Quip is a simple text editing service, which lets students cooperate on documents regardless of the devices they are using. Quip is primarily suited for use within the polyphonic form of teaching.
Within the polyphonic form of teaching Quip can be used as students' common writing tool. It is possible for several students to work simultaneously in a shared document, and it is possible to see who has written what. There is not as great opportunities to format text as in Google Docs, but you can create to-do lists and insert images and videos in the shared documents.
It is possible to chat in Quip, just as it is very easy to invite others to join in the work of a document or a folder with several documents. The documents and folders you have created are displayed in a very uncluttered visual layout.
Quip can be used with a computer, as it is possible to download it as app for iOS and Android. This provides excellent opportunities for all students to participate, regardless of the device they are using. It's free to use Quip, and you can either sign up with an email address linked to a Google Account, or you can create an account for Quip here.