Math is not my strong suit; I always travel with a calculator and a tip card to help me scoot by. I know I'm not alone thanks to CheckPlease. With this app, math-challenged diners can easily split a tab among multiple people and figure out the tip in just a few seconds. The app even calculates the tip on the total before tax. There are two versions of CheckPlease: a free one that features ads or an ad-free version that costs $0.99. It's available for download to iPhones and iPod Touch here. What's your favorite app? Let us know in the comments below. These sites are not affiliated with AFCEA or SIGNAL Magazine, and we are not responsible for the content or quality of the products offered. When visiting new Web sites, please use proper Internet security procedures.