Question: I'm looking for a solution that can simplify user authentication and provide a seamless login experience across multiple apps.

If you're looking for a way to streamline user authentication and offer a unified login experience across multiple applications, LoginRadius could be the way to go. It's an all-in-one user identity management platform that includes features like streamlined authentication, single sign-on (SSO) and support for advanced login options like social login, phone login and passwordless login. The platform is designed to be scalable and flexible, with deployment options to suit different needs.

Another option is Auth0, a powerful authentication and authorization service that grants users access to your application with a range of features including Universal Login, SSO, multifactor authentication and customizable actions. Its broad support for many languages and frameworks through more than 30 SDKs and Quickstarts means it's a good choice for managing customer identities in many different businesses. It also offers a free tier so you can try it out and assess the service.

If you need a full-stack user management solution, Clerk offers a variety of authentication options including multifactor authentication, advanced security and social sign-on. It also supports multi-tenancy with customizable roles and permissions, which means it's good for applications that need flexible user management. The service offers a free plan for up to 10,000 monthly active users, with more features available through Pro and Enterprise plans.

Last, if you're interested in a passwordless authentication service, MojoAuth is an option. It offers a better user experience with faster and easier login, and it shrinks the attack surface for hackers. Features like universal compatibility, white label login forms and easy API integration mean MojoAuth is good for a range of industries, including ecommerce and healthcare apps.