ShortPixel is described as 'image optimization API and WordPress plugin that helps improve your website performance. Both lossy and lossless compression available' and is an app in the Photos & Graphics category. There are more than 25 alternatives to ShortPixel for a variety of platforms, including Online / Web-based, Mac, Windows, Wordpress and Linux. The best alternative is RIOT - Radical Image Optimization Tool, which is free. Other great apps like ShortPixel are ImageOptim (Free Personal, Open Source), TinyPNG (Freemium), JPEGmini (Paid) and Optimage (Freemium).
Mini-Compressor is an easy to use image compression tool. Compress images by right clicking on the images or folder of images. A viable alternative to other photo editing software if all you need to do is quickly compress a image.