iOS App Development
Premium native iOS apps built with Swift and SwiftUI. App Store-compliant, blazing fast, and designed to convert users into loyal customers.
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#1 App Development Agency in London & UK
Your Vision,
Our Code —
Apps That Perform
Award-winning mobile & web app development agency in London. We build iOS, Android, and web apps for startups, scale-ups, and enterprises across the UK and beyond.
200+
Apps Delivered
10+
Years Experience
4.9★
Client Rating
50+
Expert Developers
Our Services
App Development Services
App Development Services
Across the UK & Beyond
End-to-end mobile and web app development — from idea to launch and growth. Every service built for real business outcomes.
Android App Development
Native Android apps built with Kotlin and Jetpack Compose. Optimised for the full Android ecosystem — from Samsung to Pixel and beyond.
Learn more →Cross-Platform Development
One codebase, two platforms. React Native and Flutter apps that deliver near-native performance on iOS and Android — reducing cost by up to 40%.
Learn more →Web App Development
Scalable, secure web applications — SaaS platforms, client portals, dashboards, and Progressive Web Apps built with React, Next.js, and Node.js.
Learn more →UX/UI Design
User-centred design that converts. From wireframes and prototyping to polished UI — we create interfaces that users love and businesses trust.
Learn more →App Store Optimisation (ASO)
Maximise visibility on the App Store and Google Play. Keyword research, listing optimisation, A/B testing, and review management to boost downloads.
Learn more →AI & Chatbot Development
GPT-powered chatbots, intelligent automation, and AI features that save your users time and increase product stickiness. Built for UK businesses.
Learn more →App Maintenance & Support
Post-launch support packages covering bug fixes, OS updates, performance monitoring, and 24/7 uptime management. Retainers from £500/month.
Custom Software Development
Bespoke software — APIs, backend systems, cloud infrastructure, enterprise integrations, and SaaS platforms built exactly to your requirements.
Why Choose Us
Why 200+ UK Businesses Choose Us
We don't just build apps — we build digital products that drive measurable business outcomes.
10+ Years of App Development Excellence
Over a decade delivering successful apps across every major industry — from healthcare to fintech — in the UK, US, and globally.
Agile Delivery — On Time & On Budget
Sprint-based development with transparent weekly reporting. You're always in control of scope, timeline, and spend.
Enterprise-Grade Security & GDPR Compliance
Security-first architecture, GDPR-compliant data handling, and penetration testing as standard on every build.
Dedicated UK-Based Project Managers
A named PM available during UK business hours — no outsourcing your communication to overseas teams.
4.9★ Average Client Rating (127 Reviews)
Consistent 5-star ratings for quality, communication, and delivery excellence across Clutch, Google, and Trustpilot.
200+
Apps successfully launched
98%
Client satisfaction rate
£2M+
VC funding raised by clients
40M+
End users served
Our Process
How We Build Your App — Step by Step
A transparent, proven 6-step process that has delivered 200+ successful apps across the UK and beyond.
1
Discovery & Strategy
Free consultation — goals, users, budget, timeline.
2
UX/UI Design
Wireframes, prototypes, and polished UI for your approval.
3
Agile Development
Sprint builds with regular demos and feedback loops.
4
QA & Testing
Testing across devices, OS versions, and edge cases.
5
Launch & Deploy
App store submission and go-to-market support.
6
Growth & Support
Maintenance, ASO, and continuous optimisation.
Industries
We Build Apps for Every Industry
Deep domain expertise across all major sectors — so we understand your industry's requirements from day one.
Healthcare & MedTech
Fintech & Banking
E-Commerce & Retail
EdTech & Education
Real Estate & PropTech
Logistics & Supply Chain
Travel & Hospitality
Media & Entertainment
Food & Restaurant
Enterprise & SaaS
Fitness & Wellness
Startup & MVP
Technology
Our Technology Stack
Battle-tested, modern technologies for every layer of your app — mobile, backend, cloud, and AI.
React Native
Flutter
Swift / iOS
Kotlin / Android
Next.js
Node.js
Python
AWS / Azure
Firebase
PostgreSQL
Figma
OpenAI / AI
Client Reviews
What Our Clients Say
127 verified reviews. 4.9-star average. Here's what UK businesses say about working with us.
