WriteMapper works on macOS and Windows.
Do note that on a Mac, it requires macOS 10.9 Mavericks or later in order to run. On Windows, it requires Windows 7 and later; older operating systems are not supported (and do not work).
On the iPad, iOS 9 and above is required for WriteMapper to install and run, with iOS 11 highly recommended to take full advantage of the features integrated into the WriteMapper app.
Please refer to this article for more information on future availability on other platforms and operating systems.