How Much Does a Mobile App Cost to Build?

A simple app can be built in a matter of weeks, a mid-complexity app typically takes a few months, and a complex app often runs six months to a year or more. Timeline depends on the same factors as cost: feature scope, platforms, integrations, and team size. Clear requirements and fast decision-making from your side are among the biggest levers on speed.

Development cost for a single platform is similar between the two, so the better question is where your users are. Many B2B products start on the platform their target customers use most, then expand. If you need both and want to save, a cross-platform framework is usually more economical than building two native apps.

Fixed price works best when your scope is well-defined and unlikely to change, because it gives you budget certainty. Hourly or time-and-materials works better for evolving products where you expect to learn and adjust as you go. Many teams use a hybrid: fixed price for a clearly scoped MVP, then time-and-materials for ongoing iteration.

Quotes differ because vendors make different assumptions about scope, quality, team seniority, and how much backend and testing work is included. A low quote often excludes work you will need later, such as proper QA, security, or scalable architecture. Compare what is actually included, not just the headline number.

You need a backend if your app stores user data, requires accounts, syncs across devices, processes payments, or connects to other systems. Purely local or content-only apps can sometimes avoid one. When in doubt, a lightweight backend-as-a-service is a low-cost way to start without over-investing early.