Definitely used this app for quite sometime. I did notice that it had required a number of permissions, so one day I decided to ditch it out of principle.
For those looking for an alternative, I've been using the Telsa light, and loving it. Highly recommend. The author even outlines the exact permissions that he's using, and why he's using them.
https://play.google.com/store/apps/details?id=com.teslacoils...