Visio Online is available to all paying customers on Business, Enterprise or Government Office 365 subscriptions. However, you must have an Office 365 subscription in order to use it. Microsoft Visio Online (also known as Visio For The Web) is a more basic version of Visio Professional but can be used to open Visio files on a Mac. Here then are 5 easy ways to open Microsoft Visio files on a Mac. There’s also more likelihood of compatibility or technical issues with future releases of macOS. The disadvantage is that you usually have to pay for major upgrades in the future. The advantage of these is that all data stays on your desktop and isn’t uploaded anywhere. Desktop Viewers: These include apps such as OmniGraffle and Nektony VSDX Annotator which are desktop applications and require no internet connection to use.Although these services guarantee confidentiality, you should be aware of this fact if you’re dealing with sensitive corporate Visio files or diagrams. However, it’s important to be aware that they upload Visio files to their own servers in order to display them in your browser. Online Viewers: These include apps such Microsoft Visio Online and Lucidchart and which work instantly in your browser and are therefore compatible with any version of macOS.There are two types of apps for opening Visio files: Visio Viewers For Mac: Online vs Offline.