Guardian vs OmniAuth: 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 OmniAuth? OmniAuth is a flexible authentication system utilizing Rack middleware. OmniAuth is a Ruby authentication framework aimed to abstract away the difficulties of working with various types of authentication providers. It is meant to be hooked up to just about any system, from social networks to enterprise systems to simple username and password authentication.
Guardian and OmniAuth belong to "User Management and Authentication" category of the tech stack.
Guardian and OmniAuth are both open source tools. OmniAuth with 6.88K GitHub stars and 877 forks on GitHub appears to be more popular than Guardian with 628 GitHub stars and 42 GitHub forks.