Mobile App Development Costs in the UK: What to Budget in 2026

How much does an app cost? is impossible to answer in one number — but it is possible to understand what drives the price so you can budget realistically and avoid nasty surprises. Here's a clear guide to mobile app development costs in the UK in 2026.

What actually drives app cost

Cost is driven by complexity: number of features, custom design, backend and integrations, platforms (iOS, Android or both) and ongoing maintenance. Two apps that look similar can differ wildly in price based on what's under the hood.

Simple, mid-range and complex builds

A simple app with a handful of screens costs far less than a data-heavy product with accounts, payments and real-time features. Knowing which band you're in is the first step to a realistic budget.

Native vs cross-platform economics

Building separately for iOS and Android costs more than a cross-platform build with React Native or Flutter. For many businesses, cross-platform delivers most of the value for a fraction of the cost.

Don't forget the cost after launch

Apps aren't one-off purchases. Budget for hosting, updates, OS compatibility, support and improvements — typically a meaningful percentage of the build cost each year.

How to get more for your budget

Start with an MVP that proves the core value, validate with real users, then invest in features that earn their keep. A phased approach prevents expensive over-building before demand is proven.

Frequently asked questions

How much does a mobile app cost in the UK?

It depends on complexity — simple apps cost far less than feature-rich products. The biggest drivers are features, design, integrations and platforms. We scope a realistic figure in a consultation.

Is cross-platform cheaper than native?

Usually yes — a single React Native or Flutter codebase costs less than building separately for iOS and Android while still shipping genuine mobile apps.