Instagram engagement information

I'm looking for some kind of software / website to give me information on the engagement on my account. I know that ink 361 has stats, but I want more specific information. I want to know which followers are engaging more, and which ones are engaging less / not at all. Basically, I want to unfollow the people who aren't engaging with me. Does anyone know the best place I can find that information? I tried a mobile app that claimed to do that, but it wasn't reliable at all.

Thanks