FusionAuth
FusionAuth is the authentication and authorization platform engineered for developers who demand flexibility and control. Built from the ground up to integrate with any stack, every feature — from user registration to MFA and SSO — is exposed via a modern, well-documented API.
Support for every major identity protocol is included out of the box: OIDC, SAML, OAuth2, JWT, passwordless login, social sign-on, and more. Whether you’re building a greenfield app or retrofitting auth into a legacy system, FusionAuth adapts to your use case — not the other way around.
Need compliance? FusionAuth helps you meet GDPR, HIPAA, and COPPA standards quickly and reliably.
Deploy it your way: install on Linux, Windows, macOS, Docker, or Kubernetes — or go with FusionAuth Cloud, our managed SaaS hosting. No black boxes. No vendor lock-in. Just powerful, customizable auth that works the way you do.
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Auth0
Auth0 takes a modern approach to Identity and enables organizations to provide secure access to any application, for any user. Auth0 is highly customizable, and simple yet flexible. Safeguarding billions of login transactions each month, Auth0 delivers convenience, privacy, and security so customers can focus on innovation.
With Auth0, you can rapidly integrate authentication and authorization for web, mobile, and legacy applications, with new Fine Grained Authorization (FGA) that goes beyond role-based access control.
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SaaS Starter Kit
The SaaS Starter Kit is an advanced template tailored for developing Next.js applications efficiently and effectively. This template boasts a wide array of features, such as handling subscription payments through platforms like Lemon Squeezy or Stripe, a robust authentication system that includes both magic email sign-in and social OAuth login, and tools for subscription management accessible via customer portals. Additionally, it offers precise roles and permissions for enhanced access control, as well as multi-tenancy functionality, enabling users to set up organizations and invite team members. A modern, SEO-friendly blog is also part of the package, while email workflows are optimized using Resend and React Email. The user interface is designed with Shadcn and Tailwind CSS, allowing for straightforward customization and extension. The kit is responsive for mobile devices, features a fully integrated dark theme, and ensures dedicated support channels via Discord or Reddit. Users also enjoy lifetime free updates and comprehensive, current documentation that aids in quick onboarding and understanding of the codebase. Overall, this starter kit is an all-in-one solution for anyone looking to launch a SaaS product smoothly and effectively.
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31SaaS
31SaaS is a boilerplate built on Next.js 14, created to facilitate the swift development of stylish and contemporary SaaS applications. It incorporates a powerful technology stack that includes Tailwind CSS for quick and customizable design, Shadcn UI paired with Radix UI for accessible and modular components, React for crafting user interfaces, Appwrite as a reliable backend-as-a-service solution, Resend for efficient email delivery, Stripe for safe payment processing, and TanStack React Query & Table for effective data fetching and caching, alongside Content Layer for streamlined content management. Among its key features are user authentication via the Appwrite database, secure operations on both client and server sides, JWT generation for authenticating API calls, integration of payment processing, management of databases, email functions, blog creation, SEO enhancements, and optimizations for user experience. 31SaaS strives to offer a complete toolkit for rapidly launching a fully operational SaaS product while ensuring that developers have all necessary resources at their disposal. By combining these technologies, it aims to simplify the complexities of SaaS development, allowing creators to focus on innovation and user satisfaction.
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