What are some alternatives?
When comparing Optimus.io and ImageOptim, you can also consider the following products
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).
JPEGmini - JPEGmini - The Photo Optimization Tool Trusted by Tens of Thousands Image Perfectionists
CodeKit - CodeKit allows you to optimize the performance of your website by automatically and efficiently compiling a variety of popular languages.
pngquant - command-line utility and library for lossy compression of PNG images
OptiPNG - OptiPNG is a command-line PNG optimizer that recompresses image files to a smaller size, without...