A delivery app can look simple from the outside. A user taps a few buttons, a provider accepts a request, a live location pin moves across the map, and a payment confirmation appears. Behind that smooth flow sits a stack of product decisions, design work, coding, testing, cloud services, support tools, and ongoing maintenance. That is why two on-demand apps with similar ideas can have very different budgets. A basic service booking app may cost a fraction of a multi-city food