LASR Classic requires Windows 7 or newer, and a computer-grade processor is recommended (such as an i3 or better). Like any computer software, the better the machine, the better it can run.
You can also run LASR Classic on a Mac using bootcamp.
LASR X can run on nearly any device, but performance may vary with older/slower devices. Ipads and other high-end tablets do well, as do almost all computers, some higher end phones do well. Lower quality or older/slower devices may have some lag or latency in shot detection, but generally can still run the app.