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Telegram ? https://raw.githubusercontent.com/telegramdesktop/tdesktop/d...

Battle.Net ? https://i.imgur.com/VCNEhgm.jpg

both are made with Qt

I didn't know Telegram uses Qt. No desktop messaging client has better UI/X.

Really? I joined a few groups but couldn't figure out how to post, and there was an emoji drawer eating up 1/3 of the screen, and was unable to be hidden. I consider myself a smart enough person to write an app that performs the role of Telegram, I shouldn't have trouble learning to use it.

See e.g. for a list of applications https://en.wikipedia.org/wiki/Qt_(software)#Qt_market

Of course it depends on where your interests lie but here's some examples: VLC, Spotify (Linux), old Opera, Krita, Google Earth, Tesla Model S in-car UI, webOS, SailfishOS, AMD's Radeon Software Crimson driver tool, and many others including what's already mentioned, Battle.net.

Any Qt app can be themed with CSS (Qt calls it QSS) as if it was an HTML page, just like Electron apps can be. You can completely change the design, if you wish to.

So, in terms of design, there’s basically no major difference there.