Plotto is entirely browser based, you do not need to download anything or run any other programmes for it to work.
As the Plotto user you are best to use Plotto on a desktop computer or tablet. It works on Windows and OS X and all modern browsers.
Your research contributors can record their responses on desktop, tablet or smartphone. Again it works on all modern browsers except Safari and IE11.
You will need your device to be fitted with a webcam and microphone to record videos.
WARNING: Some companies have network restrictions on what links and tools their employees can access on work computers, so if you are planning on engaging an office based audience it may help to check this first.