Kotlin Multiplatform (KMP) is a technology that allows you to create applications for different platforms using common code. This can be useful for several reasons:

1. Reduction of development time. The shared code can be reused, which reduces the time spent developing applications for different platforms.
2. Simplify support and updates. Changes to the shared code are automatically reflected in all applications, which simplifies support and updating.
3. Improving the quality of the code. Using common code helps to ensure consistency and quality.
4. Cost reduction. Code reuse can reduce application development and maintenance costs.
5. Increase productivity. Kotlin is a modern programming language that provides high performance and code efficiency.

To approximate the cost of the backend, you need to count the number of database tables. It takes approximately 25 hours to develop a single table, with all the necessary methods for adding, deleting, editing, and fetching data. In our example of a simple online store, there are the following tables: users, catalog items, baskets, orders. In this example, 4 tables, respectively, will need about 100 hours. It is clear that calculating the number of tables is even more difficult than the number of screens, but you can get an approximate cost of development in order to download a commercial offer for yourself or your supervisor. And when you stop at us, then call or leave a request in order to make an accurate calculation.