If you have apps which support x-callback-url, consider submitting a pull request with examples of the actions supported by your app!
Version 2.14 of the OmniGroup’s venerable task manager OmniFocus adds support for powerful x-callback-url features. For details, read the topic on the OmniGroup’s discourse site.
Great to have Ulysses, the powerful writing app from The Soulmen, add x-callback-url support! Check out their documentation for details.
Workflow is a very cool new app that pushes the boundaries of automation on iOS. And, of course, has x-callback-url support!
Lots of great new things happening with Tumblr for iOS lately. Including the addition of some great x-callback-url support!.
Inter-App Communication, IAC from now on, is a framework that allows your iOS app to communicate, very easily, with other iOS apps installed in the device that supports the x-callback-url protocol. With IAC you can also add an x-callback-url API to your app in a very easy and intuitive way.
Looks very cool. Been thinking about implementing x-callback-url, but haven’t? You might want to check out this library.