Apolo in the terminal.

Install

On macOS and Linux, with Homebrew, which also brings the server for AI agents. Otherwise, download your system's archive from the downloads, under “Other downloads”.

$ brew install webcafeina/apolo/apolo

The usual options

Each format takes the options of its official tool, and gives the same file, byte for byte:

WebP, like cwebp

$ apolo webp -q 80 photo.png -o photo.webp

AVIF, like avifenc

$ apolo avif -q 60 photo.png photo.avif

JPEG XL, like cjxl

$ apolo jxl photo.png photo.jxl -d 1

JPEG, like cjpeg (MozJPEG)

$ apolo jpeg -quality 80 -outfile photo.jpg photo.png

PNG, like oxipng

$ apolo png -o 4 photo.png

Whole folders

apolo lote converts folders and images in parallel, with their subfolders, and never overwrites: if a file exists, the new one gets a number.

WebP and AVIF, at the lowest quality that doesn't show

$ apolo lote photos/ --formato webp,avif --objetivo 80

At 1920 px on the longest side, only the lightest format per photo

$ apolo lote photos/ --formato webp,avif,jpeg --mas-ligero --lado-mayor 1920

With a preset saved in the app

$ apolo lote photos/ --preset "For the web"

Measure the loss

SSIMULACRA 2, PSNR and SSIM of a result against its original. At 90 or more you can't tell them apart; at 70, it's high quality; at 50, it shows.

$ apolo medir photo.png photo.webp

In Spanish

By default, in your system's language. To change it, --idioma es (or en).