Electrodroid/Electrodoc is compatible with Android 1.6 and successive. It supports phones and tablets with all the screen densities and resolutions. Some feature may be available only on recent versions.
Electrodroid/Electrodoc is also available for Blackberry (BB10 and Playbook), Windows Phone (7.x, 8.x, 10) and iOS devices (8.0 or later).
For other apps compatibility please check their respective page.