I use an android smart phone. One of the most handy apps I have on it is my shopping list. I use MyShoppi, but there are a lot of different shopping list apps so find one that works best for you. Its so easy to add things as I think of them, and my list is always with me when I happen to stop by the grocery store. I also have the Joann app for the coupons (helpful hint here, Joanns will also scan the website coupons right off your phone (pull up the website in your phone browser and there is a link on the front page to their coupons) and these coupons are often different than the app coupons.) I have a quilt calculator app, but honestly, I mostly calculate using paper and pen before going shopping. I have a few game apps but hardly ever use them. Occasionally use facebook and google maps.