App Development Cost in the UK (2026 Guide)

We get asked about app development costs more than anything else. And honestly, the range of answers out there is so wide it's almost useless. "Somewhere between £5,000 and £500,000" doesn't help anyone plan a budget.

So here's what we actually tell people when they ask. These numbers come from 20+ years of building mobile apps and web applications for UK businesses. We've built everything from a simple coaching app to enterprise recruitment platforms, and the costs have varied for very specific reasons that we'll break down in this guide.

If you want a quick answer: a simple app in the UK costs £10,000 to £40,000. A mid-range app costs £40,000 to £100,000. A complex app costs £100,000 to £250,000 or more. But those numbers mean nothing without context, which is what the rest of this guide provides.

App Development Cost by Complexity

The single biggest factor in app cost is how complex the thing actually is. Here's how we break it down into three tiers, based on what we've seen across our own projects and the wider UK market.

These are honest ranges based on UK agency pricing. You'll find cheaper quotes from offshore teams and more expensive quotes from large London agencies. We'll cover why those prices differ later in this guide.

A note on what "simple" actually means. Clients often describe their app idea as "quite simple" and then list 40 features. A genuinely simple app has one core function, a handful of screens, and straightforward data storage. The moment you add user accounts, payments, real-time updates, or admin tools, you've moved into mid-range territory.

App Cost by Platform: iOS vs Android vs Cross-Platform

One of the first decisions you'll make is which platform to build for. This choice affects your budget significantly.

Native iOS or Android

Building a native app means writing code specifically for one platform. A native iOS app is built in Swift. A native Android app is built in Kotlin. Each gives you the best performance and full access to device features (camera, GPS, push notifications, biometrics).

Cost impact: If you want both iOS and Android as native apps, you're building two separate applications. That roughly doubles your development cost.

Cross-Platform (React Native, Flutter)

Cross-platform frameworks let you write one codebase that runs on both iOS and Android. React Native (used by Facebook, Instagram, Shopify) and Flutter (used by Google Pay, BMW) are the two leading options.

Cost impact: Cross-platform development typically costs 30-40% less than building two native apps, because you're maintaining one codebase instead of two.

Progressive Web Apps (PWAs)

A PWA is a web application that behaves like a mobile app. Users access it through their browser, and it can be added to their home screen. PWAs work offline, support push notifications, and don't require App Store or Google Play approval.

Cost impact: PWAs are the cheapest option because there's no app store submission process and no platform-specific code.

Which should you choose?

For most UK businesses building their first app, we recommend cross-platform development. You get both iOS and Android from a single build, and the quality gap between cross-platform and native has shrunk considerably in the last few years. We built Floc as a cross-platform mobile app serving both iOS and Android, and user satisfaction hit 80%.

Native makes sense when performance is critical (games, AR, heavy animations) or when you need deep platform integration that cross-platform frameworks can't deliver.

App Cost by Development Phase

Where does the money actually go during an app build? Here's a rough breakdown of how costs are allocated across the development lifecycle. These percentages are based on our own project data and align with UK industry averages.

For a £60,000 app, that looks like:

• Discovery and planning: £6,000-£7,200
• UI/UX design: £6,000-£9,000
• Development: £30,000-£36,000
• Testing and QA: £6,000-£9,000
• Deployment: £1,800-£3,000
• Project management: £3,000-£6,000

The development phase is always the largest cost. But the phases that save you the most money are discovery and design. Getting the requirements right before writing code prevents expensive rework later. We've seen projects from other agencies come to us mid-build because they skipped discovery and ended up building the wrong thing.

7 Factors That Affect App Development Cost

Beyond complexity and platform choice, these factors determine where your project lands within the price ranges above.

1. Feature count and complexity

Every feature adds cost. A user login system, a payment gateway, a chat function, push notifications, an admin dashboard, an analytics module: each of these is a separate piece of work that needs designing, building, testing, and maintaining. The difference between a 5-feature app and a 25-feature app is often £50,000+.

Our advice: Start with the features that deliver the most value to users. Launch with those. Add the rest after you've validated the core product.

