Will the 7 minute workout app make you stronger?

I just recently bought the 7 minute workout challenge app, and I read some articles online that say it will help you lose weight, but it is not good for becoming stronger. I didn't know if this was real and I have been doing the workout 2 times a day hoping to be stronger. If this workout isn't good for muscle, what is a good app for the iPhone that have workouts you can do at home to get stronger (without machines)?

7 minutes of anything won't do nothing

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