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LinkedIn Sign-In is an authentication system that allows users to sign in to third-party websites and apps using their LinkedIn account. It provides a streamlined login experience for users while giving developers access to professional profile data (with user consent). LinkedIn Sign-In offers features like profile syncing and access to professional networks, making it particularly useful for B2B applications and professional networking platforms. Its focus on professional identity and data makes it a valuable tool for businesses targeting professional audiences.

NextAuth.js is a complete open-source authentication solution designed specifically for Next.js applications. It provides a simple and customizable authentication system that supports various providers including social logins, databases, and custom credentials. NextAuth.js offers features like JWT sessions, database adapters, and built-in CSRF protection. Its seamless integration with Next.js and support for serverless environments make it a popular choice for developers building modern web applications with Next.js.

Auth0 is a flexible, drop-in solution to add authentication and authorization services to applications. It provides a universal authentication & authorization platform for web, mobile, and legacy applications. Auth0 offers features like social identity providers, multi-factor authentication, user management, and customizable login pages. Its extensive documentation, easy integration, and support for various identity protocols make it a popular choice for developers looking for a comprehensive identity management solution.

Apple Sign-in is an authentication system based on OAuth 2.0 and OpenID Connect, providing a privacy-friendly way for users to sign in to websites and apps. It offers features like "Hide My Email," which creates unique, random email addresses to forward to the user's personal email, enhancing privacy. Apple Sign-in is required for apps that exclusively use third-party sign-in options on Apple platforms. Its strong focus on user privacy and seamless integration with Apple devices make it an attractive option for businesses looking to offer secure and user-friendly authentication.

Google Sign-In is a secure authentication system that enables users to sign in to websites and apps using their Google account credentials. It reduces the burden of account creation and password management for users while providing developers with access to user profile information (with user consent). Google Sign-In offers features like one-tap sign-in, cross-platform integration, and OAuth 2.0 protocol support. Its integration with other Google services and strong security measures make it a popular choice for businesses seeking a reliable and user-friendly authentication solution.