FusionAuth
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
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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StarterKitPro
StarterKitPro is a powerful Next.js SaaS boilerplate that offers developers a streamlined foundation for building and launching applications quickly. It comes packed with essential features including built-in authentication, payment integrations with Stripe and Lemon Squeezy, email workflows, dashboards, landing pages, and SEO enhancements. The boilerplate also includes a fully functional blog and documentation setup, along with a rich library of over 50 customizable UI components to speed up frontend development. Social login support makes user onboarding effortless. Developers can build unlimited projects for personal use or client work, eliminating the need to repeatedly configure common SaaS functionalities. Designed for solopreneurs, indie hackers, and teams alike, StarterKitPro enables faster shipping and easier scalability. Its robust architecture ensures that developers can focus on building unique features rather than reinventing the wheel. Ultimately, StarterKitPro accelerates the SaaS development process, helping you get to market with confidence.
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ShipAppsFast
ShipAppsFast is an all-encompassing Next.js SaaS boilerplate created to accelerate product launches by incorporating essential features from the start. It provides strong authentication capabilities, featuring options like magic links and social logins, along with complete flows for user registration and password management. The platform simplifies billing and subscription oversight through its integration with Stripe, which effectively handles payments, billing portals, and pricing tables while ensuring automatic database updates via Stripe webhooks. Transactional emails are efficiently managed through Resend, allowing users to customize templates directly using React. The boilerplate is equipped with a diverse range of UI components that are optimized for mobile devices, including elements for landing pages and authentication, all developed with Mantine UI. Additionally, a pre-configured blog system allows for streamlined content management using Markdown files, and it supports multiple languages through the integration of JSON files for translations. This robust technology stack includes Next.js and NextAuth for authentication, among other advanced features, ensuring that developers can quickly and effectively build their applications. Overall, ShipAppsFast stands out as a powerful solution for those looking to launch their SaaS products with minimal delays.
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