Salary is different for any job depending on where you live. I see that you are in Connecticut, the salary range for a Mobile App Developer in your state is $74.6-121K.
Glass door is a really good site to tell you the average salary of any career. You can even search how much the same job pays in a different location, which is helpful if you are open to moving.
Take a look at the low ends as well, it is a possibility that at the beginning of your career, you will make what's on the low end until you gain more experience in your field.
Brittany recommends the following next steps: