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What did you write it in, out of curiosity? Obj-C and Carbon?

I wrote it in Swift 5.1 and used Carbon APIs for some features.

How's the Carbon work, considering your app is 64-bit?

Parts of Carbon are still around. It’s only the GUI parts that never made the transition to 64-bit.

(Source: my app uses a couple Carbon APIs, where I couldn’t get the newer Cocoa APIs to work reliably.)