A while back we wrote about the idea of headless apps
: an app that integrates existing UIs and has no real UI of its own. For example, suppose you write your weekly newsletter in a Trello
card, set a due date, and an app running in the background sends the email at the due date.
Headless apps have a couple big advantages. First, given that Trello already has a mobile app, you don’t need to worry about building a mobile app or browser app. Second, if your users already know how to use Trello, they need a minimum of training in how to use your app. Finally, you don’t need to worry about building access control into your app. Trello gives you that for free.