I'm using Android 6.0 (non-rooted) phone and looking for an application called call tools optinno.

Though it can be easily found by searching on net : https://play.google.com/store/apps/details?id=com.calltoolsoptinno , However, I can't find on play store by searching call tools optinno or by call blocker etc.

I've also tried by entering id : com.calltoolsoptinno on the play store but didn't get.

Note: I've scrolled down multiple times but can't find the app I'm looking for.

What's wrong with searching mechanism?