App Development Cost Calculator

App development cost in the UK varies significantly depending on the type of application, the number of platforms targeted, the complexity of features required, and whether you need a custom backend or can rely on existing third-party services.

A simple mobile app or business web application — one with a handful of screens, a contact form and basic user flow — can be delivered for £2,500 to £12,000. A more involved project with user accounts, payment processing, external API integrations and an admin panel typically falls in the £12,000 to £35,000 range. Full SaaS platforms, booking marketplaces, and custom enterprise systems regularly exceed £40,000.

Timeline also affects cost. Projects with a fast or urgent delivery requirement often involve additional resource allocation that increases the overall budget by 20–40%.

The main factors that drive app development cost are:

• App type — a simple mobile app costs far less than a SaaS platform or booking marketplace. The business logic complexity is the single biggest cost lever.
• Platform coverage — building for web only is cheapest. Adding iOS and Android natively doubles or triples platform scope. Cross-platform frameworks reduce this overhead.
• Authentication & accounts — simple email login is straightforward; social login, multi-factor authentication, and role-based access control add meaningful engineering time.
• Features — payments, push notifications, real-time chat, maps, booking calendars, video, and offline support each add weeks to a build.
• Third-party integrations — connecting to CRMs, ERPs, delivery APIs, accounting software or data providers requires custom integration work that adds to both cost and maintenance.
• Backend & infrastructure — a serverless API is lighter and cheaper to run than a dedicated microservices backend. Database architecture, security, and scalability requirements all shape this cost.
• Design quality — basic UI templates cost less than fully branded, motion-rich premium interfaces. UI/UX design is often 20–30% of total project cost.

JW Digital builds bespoke web apps, mobile apps and SaaS platforms for businesses across the UK. We work with a fixed scope and transparent pricing — no hourly rate ambiguity, no scope creep surprises. Every project starts with a discovery phase to validate requirements and agree a fixed delivery plan before any build begins.

Our stack centres on modern frameworks — React, Next.js, React Native and Node.js — giving you fast, scalable applications that are maintainable long-term. We handle architecture, design, development, testing and launch, and offer ongoing support and hosting once your app is live.

Use the calculator above to get an instant estimate, then get in touch for a fixed quote based on your actual requirements.