The app I have been using for over a month? myfitnesspal.com. Recommended by Sparrow bariatric clinic. It is FREE. It works. Five weeks I lost another 9 pounds. Seems when you realize where the calories are going, and make a point of eating at least 15 g of protein for each meal, you do well. To start, the clinic recommends setting your calories at 1500 per day. Drink 60-80 ounces of water a day. I see someone earlier talked about a premium version, I have no idea what he is talking about …IT IS FREE. It is simple to use (the food portion, haven’t started using the exercise portion).