We know you're often not in control of your users’ web browsers and they'll either upgrade to the latest automatically or be fixed on an old version by their local IT policies.
Kahootz supports all versions of Microsoft Internet Explorer from version 10 onwards, along with Edge, Chrome, Firefox, Opera & Safari.
It uses fully standards-compliant HTML so should work on other browsers too. Kahootz also works on tablets and smartphones (see Kahootz on Mobile).
In regards to hand-held devices, there is no specific app required to be installed on your device as you access Kahootz via an internet browser.
Because Kahootz is accessible & exceeds WAI level AA, it'll work with assistive technology ("AT") browsers and equipment for those with sight and motor problems too.
Troubleshooting tip - Please make sure you've got the most up-to-date version installed.