Logto

Adding authentication to an app is one of those jobs that's deceptively deep — sessions, social login, SSO, MFA, multi-tenancy — and getting any of it subtly wrong is a security risk. Logto is a modern, developer-focused answer: 'modern auth infrastructure for developers' that gives you enterprise-grade identity without building it all yourself.

Everything auth, out of the box

Logto is an authentication and identity platform that adds multi-tenancy, enterprise SSO and role-based access control to your applications. It supports the OAuth 2.1 and OIDC standards with passwordless sign-in, social login, multi-factor authentication and even machine-to-machine auth for services and agents. That breadth means you're not bolting on separate tools for each piece — the whole identity layer comes from one platform, correctly implemented. It sits alongside open auth tools like SuperTokens and Ory.

Pre-built experiences, full control

Logto ships pre-built sign-in experiences so you can get a polished login flow running fast, plus a Management API for full programmatic control when you need to customize. It integrates with 20+ frameworks including Next.js, React, Vue, Angular and Go, so it drops into whatever you're building with. That balance — quick to start, deep when you need it — is exactly what developers want from an auth provider.

Cloud or self-hosted, your data your region

Logto offers both cloud-hosted and self-hosted deployment, with data centers across the EU, Australia, US and Japan — so you can keep user data in the region you need for compliance, or run it entirely yourself. That flexibility is a meaningful edge over closed providers that dictate where your identity data lives.

Grows with you, predictably

Because Logto is built for SaaS and B2B multi-tenant systems from the start, it scales as you move upmarket rather than forcing a re-platform when you land your first enterprise customer.

Who it's for

Logto suits developers and technical teams building SaaS applications, AI products, B2B platforms and multi-tenant systems who need enterprise-grade authentication without extensive custom development.

Pricing

Logto is freemium with token-based, pay-as-you-go pricing and a genuinely generous free tier of 50K monthly active users — with no hidden billing surprises. That large free MAU allowance means many apps can run on Logto free for a long time, a stark contrast to auth providers that charge steeply per user.

Bottom line: Logto is modern, open-source auth infrastructure — SSO, MFA, multi-tenancy and pre-built flows across 20+ frameworks, cloud or self-hosted — with a 50K-MAU free tier that makes it an easy, cost-effective alternative to closed identity providers.