Did you compare to PNG crush and optipng? Those are what I used to use because they’re easily installable Linux/brew packages.

Source:
over 1 year ago

My god running pngcrush on the 2x and 3x files takes ages. I run the thing overnight because it takes hours.

Source:
about 2 years ago

I’ve always just used this (it’s more old school but def solid): https://pmt.sourceforge.io/pngcrush/.

– Source: Hacker News
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over 3 years ago