finally Google Phone app for marshmallow. this thing is awesome.

The URL to the APK -- not on Google Play -- suggests this is still only a release candidate.
 
That link is a good one.
It contains Google Store links for both Phone and Contacts.

Based on user comments, the both apps seems to have some major bugs in them. :-(
 
So far, no bugs in the phone app. The contacts app isn't compatible with my phone.
 
Oh I liked the dialer on my nexus 5. Is that what we're talking about? The ID features were sweet.
 
I'm still trying to figure out the app, myself. I know that I like the fullscreen photo of contacts and the favorites dialer screen. I haven't seen a video calling choice o button yet on calls, but I wonder if it's because no one who has called me yet has a phone that's compatible with that feature or if it's because it just isn't there, which is unlike the stock phone app with my T-Mobile LG G4... I might try to research and find a comprehensive list of features that are supposed to come with this app..