What are some alternatives?
When comparing Optimus.io and PNGGauntlet, you can also consider the following products
ImageOptim - Faster web pages and apps.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
JPEGmini - JPEGmini - The Photo Optimization Tool Trusted by Tens of Thousands Image Perfectionists
pngquant - command-line utility and library for lossy compression of PNG images
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
OptiPNG - OptiPNG is a command-line PNG optimizer that recompresses image files to a smaller size, without...