There is no one answer as to the cost of a custom web application. There are two factors that have the greatest impact on the price of a completed software solution. The first one is the project complexity. The more complex an application you want to build, the higher the cost of web app development services will be. The second factor is the location of the web application development company. Software developers from Eastern Europe usually set lower hourly rates than their counterparts in North America or Western Europe. It means that if you hire a software development company from, say, Poland, Montenegro, Ukraine, or Belarus, you will get a cost-effective yet high-quality custom software solution.