I had a look at both Foundation and Bootstrap 2 weeks ago and decided to use Bootstrap (by the way, they're both not pure css). Mainly because I didn't like the styling of Foundation (compare forms, buttons, alerts etc.) and I found their naming conventions, well, awkward:
Foundation: <div class="row"> <div class="four columns">...</div> <div class="eight columns">...</div> </div> Bootstrap: <div class="row"> <div class="span4">...</div> <div class="span8">...</div> </div> Foundation: <div class="row"> <div class="four columns">...</div> <div class="four columns offset-by-four">...</div> </div> Bootstrap: <div class="row"> <div class="span4">...</div> <div class="span4 offset4">...</div> </div> Besides, these two features are quite helpful: http://addyosmani.github.com/jquery-ui-bootstrap/ http://twitter.github.com/bootstrap/less.html Kind regards, Annet.