With QT you can record iPhone/iPad screen right out of your device http://www.tekrevue.com/tip/record-iphone-screen-quicktime/
Hi there, which kind of device you use? Android? iPhone? or computer? I believe that there is a simple built-in screen recorder on any smart phone now. But if you are looking for a tool to take game videos on a computer, I'd recommend Joyoshare screen recorder to you. I often use it to record WOW and it is available for Windows and Mac. It can record gameplay in HD quality with no lag, which is quite important I think. You can set 60 fps as well. By the way, my friend also told me that there is a built-in screen recorder in Windows 10, too. You can open it by pressing Win+G. You could also give it a try if you need. For more joyoshare product info, maybe you could visit: https://www.joyoshare.com/screen-recorder-for-win/