Discover the best authentication providers for MVPs & SaaS prototypes in 2026: Firebase Auth, Supabase, Clerk, NextAuth.js, Auth0 & more. Free/open-source options with OAuth integrations (Google, LinkedIn, Twitter/X, GitHub, Facebook), secure login, easy Next.js setup, no custom backend. Curated for indie hackers, startups to ship faster.
Curated by
Created on 10 March 2026
7 tools
NextAuth.js
Authentication for Next.js
Free•Open Source+1
Supabase Auth
Built-in user management for Supabase projects
DevOps•Developer Tools+3
Clerk
Authentication and User Management Made Easy
APIs & SDKs•Developer Tools+3
Firebase
Google's Mobile and Web App Development Platform
APIs & SDKs•Developer Tools+3
Auth0
Secure AI Agent & User Authentication
AI•Compliance Tools+3
Lucia
Simple and flexible auth library for TypeScript
APIs & SDKs•DevOps+3
Better Auth
Own Your Auth. The most comprehensive authentication framework for TypeScript.
APIs & SDKs•Developer Tools