They are similar and use some of the same underlying technology powered by the readability library, but newswaffle gives more options on how to render the article (article mode, link mode, raw mode), it isolates images and gives them their own external url link you can click on, it tells you exactly how much cruft it saved from original webpage (something about seeing 99.x% lighter makes my brain tingle good chemicals). It works well with article indexes. Hope these examples help.