I used to work with neutrino api in my previous organization. It was very easy for our team to integrate their product with other third party products using neutrino api.The support they provide is also great, if you face any problem while integrating your application or system you can easily contact them. There are some features which were not supported by neuterino at that time so it would be helpful if they do this now! But overall its good service provider as i use it from past one year. Integration between two different applications was done smoothly through this plugin without affecting the performance of both the applications in any way. It's easy to use, it has all features I need for my project. No bugs in this library at all! It works perfectly for me as well. The only thing that is missing - no support for Swift 5 yet (I'm using version 4). Please consider adding support for Swift5. Also there are not so many documentation available online. Try to check out some tutorials first. We're solving user authentication by providing our clients with an ability to login securely without storing any sensitive data locally or remotely.