Short answer. The price of a custom app depends mostly on how many different screens and user types it has, what it must connect to, and how much of it already exists as a standard building block. A small focused tool costs far less than a full platform. The reliable way to know is a short plan first, then a fixed quote.
What drives the price
- The number of user types (for example customer, staff, manager), because each sees different screens.
- Connections to other systems, such as payments, accounting or a supplier feed.
- Rules and exceptions: the more 'it depends', the more work.
- Whether the app can reuse standard parts such as logins, contacts, invoices and notifications.
How to keep it down
- Start with the smallest version that solves the real problem.
- Put nice-to-haves on a later list instead of the first build.
- Use standard building blocks where they fit. In our case that means building on BonusFlow, which already has logins, contacts, invoicing and website forms.
How we quote
- You describe the idea. We turn it into a plan with screens, users and a size estimate.
- You get a clear quote before anything is built, and you decide whether to go ahead.
Questions
Do you charge for the plan?
Sending an idea is free, and so is the first reply with what it would take.
Are there running costs after the build?
Yes, hosting and maintenance, so the app keeps working and stays up to date. The quote shows these separately.
Updated 9 November 2026 by the BonusHosting team.
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