Kingoroot is one of the apk who have ability to root your any Android phone without using computer.
You can download it from Google Play Store and other Apk stores.
Before 2 months ago My friend suggest me this Kingoroot apk then I installed this Apk in my smartphone Mi 4i. I want to become my phone rooted by this method. But when I open this app and click on the try root icon. Its starts loading and after 15 minutes it’s suddeny stopped in 77% . I try again but its stopped again in 77% . I try it 7 times but I didnt get any positive result. So I got irritate I immediately uninstalled this apk. And used another way to root my phone successfully. So guys don’t use this apk if you have any MI phone because it’s never work in your MI phones. And guys if you want to root your phone so try the safest way to you root your phone that is root your smartphone with the help of computer.