SuperTokens

Building authentication yourself is famously a rabbit hole of edge cases and security footguns, but handing it to a closed service like Auth0 means giving up control and, often, paying dearly as you grow. SuperTokens offers a third path: open-source user authentication you can self-host, so you get pre-built auth without the lock-in.

Auth without the footguns

SuperTokens lets developers implement user login and session management across their apps using pre-built UI components or customizable SDKs. It supports the methods people actually use — email/password, magic links, passwordless and social login — so you're not reinventing the wheel or risking a subtle security bug in your session handling. The hard, easy-to-get-wrong parts of auth are handled for you, correctly.

Self-hosted, so you own it

The defining feature is its architecture: SuperTokens runs on a self-hosted model where you keep control over your authentication infrastructure and, crucially, your user data — while still benefiting from managed features. For teams that don't want their users' credentials living in a third party's cloud (for privacy, compliance or simply cost reasons), that ownership is the whole appeal. It's positioned squarely as a cost-effective, customizable alternative to Auth0 and AWS Cognito.

Fits your stack

SuperTokens integrates with 25+ frameworks including React, Node.js, Python and Go, so it slots into whatever you're already building with. And it doesn't skimp on the enterprise essentials, offering single sign-on, multi-tenancy and account linking — the features you eventually need as you move upmarket but often have to pay a premium for elsewhere.

Grows from startup to enterprise

Because it's open source and self-hostable yet enterprise-capable, SuperTokens scales with you rather than pricing you out as your user count climbs — a common pain point with per-MAU auth services.

Who it's for

SuperTokens suits startups and enterprises that want cost-effective, customizable authentication with full control over user data and infrastructure — anyone weighing the trade-offs of a closed auth provider and wishing for an open alternative.

Pricing

SuperTokens offers open-source self-hosted deployment (free to run yourself) alongside a managed SaaS version, with migration support and consulting available. That means you can start entirely free and self-hosted, then opt into managed convenience if and when you want it.

The economics are a big part of why teams switch: closed auth providers famously charge by monthly active user, so your bill balloons precisely as your product succeeds. Because SuperTokens is open source and self-hostable, growing your user base doesn't quietly inflate an auth invoice — which, for a scaling startup, can add up to very real savings while keeping the flexibility to customize flows exactly as you need them.

Bottom line: SuperTokens is open-source authentication that gives you pre-built login and sessions without the lock-in — a self-hostable, framework-friendly Auth0 alternative that keeps your users' data firmly in your hands.