2. Third-party integrations

Connecting your app to external services (payment processors like Stripe, CRMs like Salesforce, accounting tools like Xero, government APIs like HMRC) adds development time. Each integration has its own documentation, authentication requirements, and edge cases. Budget £2,000-£10,000 per integration depending on complexity.

3. Custom design vs template-based UI

A fully custom UI designed from scratch by a UX team costs more than using a design system or component library. Custom design gives you a unique look and better user experience, but for an MVP or internal tool, a well-implemented template-based approach can save £5,000-£15,000.

4. Backend complexity

Some apps need a simple database and a few API endpoints. Others need real-time data processing, complex permission systems, multi-tenancy, or machine learning features. The backend is invisible to users but often accounts for the majority of development time.

5. Security and compliance requirements

Apps handling financial data need PCI DSS compliance. Healthcare apps need to meet NHS Digital standards. Any app processing personal data of UK residents needs UK GDPR compliance. These requirements add to the architecture, testing, and documentation costs. Budget an additional 10-20% for apps in regulated industries.

6. App store requirements

Publishing on the Apple App Store and Google Play isn't free. Apple charges £79/year for a developer account. Google charges a one-time £20. But the real cost is meeting their review guidelines. Apple in particular has strict requirements around design, privacy, and functionality that can require additional development time. Rejected submissions mean rework and delays.

7. Ongoing maintenance

This isn't part of the initial build cost, but it affects your total budget. After launch, apps need regular updates for OS changes (Apple and Google release major updates annually), security patches, bug fixes, and feature additions. Plan for 15-20% of the initial build cost annually for maintenance.

UK Developer Rates vs Offshore: What You're Actually Paying For

The hourly rate your development team charges is one of the biggest variables in app cost. Here's how rates compare across common sourcing regions.

Why the UK premium exists (and when it's worth paying):

Lower hourly rates don't always mean lower project costs. We've had clients come to us after failed offshore projects that cost them more in total than building with a UK team from the start. The common problems:

Communication overhead. Timezone differences of 4-10 hours mean slower feedback loops. A question that gets answered in 5 minutes with a UK team can take 24 hours with an offshore team. Multiply that across hundreds of decisions during a build, and projects stretch out.

Cultural context. If you're building for UK users, your developers need to understand UK business practices, regulations (UK GDPR, FCA, HMRC), and user expectations. We've seen offshore teams build US-style date formats, ignore VAT calculations, and miss accessibility requirements that UK users expect.

Quality consistency. Good offshore developers exist. But the variance is wider. With a UK agency, you can visit the office, meet the team, and hold them accountable under UK contract law. That matters when you're investing £50,000+ in a business-critical application.

When offshore makes sense: If you have a clear, detailed specification, a technical project manager who can bridge the communication gap, and a project that doesn't involve UK-specific regulations or compliance, offshore development can deliver good results at lower cost.

Is a Custom App Worth the Investment?

A custom app is a significant investment. Before committing, it's worth asking whether the return justifies the cost. Here's how we think about it.

The ROI question isn't "Can we afford to build this?" It's "Can we afford not to?"

For businesses where the app is the product (a SaaS tool, a marketplace, a consumer app), the answer is straightforward: you need custom development because off-the-shelf tools can't deliver your core product.

For businesses where the app supports operations (internal tools, client portals, process automation), the calculation is different. Look at what the manual process costs you today:

• How many hours per week does your team spend on the tasks this app would automate?
• What's the hourly cost of those staff members?
• What revenue are you losing because your current process can't scale?
• What's the error rate on manual processes, and what do those errors cost?

If a £60,000 app saves 20 hours of staff time per week at an average cost of £25/hour, that's £26,000/year in direct savings. The app pays for itself in under three years, and you still own the software after that.

Our Octopaye project is a good example. The recruitment payroll company was processing 1,000 timesheets in 45 minutes using spreadsheets and third-party tools. After we built their custom platform, they could process 15,000 timesheets in under one minute. That didn't just save time. It removed the ceiling on how much the business could grow.

