Guardian vs Userbin: What are the differences?
What is Guardian? Remove the OAuth dance with one request. Avoid dealing with OAuth logic in your code, and spend more time creating your product. Guardian reduces the OAuth footprint in your code to a single request. Built with modularity in mind, Guardian leverages plugins to handle OAuth flows, should you encounter a flow that Guardian doesn't handle, create a small flow plugin to do so and carry on. Guardian comes with 5 pre-made plugins that cover 99% of OAuth services.
What is Userbin? Instant User Accounts. Turns your link tags into sleek login flows. Add one line of code to your website to get a login interface that is consistent across all browsers. Start accepting signups and handle logins with no additional HTML or CSS.
Guardian and Userbin can be primarily classified as "User Management and Authentication" tools.
Guardian is an open source tool with 628 GitHub stars and 42 GitHub forks. Here's a link to Guardian's open source repository on GitHub.