As its name suggests, Grid is built around a satisfyingly simple grid-based UI design that brings order to potentially chaotic information. The app's primary purpose is to organise all the different component parts of your projects - notes, pictures, people and places - in a personalised, easy-to-understand way.
Grid has a bespoke user interface called Maestro, which uses a selection of gestures to create a grid structure for any given task, and organise it as you see fit. It's also fully collaborative, so users can share joint plans and contact each other from within the app. It'll be available on the App Store soon - you can sign up for updates, and watch a demonstration video, on the website.