Crunch is a free, open source macOS GUI application that is built on pngquant and zopflipng PNG image optimization. It uses a lossy approach to PNG image optimization. The tool is available through Homebrew as a native macOS application.

`$ brew cask install crunch`

Image examples + compression ratio analysis available on the Github repository README.

MIT license.

Crunch is a free, open source application for PNG image optimization.

The v2.0 release includes:

- New command line executable support for use on any *nix machine

- Parallel image processing support

Thanks to the Product Hunters who made recommendations in the v1.0 announcement threads that led to these improvements!

MIT License