If you’re searching for an acclaimed software agency in Central Europe, it’s safe to assume an average rate for one man-day of development will be about 320 GBP. Please keep in mind that this rate is an approximation and the actual numbers may vary depending on your project, the origin of the development team, and other factors.
Moreover, note that all the additional costs will be charged as extra. Design, project management, setting up a backend environment, or app maintenance is usually billed separately. The scope of these additional services is often decided before the project starts and depends on your needs and resources.