Best 20+ Tools for Fullstack Developers in 2025

PropelAuth is a tool that adds user authentication to your business software. It provides ready-made login pages, signup forms, and user management screens that you can customize with your brand colors and logo.

Better Auth is a framework-agnostic authentication library that runs directly in your application. It handles user accounts, login sessions, and security features without relying on external services. You keep full control of your user data because everything runs on your own database and server.

Auth.js is a complete authentication solution that works across different JavaScript frameworks. It provides everything needed to add secure login systems to websites and applications. You can let users sign in through their existing accounts on services like Google or GitHub, or you can use email-based magic links, or even traditional username and password combinations.

Tesseral is a complete authentication system designed for business-to-business software applications. It handles user login, permission management, and security features so developers can focus on building their main product.

Authorizer is a tool that adds login and user management to your website or app. You connect it to your existing database, and it creates a complete system for users to sign up, log in, and manage their accounts. Unlike paid services, you own all the code and data.

Stytch is an authentication service that helps developers add login and security features to their websites and mobile apps. Instead of building authentication from scratch, developers can use Stytch's ready-made tools and code libraries to quickly set up secure user login.

Amazon Cognito is a cloud service that manages user authentication and authorization for applications. It has two main parts: user pools and identity pools. User pools store user profiles and handle login, while identity pools give users access to AWS resources.

Stack Auth is a complete authentication solution that handles all the complex parts of user login and management. When you add it to your application, you get ready-made login pages, account settings, password reset flows, and user dashboards without writing code for these features yourself.

Logto is an authentication and identity management platform that handles user sign-in, permissions, and security for your applications. You can use it as a cloud service or install it on your own servers since it's open-source.

SuperTokens is an authentication framework that handles user login, registration, and session management for your applications. It provides ready-made solutions for email password login, social login through providers like Google and Facebook, passwordless authentication using magic links or one-time codes, and more.