When comparing Compressor.io vs ImageOptim, the Slant community recommends ImageOptim for most people. In the question“What are the best ways to improve web page speed?” ImageOptim is ranked 1st while Compressor.io is ranked 2nd. The most important reason people chose ImageOptim is:
Great for compressing images for web usage or saving harddrive space.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Two types of compression
Lossless and lossy: lossless for zero quality loss with a slightly reduced file size, and lossy for some quality loss for a smaller file size.
Pro 4 File Format Supported
JPEG, PNG, GIF and SVG.
Pro Losslessly compresses PNG, GIF, and JPEG images
Great for compressing images for web usage or saving harddrive space.
Pro Fast & Simple
Pro Simple drag'n' drop interface
Simply drag images (or folders) into the window.
Pro Tries several different image optimizers before picking the best one
Pro Edits files in place
It does edit files in place, overwriting the original. This is exactly what I want, so I love it, but it's good to know beforehand.
Pro Can handle PNG, GIF, and JPEG images
Great for compressing images for web usage or saving harddrive space.
Cons
Con Max file size is 10 MB
Con Can't compress more than 10 images
Con Compression algorithm not as good as counterparts
Con Cannot abort an optimization
Optimization can run for a long time. Sometimes it reaches 20% quickly and then spend a long time to attain 21.2%. But you cannot interrupt the process.