A detailed comparison of ShortPixel and Imagify, two of the most popular image optimization plugins for WordPress.
EWWW is another quite popular plugin for image optimization. Check out how it compares with ShortPixel Image Optimizer.
Examining the performance and functionality of ShortPixel and TinyPNG: a detailed analysis.
A critical assessment of ShortPixel vs. Converter for Media: which WordPress image optimization plugin is the best fit for your website?
Smush PRO is the premium version of Smush, one of the oldest image optimization plugins. Here you can see how it compares to ShortPixel.