There is a common misconception that Method cannot work on a Mac. This is not exactly true. Method will not work if QuickBooks is on a Mac.
However, as long as it's QuickBooks Online or QuickBooks Desktop on a PC, Method itself can be used on any browser or our mobile app.
To reiterate, the restriction to using Method is dependent on where QuickBooks is installed.
QuickBooks Online: You can access Method on the browser both on Mac or a PC.
QuickBooks Desktop Installed on a PC: You can access Method on the browser both on Mac or a PC.
QuickBooks Desktop Installed on a Mac: If QuickBooks is installed on your Mac, you cannot install nor run the Method's Sync Engine for the bi-directional real-time sync. Thus, if you are using QuickBooks for Mac, you will not be able to use Method.
Furthermore, there are restrictions on which edition of QuickBooks we support. Please see our article Supported Editions of QuickBooks.