Google Play - Question

Hi guys, so I'm doing a small research and I am wondering:

Is there any way OR tool that could help me to estimate daily installs of the specific app in Google play?

Thanks!

What I was doing is:

On appannie, you could see when an app was launched. so you can count the days from when the app was launched to now, which gives you an estimate of daily installs.

Probably there should be some tool or tracking since from google play we know when 500+/1000+/5000+/10'000+/50'000+ etc then you get launch date, and then you can calculate an estimate of daily installs.

I use appfollow