It is quite difficult to give estimation on development cost of custom software as each software will be customised and unique. There aren’t any two custom-built applications of the same category. So, sharing an approximation of the costs without understanding specific requirements of project is tricky.
Several aspects are there that might lead to the costs of custom software development including the size of software, design specifications, the complexity of software, migration of existing data, integration with other systems, usage patterns and much more.