Pricing varies by plan
“We're going to be using the Blackmagic camera app because I want to try to match the camera settings.”
“I tried the Blackmagic camera app to see what I could do for video. I can shoot open gate. Got 4K went to 120 in this.”
9 more creators cited with it, listed below.
Creators who use this also use

Blackmagic Camera App for iPhone
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CleanShot X
also used by 2 of them

DJI Mimo app
also used by 1 of them

Final Cut Camera
also used by 1 of them

iPhone Camera app
also used by 1 of them
iPhone standard Camera app
also used by 1 of them