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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Ship SaaS
Ship SaaS is a robust boilerplate built on Next.js, crafted to accelerate the creation of SaaS applications by offering vital integrations immediately upon setup. It includes a comprehensive authentication system utilizing Supabase Auth, which covers user registration, login procedures, password resets, and social media logins through platforms such as Google, Facebook, Twitter, and GitHub. The solution comes with a reliable and scalable PostgreSQL database, accompanied by a rapid SQL setup script for ease of use. Subscription billing and management are efficiently handled through Stripe integration, which also features webhook support for data consistency. Moreover, it offers file storage with adjustable security settings, transactional email functionalities via providers like Sendgrid, Mailgun, Postmark, and Resend, along with a markdown-enabled blogging system for easy content management. The boilerplate is designed to be mobile-friendly, incorporates internationalization through JSON file translations, and is optimized for search engines by utilizing Next.js's static page generation features. Additionally, developers can leverage the extensive documentation provided to maximize the utility of the platform.
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SaaSBold
SaaSBold is a comprehensive, production-ready boilerplate and starter kit for Next.js, designed to significantly improve both front-end and back-end performance while ensuring an excellent experience for developers. It encompasses vital functionalities including user authentication facilitated by Auth.js, accommodating social logins and magic links, as well as payment processing capabilities through Stripe, with plans to add support for Paddle and LemonSqueezy in the future. The application leverages PostgreSQL managed by Prisma for effective database management and incorporates transactional email services through Resend. Developers are provided with ready-made admin and user dashboards, a library of customizable UI components styled with Tailwind CSS, and a Figma design resource for effortless design integration. Additionally, SaaSBold includes marketing tools such as integration with MailChimp for newsletters, AI functionalities powered by OpenAI, and support for internationalization to cater to multi-language applications. Deployment is made hassle-free with a one-click solution using Vercel, allowing teams to focus more on development and less on setup processes. With these features, SaaSBold stands out as a robust choice for building scalable SaaS applications.
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