During the winter I gave out some promo codes for my iPhone tip calculator and bill splitter, CheckMate. Those who downloaded CheckMate really liked it. I recently updated CheckMate with a simplified numerical display and a few other small features. With that update I decided to make the app a free download (it was $0.99). I encourage everyone to check out the details at https://www.matthewqnielsen.com/checkmate.html and give CheckMate a try (why not? it's free!).