Lucia Has a Free Auth Library — Simple Authentication Without Auth-as-a-Service

A developer evaluated Auth0 ($23/month for 1,000 users), Clerk ($25/month), and Firebase Auth (free but vendor-locked). For a side project with 50 users, all felt like overkill.

Lucia is a free, lightweight auth library. Session-based authentication that YOU control. No external service, no vendor lock-in, no surprise pricing.

What Lucia Offers for Free

• Session Management - Secure cookie-based sessions
• Database Agnostic - Works with any database (Prisma, Drizzle, raw SQL)
• Framework Agnostic - Next.js, SvelteKit, Astro, Express, Hono
• OAuth - GitHub, Google, Discord, any OIDC provider
• Password Hashing - Built-in Argon2id/bcrypt
• Two-Factor - TOTP support for 2FA
• TypeScript - Full type safety
• Lightweight - No bloat, no magic, just functions

Quick Example

import { Lucia } from 'lucia'
import { PrismaAdapter } from '@lucia-auth/adapter-prisma'

const lucia = new Lucia(new PrismaAdapter(prisma.session, prisma.user))

// Create session
const session = await lucia.createSession(userId, {})
const cookie = lucia.createSessionCookie(session.id)

GitHub: lucia-auth/lucia - 10K+ stars

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