It's a Kanban board to store TODO, DOING, DONE and BACKLOG tasks.
Bootstrap cards are used to display the content as a responsive board and JQuery helps for all animations.
Clear DB MySQLi database management system helps you in this process. You just have to do some clicks and inputs.
You can Register and login to retrieve your tasks your password is stored encrypted.
This app uses the PHP Heroku starter which is described as above : "A barebones PHP app that makes use of the Silex web framework, which can easily be deployed to Heroku." This application supports the Getting Started with PHP on Heroku article - check it out.
For more information about using PHP on Heroku, see these Dev Center articles: