How to unfollow Instagram followers that aren't following me back?

[johnbrent609]

Looking for tools or apps to Instagram and that allow me use to unfollow people that weren't following me back, are now no longer working.
Within the Instagram its self it is possible to see a list of who I'm following, but it does not show whether these people are following me back or not.
What's now the best way to unfollow accounts that are not following me back?

 

[Katy Clouds]

I am using Crowdfire for this, the limits are a little confusing though.