With Quip, everyone can edit the same version of the document at the same time — from any device. There's just one document and one chat thread, not a bunch of attachments with indecipherable titles like “ClientProposal-Kevin-Version3.doc.”
Chat is built into the Quip product experience. Every document has a chat thread, and you can even chat about specific parts of a document. You don't need to bounce back and forth to email to talk about what you're working on.
Every Quip feature works as well on your phone and tablet as it works on your desktop. Whether you're responding to a message or changing a complex spreadsheet, you don't need to be tethered to your desk to get your work done. Quip is available for iPhones, iPads, Android phones, and Android tablets.