Bluebeam Studio® :

Collaborate in the cloud with anyone, anywhere, using Bluebeam Studio. Create or join an existing Studio Project from your Mac and start uploading PDFs for easy, streamlined file sharing. Access existing Studio Sessions or start a new Session on the go. Upload PDFs to a Session and invite attendees from around the world to view, chat and markup the same PDFs together in real time or on your own time. You can even upload Project PDFs into a Session and check in changes as you collaborate for real-time updates to Project files. All Session activity is tracked in a Record that links back to the PDF to easily review past Session activity.