I have released a PHP-based A/B testing app called phpA/B that's free for personal use, but I'd like to do a paid commercial license.<p>What do you think would be appropriate pricing/licensing options?<p>See the app at http://phpabtest.com
Perhaps you should A/B test a few different price points.<p>On a serious note, are you thinking a one-time unlimited use fee or a recurring monthly or yearly rate? Also, I noticed on the "Begin Testing" page that you require Google Analytics for it to work. Have you considered using the Analytics API so the user doesn't have to deal with a separate interface to set it up?