“one of the highest ROI projects we ever did at Code Academy is we rewrote all of the checkout error copy...it literally took like two days...maybe that very conservatively lifted checkout page conversion like 1% but 100% of your new revenue goes through the checkout page so it's really like you lift the whole business's revenue 1%”

Rewriting Checkout Error Messages Lifted All Revenue 1% — A Two-Day Project

Dan's highest-ROI project at Codeacademy wasn't a new feature — it was rewriting payment error messages to actually explain the problem and tell users what to do next. Took two days. Because 100% of revenue flows through the checkout page, even a 1% lift propagates to the entire business. For subscription apps using web checkout especially, this is a high-leverage area that is routinely neglected in favor of flashier product work.