Case Study: Floc Mobile App

Floc is a project that shows what a mid-range app development budget delivers when the scope is well-defined.

The brief: Sports coaches were drowning in admin. Separate tools for bookings, payments, participant data, and session feedback. Each tool solved one problem but created another: data lived in five different places, nothing talked to anything else, and coaches were spending hours on admin instead of coaching.

What we built: A cross-platform mobile app (iOS and Android) for coaches, paired with a web-based admin dashboard for organisations. The app handles:

• Session booking and management
• Integrated payment collection
• Participant data and consent forms
• Session feedback and reporting

The approach: We used cross-platform development to keep costs down while delivering native-quality experiences on both iOS and Android. The web dashboard gives administrators a complete overview without needing to download anything.

The results:

• 80% of users report high satisfaction with the platform
• Coaches report significant time savings on administration
• Payment collection improved (fewer missed payments, better cash flow)
• One unified system replaced four or five separate tools

Stuart Twigg, Director at Floc, said: "Andy and the team at Make IT Simple were great partners. They listened when changes were needed but stood firm when proposals wouldn't work. No project runs smoothly throughout, yet they managed everything well and kept momentum."

Why this matters for cost planning: Floc is a mid-range app that required cross-platform mobile development, a web dashboard, payment integration, and ongoing support. If you're building something similar in scope, you're looking at the £40,000-£100,000 range with a 4-7 month timeline.

Case Study: Octopaye

Octopaye sits at the complex end of the scale and shows how app development costs increase with business logic complexity.

The problem: A recruitment payroll company (formerly Recruit Payroll) was running their entire operation on spreadsheets and third-party software. Processing 1,000 timesheets took 45 minutes. Every new client meant more manual work, more errors, and more staff. Growth was physically constrained by the process.

What we built: A complete online payroll platform handling PAYE, multi-company payroll, and direct HMRC integration. The system supports irregular payment patterns across multiple clients and locations, which is standard in recruitment but tricky to automate.

The results:

• Processing jumped from 1,000 timesheets in 45 minutes to 15,000 timesheets in under one minute
• The system achieved HMRC approval, something described as "almost unheard of for businesses of their scale"
• The business could scale operations and take on new clients without proportionally adding staff

We still work with Octopaye today. The platform has been in continuous development for years, evolving as the business grows and regulations change.

Why this matters for cost planning: Octopaye involved complex business logic (UK payroll calculations, tax rules, multi-company support), a government integration (HMRC), strict compliance requirements, and years of ongoing development. Projects at this level of complexity sit in the £100,000-£250,000+ range. The ongoing maintenance and feature development adds to the total investment, but the ROI is clear: the business couldn't operate at its current scale without the platform.

Hidden Costs and Ongoing Maintenance

The build cost is only part of the picture. Here are the costs that catch people off guard.

App store fees

• Apple Developer Programme: £79/year
• Google Play Developer Account: £20 one-time fee
• Apple's 30% commission on in-app purchases (15% for small businesses earning under $1M/year)
• Google's 15% commission on the first $1M in revenue, 30% thereafter

Infrastructure and hosting

Your app needs servers to run. Costs vary based on usage, but budget £100-£500/month for a typical app. High-traffic or data-heavy apps can cost £1,000-£5,000/month or more. Cloud providers like AWS and Azure charge based on usage, so costs scale with your user base.

Maintenance and updates

This is the one most businesses underestimate. After launch, your app needs:

• OS updates: Apple and Google release major OS updates annually. Your app needs testing and potential updates each time. Budget £2,000-£5,000 per major OS release.
• Security patches: Vulnerabilities in third-party libraries are discovered regularly. Keeping your app secure requires active monitoring and patching.
• Bug fixes: Real users find bugs that testing didn't catch. The first 3-6 months after launch are usually the busiest for bug fixes.
• Feature updates: User feedback will drive new feature requests. Having a development partner who knows your codebase makes this faster and cheaper.

The rule of thumb: Budget 15-20% of your initial build cost per year for maintenance. For a £60,000 app, that's £9,000-£12,000 annually.

