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The cost of developing a web application depends on many factors such as the scope, complexity, desired quality and the way of development. In addition, the urgency and the material that may already be available play a decisive role in determining the price. A generally valid statement on the price can therefore only be made after a detailed consultation or the submission of a project tender. However, the following information can be taken as a rough cost framework.
A scope-reduced web application (MVP) can usually be developed for around 15,000-30,000€. Full-scale applications with connections to various interfaces and with many different functions and independent backend cost 50,000-100,000€. The limit upwards is open. I will gladly advise you on the costs of your web project.