How Much Does It Cost to Build a Mobile App in 2026?

The honest answer is a range, and the range is wide: anywhere from $15,000 for a simple single-platform app to well over $300,000 for a complex marketplace or AI-powered product on both iOS and Android. That spread is not vendors being evasive. It is because the words "mobile app" describe everything from a weekend utility to a system with the complexity of a small bank.

What matters is understanding the three or four variables that actually move the number, so you can place your own app inside that range with confidence. I built a free mobile app cost calculator that turns those variables into a concrete estimate, but the logic behind it is worth understanding before you talk to anyone.

The four things that decide the price

The first variable is the number of platforms. A single fully native app for iOS or Android is the baseline. Building two separate native apps for both platforms roughly doubles the platform engineering work and the ongoing maintenance, because you are writing and maintaining two codebases in two languages. This is why cross-platform frameworks exist, and why for most apps they are the right call. A single React Native or Flutter codebase ships to both stores and typically costs 30 to 50 percent less than two native apps.

The second variable is the depth of the backend. The screens a user taps through are rarely the expensive part. Cost lives in the parts nobody sees: authentication, a real database with syncing, payment and subscription handling, push notifications, offline support, and third-party integrations. An app with no backend is cheap. An app with payments, real-time updates, and a handful of integrations costs far more, regardless of how simple the screens look.

The third variable is design. A template-based interface is the floor. A custom design tuned to your brand sits in the middle. A premium, highly polished experience with bespoke animation and interaction adds a real premium because it takes real craft.

The fourth variable, increasingly, is AI. Adding LLM features, a chatbot, agents, or custom models is not a small bolt-on. It brings its own cost layer for model selection, prompt design, evaluation, and the usage costs that continue after launch.

The ranges you can expect

A simple single-platform app with a light backend typically runs $15,000 to $40,000. A moderate app with custom design, accounts, payments, and a real backend lands between $40,000 and $120,000. A complex marketplace, social product, or AI app on both platforms commonly runs $120,000 to $300,000 or more for a first real version.

Those are industry ranges for studio and agency builds. Two choices pull your number toward the lower end of each band: choosing cross-platform over two native apps, and shipping a focused first version rather than building everything at once.

The cost most founders forget

Building the app is the down payment. Maintenance is the mortgage. Plan for roughly 15 to 25 percent of the original build cost every year to cover bug fixes, hosting, third-party fees, security patches, and the two annual OS updates from Apple and Google that will break an unmaintained app. Mobile tends to land at the higher end of that band because the OS update treadmill never stops.

How to keep the first version lean

The single biggest lever you control is scope. Every feature you defer to version two is money you keep in the bank until you have evidence it is worth spending. A focused first version, built on a cross-platform stack, shipped in weeks rather than months, lets you learn from real users before you commit to the expensive parts. That is the entire logic of the 14-day sprint model: ship the smallest thing that proves the idea, then expand based on what users actually do.

Run your own numbers in the mobile app cost calculator to see a cost range, timeline, and maintenance budget for your specific app. Then, if you want a fixed-price estimate for shipping it, book a call.