Legal and compliance costs

• Terms of service and privacy policy (£500-£2,000 for a solicitor to draft)
• UK GDPR compliance documentation
• Accessibility audit (if required)
• Data Protection Impact Assessment (for apps processing sensitive personal data)

Design refresh

Mobile design trends shift. App store review guidelines change. After 2-3 years, most apps benefit from a design refresh to keep the user experience current. Budget £5,000-£15,000 for a redesign, depending on scope.

How to Reduce App Development Costs

You don't need to cut corners to manage costs. Here are the approaches that actually work.

Start with an MVP. Build the core feature set that proves your concept works. Launch it. Gather real user feedback. Then invest in the features users actually want rather than the ones you assumed they'd need. This approach regularly saves 30-50% on the initial build because you're not building features that end up unused.

Choose cross-platform over native (when appropriate). For most business apps, cross-platform development with React Native or Flutter delivers 90% of the native experience at 60-70% of the cost of building two native apps.

Prioritise ruthlessly. The difference between a £40,000 app and a £100,000 app is often 15 features you could add in phase 2. List every feature, rank them by user value, and draw a line. Everything above the line goes in the initial build. Everything below it goes on the roadmap.

Reuse where possible. Payment processing doesn't need building from scratch. Use Stripe. User authentication doesn't need a custom solution. Use Auth0 or Firebase Auth. Good developers know when to build custom and when to integrate existing services.

Get the specification right. The most expensive part of any project is rework. A clear, detailed specification that everyone agrees on before development starts prevents the "actually, we want it to work differently" conversations that add weeks and thousands of pounds to a project.

Choose the right development partner. An experienced team that's built similar apps before will work faster and make fewer mistakes than a team learning as they go. Their hourly rate might be higher, but the total project cost is often lower.

How to Choose a UK App Developer

If you're evaluating development agencies, here's what to look for.

Check their mobile app portfolio. Not just their web work or their design portfolio. Building mobile apps requires specific expertise in platform guidelines, device testing, app store submission, and performance optimisation. Ask to see apps they've shipped and download them from the App Store or Google Play.

Ask about their process. A good agency should walk you through discovery, design, development, testing, and deployment without hesitation. If they jump straight to "tell us what you want and we'll build it," that's a warning sign. The discovery phase is where you prevent expensive mistakes.

Understand their pricing model. Fixed price gives you budget certainty but works best when requirements are well-defined. Time and materials is more flexible but requires trust and transparency. Ask which model they recommend for your project and why.

Talk to their clients. References matter more than website testimonials. Ask for contact details of previous clients with similar projects. Ask those clients about communication, problem-solving, and whether the project came in on budget.

Confirm ongoing support. Building the app is half the job. You need a partner who'll maintain it, update it, and help it grow. Ask what their support agreements look like and what response times they commit to.

Check UK credentials. For apps handling sensitive data, confirm where the team is based, where data will be hosted, and whether they understand UK regulations. A team based in the UK, building under UK contract law, with data hosted in UK data centres, gives you a level of control and compliance confidence that's hard to replicate with offshore arrangements.

Frequently Asked Questions

How much does it cost to develop an app in the UK?

App development in the UK typically costs between £10,000 and £250,000+, depending on complexity. A simple app with basic features costs £10,000-£40,000. A mid-range app with user accounts, payments, and custom design costs £40,000-£100,000. Complex apps with multiple integrations and compliance requirements cost £100,000-£250,000 or more. These figures are based on UK agency rates of £75-£150 per hour.

How much does a simple app cost?

A simple app in the UK costs £10,000 to £40,000. "Simple" means a single-platform app with limited features, basic UI, and minimal backend logic. Examples include a basic booking tool, an internal utility app, or an MVP to test a business idea. The moment you add user accounts, payment processing, or an admin dashboard, costs move into the mid-range bracket.

How long does it take to develop an app?

A simple app takes 2-4 months. A mid-range app takes 4-7 months. A complex enterprise app takes 6-12 months or longer. These timelines include discovery, design, development, testing, and deployment. An MVP approach can get a working product into users' hands faster, with additional features added in later phases.

iOS vs Android: which costs more to develop?

