Micro subject line statistical significance calculator — A/B tests. Made with Aaron Swartz. Hidden cats.

I really like this - it's simple and really easy to use without having to do any formulae. Great stuff, thanks for sharing :)

Thanks! Aaron Swartz and I made it in an afternoon a few years ago as a fast way to teach colleagues how to do simple significance tests. Because it explains everything right on the page in simple language, it's still the best tool for the job that I know of.