I just realised I’ve been using Kaleidoscope for maybe 10 (?) years now.
I certainly didn’t pay $150 for it at the time, but if I had done, it would’ve been worth every penny.
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I seem to recall the app was acquired by a new development team a couple of years ago. It seems to have been one of those rare acquisitions where it’s consistently gotten better afterwards (and it was great to begin with).
It still gives me sticker shock, though.