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Well it depends on what kind of app you want to develop or what kind of features you want in your app. If you want to develop a professional app with all features and different screens then i will cost you around 500 to 1000$. But if you want to develop a simple app with only features then it will not cost you much. If you need a company to hire mobile app developer then check out App Maisters which is the best app development company and they have mobile app developers in Texas.