SuperTokens
Open source alternative to Auth0/Firebase Auth/Cognito
The Lens
SuperTokens is the open source authentication platform: signup, password reset, social login, multi-factor auth, without Auth0 prices or Firebase lock-in. It handles session management, email verification, passwordless login, and social OAuth out of the box.
Self-hosting is free with all features. The managed cloud has a free tier up to 5,000 monthly active users (MAUs), which covers most startups. Paid tiers kick in at scale.
The catch: the self-hosted version requires running a Java-based core service alongside your app. That's a real dependency: Java runtime, separate process, separate database. The cloud version eliminates this but you're trusting a smaller company with your auth. And the SDK ecosystem, while growing, is narrower than Auth0's. Check that your framework is supported before committing.
Free vs Self-Hosted vs Paid
open core**Self-hosted (free):** All features included: email/password, social login, passwordless, MFA, session management. Requires running the SuperTokens core (Java) with a PostgreSQL or MySQL database. No user limits.
**Cloud free tier:** Up to 5,000 MAUs. All auth features included. No credit card required.
**Cloud paid:** $0.02/MAU beyond 5,000. So 10,000 MAUs = $100/mo. 50,000 MAUs = $900/mo.
**Compared to Auth0:** Auth0's free tier is 7,500 MAUs but with significant feature restrictions. At 10,000 MAUs, Auth0's Essentials plan is $240/mo. SuperTokens is $100/mo, less than half.
**When to pay:** If you don't want to run Java in production. The cloud version is meaningfully cheaper than Auth0 at every tier.
Self-host free. Cloud free up to 5K MAUs, then $0.02/MAU, roughly half of Auth0's pricing.
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