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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Shipped
Shipped serves as a Next.js SaaS boilerplate that accelerates startup launches by offering customizable pages, including options for landing, waitlist, pre-sale, pricing, and affiliate programs. It seamlessly connects with Lemon Squeezy for payment processing, allowing users to quickly establish subscriptions and one-time purchases while sidestepping the challenges of international tax compliance. User authentication is managed through NextAuth and Supabase, offering features like magic links and support for social logins via platforms such as Google, Apple, and Facebook. The platform also provides email capabilities compatible with services like Mailchimp and Loops, facilitating both transactional emails and newsletters. Developers can select from various databases including MySQL, PostgreSQL, and MongoDB, and they can utilize Prisma for straightforward data management. Shipped features a collection of React components crafted with Chakra UI, Tailwind CSS, and shadcn/ui, ensuring a sleek and contemporary design that can be tailored to fit any brand's identity. Moreover, its extensive documentation and community support make it easier for developers to implement and customize their applications effectively.
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VibeReady
VibeReady serves as a comprehensive AI-focused SaaS starter kit tailored for developers leveraging AI coding tools such as Claude Code, Cursor, Windsurf, and GitHub Copilot.
In contrast to conventional boilerplates that falter when AI generates large amounts of code, VibeReady incorporates an integrated AI framework that ensures your codebase remains coherent and well-organized as it expands. Each feature is documented in a manner that is compatible with LLMs, providing the necessary context to AI tools, thereby preventing issues like hallucinations, pattern drift, and the buildup of technical debt.
The complete package also comes equipped with production-ready SaaS functionalities right from the start, including user authentication (via Clerk), payment processing (Stripe), multi-tenancy support, role-based access control (RBAC), an admin dashboard, an AI assistant capable of tool invocation, email services (Resend), background job processing (Inngest), infrastructure as code (Terraform for GCP), and continuous integration and deployment (CI/CD) through GitHub Actions.
This offering is designed specifically for technical entrepreneurs, indie developers, and teams focused on launching SaaS solutions that harness the power of AI-driven development tools. Additionally, VibeReady fosters a seamless development experience, enabling users to concentrate on innovation without the burden of managing complex integrations.
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