IV calculator for android. Which to chose.

I'm setting up my son's new cell phone; a Huawei P10 light. This uses an android operating system. I wanted to download Poke Genie, but that's not offered in the Play Store. I like Poke Genie because it calculates based on a screen shot and doesn't fiddle with PoGo directly. Can anyone recommend an IV calculator app that's safe to use?