nice but simple app, the design work will likely take a designer about a week, which will cost you about $6,000. The server side will likely require a developer about 2 weeks of work, or about $12,000. Similarly, the app could be written in about 2 weeks as well, another $12,000. Add $5,000 for project management, hosting fees for a year, debugging, unforeseen delays, and your total budget is around $35,000