I just tried it out and it's pretty sensible. Very user-friendly interface.
The desktop version costs hundreds of pounds! Only the most expensive option checks a really useful number of pages.
Thanks, Qualidator looks like a good tool and I'll certainly try it out. I looked at the about.com site and it is hopelessly out of date.
That is a pretty sweet tool Qualidator, it gives some fairly credible feedback too. I hope this isn't a completely obvious question, but what about Mozilla? And, I am with Bear88881 the about.com site makes me feel like I am in 1996, but it could just be me, ha.