[Rikku Watro]

Many root apps make your warranty ineffective, so which are the root apps that don't make your warranty ineffective?

[Rukbat]

The apps don't, rooting the phone does. So if you can run any app that requires root, you've already voided the warranty.

[srkmagnus]

Many root apps make your warranty ineffective, so which are the root apps that don't make your warranty ineffective?

By rooting, you are risking looking warranty on the device depending on what happens to it if you need to send for service.