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 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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SaaSy Land
SaaSy Land serves as an open-source starter template tailored for Next.js 14 full-stack projects, crafted to streamline the creation and deployment of SaaS offerings, marketing websites, blogs, and additional applications. It features sophisticated authentication options such as email verification, password resets, magic links, and OAuth provider integration, all powered by NextAuth. The template accommodates various database setups, ensuring efficient data handling and quick content delivery. Additionally, it comes with a Markdown and MDX-integrated blog system that supports SEO-friendly content management, along with Stripe integration for hassle-free online transactions and transactional email support via Resend and React Email. Utilizing Tailwind CSS and Shadcn UI components, SaaSy Land guarantees a contemporary and customizable aesthetic. Comprehensive documentation aids in straightforward customization, empowering developers to concentrate on the unique functionalities pertinent to their business. With everything meticulously configured and adhering to industry standards, you can significantly reduce both time and effort in your development process, ultimately allowing for a more efficient launch of your projects.
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Next.js Boilerplates
Solid serves as a powerful boilerplate and starter kit for Next.js, specifically designed to assist in the creation of fully operational SaaS websites for startups. It comes loaded with essential integrations that streamline the launch process for your upcoming SaaS venture. Equipped with a variety of crucial components and pages, Solid ensures a smooth launch while also providing other vital UI elements. Utilizing Solid makes the development of your SaaS product using Next.js and leading tech stacks incredibly straightforward and efficient. Among its standout features are the latest technologies such as Next.js 14, React, and TypeScript, which guarantee fast loading speeds, impressive functionalities, and an exceptional user experience. Content management is made easy through the integration of Sanity CMS, which supports effortless content creation and on-demand revalidation via effective webhook connections. For user authentication, Solid employs NextAuth, ensuring a secure login experience with options for password recovery and social media sign-ins. Overall, Solid is an ideal choice for developers seeking to expedite their SaaS project development while maintaining high standards of quality and performance.
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