Digital One Agency builds production mobile apps for UK businesses — native iOS, native Android, Flutter and React Native — with delivery to the App Store UK and Google Play UK end-to-end. We are a senior, founder-led engineering team headquartered on the Gold Coast (Australia) with active UK clients across London, Manchester, Edinburgh and Birmingham.
Typical UK mobile app projects range from £18,000 to £140,000, delivered in 8–24 weeks. We invoice in GBP, are UK-VAT compliant, and maintain time-zone overlap during UK working hours.
What We Build for UK Mobile Clients
- Native iOS apps in Swift / SwiftUI for iPhone and iPad, with App Store UK submission, TestFlight beta management, and post-launch optimisation.
- Native Android apps in Kotlin / Jetpack Compose, with Google Play UK submission, internal/closed/open testing tracks, and Play Store optimisation.
- Flutter apps — single codebase, both iOS and Android, ideal for MVPs and budget-sensitive launches.
- React Native apps — when you have an existing React/web team and want to share components across web and mobile.
- AI-powered apps — embed Claude, GPT-5, Gemini, on-device LLMs, voice agents, RAG search, AI automation directly into mobile UX.
- Fintech & payment apps — Stripe, Open Banking (UK), Apple Pay, Google Pay, BNPL integrations, KYC/AML flows.
Where We Deliver Mobile in the UK
Our UK mobile clients are based in London, Manchester, Edinburgh, Birmingham, Bristol, Leeds and Glasgow — fintech startups, healthcare platforms, marketplace founders, and established SaaS companies adding native apps to their stack. We have shipped to the UK App Store and Google Play UK across multiple verticals.
Why UK Founders Choose Digital One Agency
- Senior engineers from day one — no junior pass-through, no offshore relay. The architect on your discovery call is the architect on your build.
- Fixed-scope quotes, milestone-billed. You know the price before we write a line of code.
- UK-native delivery — GBP invoicing, VAT compliant, GDPR aware.
- End-to-end — strategy, UX/UI, build, App Store + Play Store submission, post-launch optimisation.
- You own the code — bespoke build, not a SaaS reseller. Take it in-house any time.
UK Mobile App Pricing (Typical Ranges)
- Discovery / scoping engagement: £2,500 – £5,000 (1–2 weeks)
- MVP mobile app (single platform): £18,000 – £40,000 (6–12 weeks)
- Cross-platform Flutter app (iOS + Android): £30,000 – £75,000 (10–16 weeks)
- Native dual-platform app (Swift + Kotlin): £55,000 – £120,000 (14–24 weeks)
- AI-powered native app: £45,000 – £140,000 (12–22 weeks)
- App maintenance retainer: £1,500 – £6,000/month
Our UK Mobile Engagement Process
- Free 30-minute discovery call — we scope the app, identify the right tech (native vs cross-platform), and tell you what’s realistic for your timeline.
- Fixed-fee discovery (£2,500–£5,000, 1–2 weeks) — wireframes, technical spec, App Store strategy, fixed-scope quote to ±10%.
- Build phase (6–22 weeks) — milestone billing, weekly demos, TestFlight/Internal Testing access from week 2.
- App Store + Play Store submission — we handle the UK store submissions end-to-end, including review responses.
- Post-launch optimisation — ASO, crash analytics, performance monitoring, ongoing feature work.
Tech Stack We Use
- Native iOS: Swift, SwiftUI, UIKit, Combine, Core Data
- Native Android: Kotlin, Jetpack Compose, Coroutines, Room, Hilt
- Cross-platform: Flutter (Dart), React Native (TypeScript)
- Backend: Node.js, Python, Go, Supabase, Firebase
- AI integration: Claude SDK, OpenAI SDK, Gemini SDK, on-device CoreML / TensorFlow Lite
- Payments: Stripe, Apple Pay, Google Pay, Open Banking UK
- Analytics: Mixpanel, Amplitude, Firebase Analytics, Segment
Get a Custom Quote — Free 30-Minute Discovery Call
If you are a UK business considering a mobile app, talk to us before you commit. The 30-minute call is free, the scoping engagement gives you wireframes and a fixed-scope quote, and you keep the spec whether you build with us or not.
- Senior engineer on the call from minute one
- Fixed-scope quote with milestone billing — no hourly rates
- UK references on request
- App Store + Play Store submission included