This product has an online, desktop and mobile one, only one account can log in to all devices, and if you choose to upload your PDFs to the cloud, it can sync on all devices. It is possible to collaborate with your teams, make real-time edits, sign business contracts, and annotate documents on any device. It provides you with the easiest way to edit text/images, read and manage PDF, take notes, highlight paragraphs so that you can greatly improve office or study productivity.