App developer UK —
web and mobile specialists
Mantar Tech is a UK-registered app development team. We build web apps, iOS apps and Android apps for businesses across the UK — all at fixed prices, with a structured delivery process and a free initial consultation.
Web app developer or mobile app developer?
The right answer depends on your users, not your preference. Here's a quick guide.
Web App Developer
Build apps that run in a browser — no App Store required. Ideal for B2B tools, internal dashboards, SaaS platforms and customer portals.
- Works on any device, any browser
- No App Store approval process
- Faster to launch and update
- Usually lower initial cost
- Best for: B2B tools, admin panels, SaaS
Mobile App Developer
Build apps distributed via the App Store and Google Play — installed on users' phones. Right for consumer-facing products, field tools or apps needing device features.
- Native device features (camera, GPS, push)
- Works offline
- Higher user trust + discoverability
- Cross-platform: iOS + Android in one build
- Best for: consumer apps, field tools, marketplaces
What UK app developers should use in 2026
Web: React + Next.js
The UK's most in-demand web app stack. Excellent for SEO, fast rendering, and long-term maintainability. We use TypeScript as standard.
Mobile: React Native
One codebase, iOS + Android. Lower cost, faster updates, and production-grade for most business apps. We use Expo for managed workflow.
Backend: Node.js + PostgreSQL
Reliable, scalable API layer. Pairs cleanly with React front-ends. We deploy on AWS, GCP or fly.io depending on scale requirements.
How much does a UK app developer cost?
We work fixed-price. You know the total cost before we start — no hourly billing, no scope creep surprises.
MVP
£8,000–£20,000
8–12 weeks
Web or mobile app
Core features only, fast to market
Business App
£25,000–£60,000
14–20 weeks
Full platform with integrations
SaaS, dashboards, portals
Enterprise Platform
£60,000+
6–12 months
Complex systems, marketplace, ERP
Dedicated team
UK app developer — common questions
Should I hire a freelance app developer or an agency?
Freelancers are cheaper but carry risk — if they're unavailable, sick or leave, your project stalls. A small agency like Mantar Tech gives you a team (designer, developer, QA) with one point of contact, fixed pricing and guaranteed continuity. Better for anything over £15,000.
Can I start with an MVP and expand later?
Yes — and we'd recommend it. Most successful UK apps start with a focused MVP (8–12 weeks, £8–20K), validate with real users, then expand. We plan MVPs with scalability in mind so Phase 2 isn't a rebuild. We have clients who've taken apps from £12K MVP to £100K+ platforms over 2 years.
Do you own the code or do I?
You own 100% of the code, IP and all assets. On final payment, we provide the complete repository and all credentials. No lock-in, no recurring licensing fee for code we wrote. You can take it to any developer in the future.
What's your development process?
Discovery → Design → Development sprints (2 weeks each) → Testing → Launch → 30-day support. You see working software every 2 weeks — not a 6-month blackbox followed by a big reveal. We use Figma for designs you can comment on directly and Linear for project tracking.
Before you hire an app developer
Web App vs Mobile App
Which type of app developer do you actually need? Answer this first.
Read guide →App Costs UK 2026
Realistic cost tables for every size of project in the UK market.
Read guide →How to Build an MVP
What to build first, what to cut, and how to get to market in 10–16 weeks.
Read guide →