It not only helps in counting calories it also gives daily articles and a set of TO-DOs. I was 275 lbs around 2.5 months ago but since then have lost 22 lbs.
Regarding 'keeping the weight down', I learned from this app itself why it is difficult:
1. Not eating anything for a week is not only a bad strategy to lose weight it is actually a good strategy to gain weight afterwards. In my own experience whenever I tried to lose weight by eating less I lost a lot of weight but gained more than what I lost afterwards. You cannot stay hungry forever and if you lose more than 2 lbs per week your body goes into starvation mode, burning any stored energy rapidly, and rapidly storing anything you eat afterwards as fat just in case you don't get food again. Body is more intelligent than we think. 2. Once a fat cell is born it craves fat and that makes you hungry. Rapidly losing weight by staying hungry will only remove fat from fat cells but won't kill them. Weight loss must be sustained for longer time to have any permanent effect. 3. I have replaced white rice with brown rice, white bread with whole grain wheat bread and started eating sprouts and corn, oranges, guava etc. other fruits. Sprouts are killer deal man - you eat 200g of it you will hardly feel hungry for hours. 4. You need to do some physical exercise everyday - not intense, just walking is okay. But you have to be consistent so your body learns how much energy you are going to lose anyway and doesn't store much fat.
I have yet to start heavy exercises but I like the effect on my body :)