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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TANSHIP Template
TANSHIP Template is a production-oriented SaaS starter kit built with TanStack Start and optimized for deployment on Cloudflare Workers. It gives independent developers and small engineering teams a preconfigured foundation for launching SaaS products without rebuilding common infrastructure for every project. Authentication is handled through Better Auth with email and password login, Google OAuth, email verification, password recovery, session management, and security controls. Payment integrations support Stripe, PayPal, and Creem through a shared provider architecture covering subscriptions, one-time purchases, webhooks, and billing workflows. The data layer uses Drizzle ORM with Cloudflare D1, while Cloudflare R2 supports user-uploaded files and Resend handles transactional email. TANSHIP also includes AI functionality with Workers AI, credit metering, usage limits, and multiple ready-made modules for tasks such as summarization, translation, text-to-speech, image analysis, and content generation. Developers can customize the interface with 34 theme presets, a visual theme editor, responsive layouts, and bilingual English and Chinese routing. The delivered source includes 36 bilingual guides, a changelog, dashboard views, migrations, deployment tooling, and hundreds of automated checks. TANSHIP is designed to shorten SaaS development time by providing the technical foundation needed to move from an idea to a Cloudflare-hosted product more efficiently.
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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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