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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NextUpKit
NextUpKit is a cost-effective, comprehensive Next.js SaaS starter kit aimed at empowering developers and entrepreneurs to efficiently create and launch their SaaS offerings.
Key Features
- Authentication: Ensure secure user access with NextAuth, which includes support for Google, Facebook, and magic link logins for a streamlined experience.
- Payments: Facilitate smooth transactions with a secure integration of LemonSqueezy, eliminating the usual payment hassles.
- Beautiful Design: Experience a visually appealing, responsive user interface crafted with shadcn UI and Tailwind CSS, ensuring optimized performance across a variety of devices.
- Database: Effortlessly manage and expand your data capabilities through seamless MongoDB integration.
- Email Made Easy: Simplify the management of transactional emails by utilizing Resend integration for smooth communication.
- Dark and Light Mode: Enhance user experience with built-in options for theme switching between dark and light modes.
- Analytics: Gain insights into user engagement and performance with the inclusion of Google Analytics and Microsoft Clarity integrations.
- Support: Provide immediate customer assistance through Crisp’s live chat integration, ensuring users receive help when they need it.
- Scalability: NextUpKit is designed to grow alongside your business, allowing for easy adjustments and enhancements as your project evolves.
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Indie Kit
Indie Kit serves as a powerful boilerplate for NextJS 15, designed to streamline the development of SaaS, AI, or B2B applications, allowing you to launch them in a matter of days rather than months. This versatile framework features seamless authentication, integrated payment solutions, and comprehensive plan management capabilities. It effectively handles quotas, billing, multi-tenancy, and feature rendering based on organizational needs, while also ensuring user-specific API routes for enhanced security. Email services are managed through SES, accompanied by a React Email Designer, and automated workflows and notifications are facilitated by support for Background and Scheduled Jobs. An extensive super-admin interface offers dashboards for monitoring users and plans, managing waitlists, handling contact forms, and displaying real-time analytics. Crafted entirely with shadcn/ui and Tailwind CSS, Indie Kit also incorporates pre-set MDX blogging, SEO enhancements using JSON-LD, integration with S3 for file storage, webhook configurations, audit trails, and managed serverless hosting, making it a comprehensive solution for rapid development needs. With its robust features, Indie Kit empowers developers to focus on building their applications while minimizing the time spent on foundational setup.
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