Litmus

Litmus shows you exactly how your designs look on every platform, across every popular web browser. (And the not-so-popular ones.) Email testing ensures your messages are delivered perfectly. Painlessly test your emails on all major email clients and spam filters

Once you've finished testing, one click publishes a full compatibility report ready for review by your client or boss. It's pretty neat.

An advanced testing tool for web professionals. Litmus makes compatibility testing easier.

Litmus is lightning-fast, reliable and affordable. It's relied upon by thousands of smart freelancers and switched-on agencies; as well as big companies like Yahoo!, Facebook and eBay.