okta.
Pre-built sign-in flows with custom UI: Customizable authentication flows covering sign-up, sign-in, social login, Google One Tap, MFA, and SSO.
Model Context Protocol support: Works out-of-the-box for MCP, enabling auth for agent-based AI architectures without additional configuration.
SDKs for 30+ frameworks: Client libraries covering React, Next.js, Angular, Vue, Flutter, Go, Python, and other languages and frameworks.
Connectors for external IdPs: Built-in integration with Google, Facebook, Azure AD, Okta, and other identity providers.
Use Cases:
SaaS platforms that need to ship multi-tenant auth with per-organization RBAC and enterprise SSO without building identity from scratch.
Development teams building AI applications or agent-based systems that require auth support for the Model Context Protocol.
Projects that span multiple client types — SPAs, web apps, mobile apps, APIs, and CLI tools — and need a single auth provider with consistent SDK coverage.
Self-hosted environments where the auth layer must remain under operational control while still supporting standard protocols like OIDC and SAML.
Open-Source Alternative Value:
Logto is available as a self-hosted, open-source auth infrastructure under the MPL-2.0 license. It includes the same multi-tenancy, enterprise SSO, RBAC, and protocol support in the open-source version that powers its managed cloud service. Developers can integrate it with SPAs, mobile apps, APIs, machine-to-machine services, and CLI tools using the provided SDKs. The project explicitly supports modern use cases such as Model Context Protocol and agent-based AI architectures, giving teams building on these patterns an open source option for identity that is designed with their requirements in mind rather than retrofitted.
