Smol is a native Mac compressor with a neural mode for images, and everything runs on the machine with no account or upload. Its public benchmark of 24 Kodak images, tuned to the same SSIMULACRA2 score, puts its AVIF files 15 to 21 percent smaller than Apple’s; the page also admits sips is over ten times faster and Smol has no lossless mode. $29 once.