looking for a specific type of app

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I am looking for a weight loss goal app. What I would like to be able to do is set a goal for weight loss. For example, the goal would be to lose 20 pounds in 10 weeks. The app would remind me to weigh in weekly and would say if I met my weight loss goal for that week. The app would also be able to tell me my average calories for the previous week. Is there anything out there like this? Thanks

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