Caderno started out as a personal project. The main goal was to build a minimal note taking app. You could open and start writing immediately, with no distractions. Notes would be saved as plain text files. And you could share them with all other apps on your phone, without gimmicks.
A first version of Caderno was released in 2013. More than 32K users have installed it, and it has a 4 start rating on the Google Play Store.