Building a mobile app is one of the most significant technology investments a UK business can make. Done well, it creates a direct, always-on channel to your customers, strengthens brand loyalty, and opens revenue streams that your website cannot match. Done poorly, it can drain your budget and damage your reputation.
This guide gives you everything you need to make an informed decision before you spend a penny.
Native vs Cross-Platform: Making the Right Choice
Native (Swift/Kotlin)
- Best performance and access to all platform APIs
- Ideal for apps with complex animations, AR, or hardware integrations
- Higher cost — you are essentially building two apps
- Longer time to market
Cross-Platform (React Native / Flutter)
- Single codebase for iOS and Android — typically 40–60% cost saving vs native
- Faster time to market
- Excellent performance for 90% of use cases
- Nexith’s preferred choice for most UK SME and start-up projects
UK Market Considerations
- UK Data Protection Act 2018 and UK GDPR: Any app collecting personal data from UK users must comply.
- Payment regulations: UK financial apps must work with Open Banking standards and comply with FCA guidelines where applicable.
- Accessibility: The Equality Act 2010 applies to all consumer-facing apps.
- App Store localisation: UK English spelling, British date formats (DD/MM/YYYY), and currency (£) must be correct throughout.
How Much Does App Development Cost in the UK?
- MVP / Simple App (up to 5 screens): £15,000 – £35,000
- Mid-complexity App (user accounts, API integrations, push notifications): £35,000 – £80,000
- Complex App (real-time features, AI, payments, custom backend): £80,000 – £200,000+
The Build Process: What to Expect
Phase 1: Discovery (2–3 weeks)
User research, competitive analysis, defining core features, and creating a technical specification. This phase is critical and often skipped by cheaper agencies — to your detriment.
Phase 2: Design (3–5 weeks)
Wireframes, interactive prototypes, and high-fidelity UI designs. User testing should happen here, not after development begins.
Phase 3: Development (8–20 weeks)
Agile sprints, typically 2 weeks each, with a working, testable build at the end of every sprint.
Phase 4: QA and Testing (2–4 weeks)
Functional testing, performance testing, security testing, and App Store review preparation.
Phase 5: Launch and Post-Launch (ongoing)
App Store submission, marketing support, crash monitoring, and iterative updates based on user feedback.
Choosing the Right UK App Development Partner
Ask any prospective agency these questions:
- Can you show us three live apps you have built and their App Store reviews?
- Who will actually be building our app — in-house developers or subcontractors?
- How do you handle intellectual property — will we own all code and assets?
- What does your post-launch support model look like?
- Have you worked in our industry before?
Nexith builds mobile applications for UK businesses using React Native and Flutter, with in-house designers and engineers based in the UK. Talk to us about your app idea today.