The idea of the app is simple. Plug in your current numbers. Either plug in a goal and it will tell you what combination of exercise and calories will help you reach it, or plug in a planned lifestyle change and it will plot the results.
It looks like if I increase my activity slightly and keep my calories to 2,000 per day or less, I should make my DietBet. It also shows that a drastic calorie reduction would only make a pound or so difference over that short of a timeframe. Over the long run, the key seems to be consistency, though bigger changes will get bigger results. I have had a rough few days but I have planned workouts for next week and I should be able to wear my contact lenses again, which increases the range of possible activities. I could even swim alone without my contacts, I just wouldn't be comfortable going to a group practice blind.
If you want to freak yourself out, plug in a plan to increase your calories by 2000 or so per day. Yikes.