Mac and Windows, currently.
On Mac, we support: OS X 10.8+, 10.9+, 10.10+, and 10.11+.
On Windows, we support: Windows 7, 8, 8.1, and 10.
Screenhero is cross-platform compatible, which means you can share between Mac and Windows (and any other future platforms).
Want support for other platforms or OS versions? Let us know.