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Some? More like all AAA applications use ~100% ObjC. I'm talking about apps like Facebook, Messenger, Instagram, YouTube, etc.

Those use mostly C++ alongside Objective-C, or nowadays Swift, unfortuly what most use is something like React Native, Flutter,....

I'm pretty sure that Adobe Photoshop is still C++.

Funny story. It started off as Object Pascal, and used MacApp 0.9 as its framework.

I think the codebase was converted to C++, around Photoshop 3.

Snapseed[0, 1] (won awards) had its engine written in C++.

C++ is a good language for image pipelines. Doesn't really pass the "ooh, shiny!" test, though...

Yes, the initial Photoshop version source code has been made available.

This is likely true. I only know of a couple, but I'm quite sure that there are legacy codebases up the yin-yang.

Either that, or Electron/Xamarin/React Native.

I am not really a fan of the hybrid apps. I was just watching Slack go crazy on my iPad, a few minutes ago.