★★★★★
"Partnering with App Development Agency UK was a game-changer. Their bespoke solutions enhanced our operational efficiency and significantly boosted customer engagement across the UK. Truly impressive attention to detail."
★★★★★
"Their ASO and digital marketing services transformed how we reach our audience. Since our app launched, downloads have increased substantially. Exceptional support and insight into the UK market throughout."
★★★★★
"We needed a reliable partner for our health monitoring app, and ADA exceeded every expectation. The UX/UI is beautiful and intuitive. Our users across the UK have responded incredibly positively."
★★★★★
"Delivered our fintech MVP on time and on budget. The team understood regulatory requirements from day one and built a secure, scalable architecture. We've since raised £1.2M in seed funding."
★★★★★
"Best app development agency we've worked with in London. Transparent, communicative, and technically brilliant. Our React Native app launched simultaneously on iOS and Android with rave user reviews."
★★★★★
"From discovery to launch in 14 weeks. Remarkable. They integrated AR features into our retail app that competitors still haven't managed to implement. ADA are genuinely ahead of the curve."
FAQ
Frequently Asked Questions
Everything you need to know about app development in the UK — answered directly.
How much does app development cost in the UK?
App development in the UK typically costs: £5,000–£15,000 for a simple MVP or basic app; £15,000–£75,000 for mid-range apps with custom features; £75,000–£250,000+ for complex enterprise applications. Key cost factors include platform (iOS/Android/web), number of features, UI complexity, backend infrastructure, and third-party integrations. We provide free, no-obligation project estimates.
How long does it take to build a mobile app?
Typical timelines: 2–4 months for an MVP; 4–8 months for a full-featured app; 8–14 months for complex enterprise apps. Timelines depend on feature scope, integrations, design complexity, and review processes. We provide a detailed project roadmap during the initial free consultation.
Do you develop apps for both iOS and Android?
Yes. We build native iOS apps (Swift/SwiftUI), native Android apps (Kotlin/Jetpack Compose), and cross-platform apps using React Native and Flutter — which share one codebase for both platforms, reducing build time and cost by up to 40%. We recommend the best approach based on your goals, audience, and budget. Learn more about cross-platform development →
Are you a London-based app development agency?
Yes — we are London-based and serve clients across the entire UK including Manchester, Birmingham, Bristol, Edinburgh, Leeds, and Wandsworth. We also work internationally with clients in the US, Canada, and Australia. In-person meetings are available in London; all other clients are served via video call and collaborative tools.
Do you provide post-launch app maintenance and support?
Yes. Our post-launch packages cover bug fixes, iOS/Android OS updates, feature enhancements, performance monitoring, security patches, and App Store/Google Play management. Maintenance retainers start from £500/month and ensure your app stays current and competitive long after launch.
Can you help with App Store Optimisation (ASO)?
Yes. Our dedicated ASO service covers keyword research, listing optimisation, screenshot and preview video creation, A/B testing, review management, and competitor analysis for both the Apple App Store and Google Play Store. Learn more about our ASO service →
What is the difference between React Native and Flutter?
React Native (by Meta) uses JavaScript and renders near-native components — ideal when you have a web team or need NPM ecosystem access. Flutter (by Google) uses Dart and compiles to native code — ideal for pixel-perfect, high-performance UIs. We assess your team's skills and app requirements to recommend the right framework. Compare React Native vs Flutter →
Do you build apps for startups and MVPs?
Absolutely. We have a dedicated startup track — lean, fast, and investor-ready. Our MVP development process takes your idea to a testable product in 8–14 weeks. We help you validate assumptions before committing to full-scale development. Many of our clients have gone on to raise significant funding after launching their MVP with us.
Start Your Project
Ready to Build Your App?
Join 200+ UK businesses that chose App Development Agency UK to bring their digital vision to life. Get your free quote today.
Get In Touch
Let's Build Something Great Together
Tell us about your app idea. We'll get back within 24 hours with a free consultation and project estimate.
WhatsApp / Call
Email
Location
London, United Kingdom
Working Hours
Mon–Fri: 9am–6pm GMT