Logto

Logto is an open-source identity and access management platform for adding authentication and authorization to web, mobile, and API-based products. It provides standards-based login, enterprise SSO, and scalable multi-tenant identity management for SaaS and AI applications.

Key Features

• OAuth 2.1 and OpenID Connect provider for apps, SPAs, and APIs
• SAML-based enterprise SSO with common external IdPs
• Multi-tenancy via organizations, including invitations and provisioning flows
• Role-based access control for global and organization-scoped permissions
• Multiple sign-in methods: password, passwordless (email/SMS codes), and social login
• Multi-factor authentication options including passkeys, authenticator apps, and backup codes
• Customizable, pre-built sign-in experience and broad SDK/framework support
• Admin console for managing apps, users, roles, and authentication settings

Use Cases

• Add secure login and token-based API access to a SaaS product
• Implement enterprise-ready SSO and org-level access controls for B2B apps
• Centralize identity for multi-app ecosystems, including AI agents and tools

Limitations and Considerations

• Running at scale typically requires operating and tuning PostgreSQL and the service stack
• Advanced enterprise/security expectations may require careful configuration of SSO, MFA, and authorization models

Logto is a strong fit when you want a modern, standards-based auth system with multi-tenancy, SSO, and RBAC built in. It helps teams ship production-ready identity features without building and maintaining custom auth infrastructure from scratch.