Yep, on sale for a very short time. 40% off for the next 48 hours!
Dapp has never been on sale, so for anyone who has been holding off, now is the perfect time to pick up Dapp.
P.S. Technology is only a small part of your app success. There is the business, sales and marketing that you need to think of too :). Which is why I also provide a bunch of free education on how to succeed on the App Store - http://kerofrog.com :).