Initially the app had only single button, which would root your device on click. Now there are two options: temporary root and permanent root. The new temporary root option works on 99% of available Android devices - no list yet of which specific devices are incompatible with the temporary root option.
Disclaimer: Neither we, nor developer should be held responsible for any damage happened to your device in the process of following the instructions mentioned in this article. It’s very unlikely that there will be any issues but just in case if at all there are any issues then we are committed to help you in solving the same.