When comparing Download Shuttle vs Leech, the Slant community recommends Leech for most people. In the question“What is the best download manager for Mac OSX?” Leech is ranked 9th while Download Shuttle is ranked 10th. The most important reason people chose Leech is:
Must be in *.txt format/extension.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free
Pro Automatic clipboard capture
Pro Multiple part downloads
Ability to split a file into several segments and download them individually to increase the download speed.
Pro Resumable downloads
Pro Schedule downloads
Pro Can download from a Plain Text file
Must be in *.txt format/extension.
Pro Unobtrusive
Option to download in the Leech download client in the background without losing focus on your browser and to automatically quit Leech when all downloads complete.
Cons
Con It's little known; might be abandoned sooner or later
Its Chrome extension got abandoned in 2014 even though it's still in Chrome Webstore and people are complaining it doesn't work.
Con Not free
Con Doesn't work with Google Chrome
Leech only works with Safari and Firefox (possibly similar browsers) with the FlashGot addon properly configured. Some other download managers have extensions that work with all the popular web browsers. Leech only has one extension for Safari.