4k streaming on 3rd party app on DIRECTV stream

DirecTV Stream does not offer 4K programming. Using apps, you may be able to stream 4K. Of course that depends on your device, the app being used, and the content.

Can you confirm if you can use the 3rd party apps on the stream box of the3rd party app is enabled for 4k content?

You can use 3rd party apps, but the 4K is only upscaled to 4K. Not true 4K. The box has its own PlayStore version of Google.

You have to check with the service you are using --in terms of 4k content. (Netflix, etc. ) I've watched 4k content on my Dtv Stream box. I have the Parmount plus/Showtime bundle and watched Your Honor in 4k.

The simple answer is yes. 

The Stream device hardware supports 4k, so if the third-party app supports 4k (and the content of interest is 4k), it will be output in 4k.

there is now one 4k directv channel on fire cube 2 and fire cube 3 using the directv stream app on there channel 104 directv 4k.was added today july 20th

directv stream just added directv 4k channel 104 to there directv stream app on fire cube2 and fire cube 3 today july 20th . now all we need now is there two directv 4k live channels which shows live sports in 4k . they also said those channels will be coming soon . i think by september in time for college football 4k games .