The development costs are roughly similar for either platform. The expensive scenario is building both as native apps, which roughly doubles the cost because you're maintaining two separate codebases. Cross-platform frameworks (React Native, Flutter) solve this by letting you build one app that runs on both platforms, typically costing 30-40% less than two native builds.

How much does app maintenance cost per year?

Budget 15-20% of your initial build cost per year for maintenance. For a £60,000 app, that's £9,000-£12,000 annually. This covers OS compatibility updates (when Apple and Google release new versions), security patches, bug fixes, and minor feature improvements. This doesn't include major new feature development, which would be scoped and priced separately.

Can you build an app for under £10,000?

It's possible but limited. For under £10,000, you're looking at a very basic single-platform app, a PWA (progressive web app), or an MVP with stripped-back features. No-code tools like FlutterFlow or Adalo can reduce costs further, but they come with limitations on customisation and scalability. If your app needs custom business logic, payment processing, or backend integration, £10,000 is unlikely to be enough for a production-ready product.

What is the hourly rate for app developers in the UK?

UK app developers typically charge £75-£150 per hour, depending on location and experience. London agencies tend toward the higher end (£100-£175/hr). Agencies outside London range from £75-£125/hr. These rates cover a full team (project manager, designer, developers, QA), not just a single developer. Freelance developers in the UK charge £40-£100/hr but you'll need to manage the project yourself.

How much does it cost to put an app on the App Store?

Apple charges £79 per year for a Developer Programme membership, which is required to publish on the App Store. Google charges a one-time £20 registration fee for a Play Console account. If your app includes in-app purchases or subscriptions, Apple takes a 30% commission (15% for businesses earning under $1M/year through the App Store Small Business Programme). Google takes 15% on the first $1M and 30% after that.

What's the difference between native and cross-platform app costs?

Native development means building separate apps for iOS (using Swift) and Android (using Kotlin). Cross-platform means building one app with a framework like React Native or Flutter that runs on both. Building two native apps costs roughly £80,000-£200,000 for a mid-range project. Cross-platform costs £35,000-£80,000 for the same scope, a saving of 30-40%. The trade-off is that native apps can access all device features and may perform slightly better for graphics-heavy applications.

Is it cheaper to build a web app or a mobile app?

Generally, yes, web apps are cheaper. A web application runs in a browser and doesn't need app store submission or platform-specific code. A mid-range web app typically costs £15,000-£100,000, while a comparable mobile app costs £40,000-£100,000+ for cross-platform or £80,000-£200,000 for both native platforms. However, if your users need offline access, push notifications, camera integration, or other device-specific features, a mobile app (or at least a PWA) is the better choice. We cover web application costs in detail in our bespoke web application development guide.

Do I need an app, or would a website work?

If your users mainly consume information (reading articles, browsing products, checking opening times), a responsive website is cheaper and easier to maintain. If your users need to perform tasks regularly (booking, payments, tracking, communication) and would benefit from being on their phone, a mobile app makes more sense. If you're unsure, a PWA gives you some app-like functionality without the full cost of native development. We're happy to talk through which approach fits your situation during a free consultation.

What should I prepare before approaching an app developer?

You don't need a full technical specification. What helps most is: a clear description of the problem you're solving, who will use the app and what they need to do with it, any existing tools or systems the app needs to connect to, a realistic budget range, and a target launch date (even if rough). The more context you provide about your business and users, the more accurate the estimate will be. A good development agency will help you refine all of this during the discovery phase.

Next Steps

If you're planning a mobile app for your business, we're happy to talk through your requirements and give you an honest estimate. We'll tell you if your budget is realistic, which approach (native, cross-platform, or PWA) fits your situation, and what an MVP version of your app could look like.

We've been building mobile applications in the UK for over 20 years, and our clients include businesses in sports, recruitment, healthcare, and more.

Get in touch for a free consultation: Contact us or call +44 (0) 1905 700 050.

See our work: View our case studies to see what we've built for businesses like yours.