Logto
Open-source auth infrastructure for SaaS and AI apps
About Logto
Logto is a modern, open-source authentication and authorization platform built on OIDC and OAuth 2.1. It provides pre-built sign-in flows, multi-tenancy, enterprise SSO, RBAC, and SDKs for 30+ frameworks, making it easy to add production-ready auth to any application.
Pros & Cons
Pros
- Open-source with self-hosting option gives full data control
- Generous free tier supporting up to 50,000 monthly active users
- SDKs for 30+ frameworks make integration fast across any stack
- Modern protocol support with OIDC, OAuth 2.1, and SAML out of the box
- Built-in multi-tenancy ideal for B2B SaaS applications
Cons
- Smaller community compared to established players like Auth0 or Keycloak
- Self-hosted setup requires SRE expertise for production deployments
- Some advanced features like RBAC require paid add-ons on the Pro plan
- Relatively young company with a small team
Key Features
Multi-Tenancy
Group users, manage resources, and control permissions across multiple organizations
Enterprise SSO
Integrate with Okta, Microsoft Entra, SAML, and any identity provider for single sign-on
Multi-Factor Authentication
Add passkeys, authenticator apps, and backup codes for MFA in minutes
Role-Based Access Control
Define granular permissions at both global and organization levels with RBAC
30+ Framework SDKs
Pre-built SDKs for React, Next.js, Vue, Angular, iOS, Android, and more
Machine-to-Machine Auth
Secure API-to-API, microservice, and device communication with M2M tokens
Customizable Sign-In UI
Pre-built sign-in flows with fully customizable UI components and branding
OIDC & OAuth 2.1 Compliance
Full protocol support for OpenID Connect, OAuth 2.1, and SAML standards
Pricing
- Up to 50K MAU (100K tokens)
- 3 applications
- 1 M2M application
- 1 API resource
- Community support
- Unlimited MAU
- 100K tokens included
- Pay-as-you-go overage
- RBAC add-on available
- Priority support
- Custom contract pricing
- Dedicated support
- SLA guarantees
- Advanced compliance
- Custom integrations
Best For
SaaS Authentication
Add complete sign-up, sign-in, and user management to multi-tenant SaaS products
AI Application Auth
Secure AI agents and LLM-powered apps with token-based authentication and M2M flows
Enterprise Identity Management
Integrate with corporate identity providers via SSO and enforce role-based access policies
Developer Platform Auth
Provide OAuth-based authentication for developer platforms and API marketplaces
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