App development for UK startups.
MVP in 6–10 weeks.
Mantar Tech builds MVPs and startup apps for UK founders — fixed price, no equity, full code ownership. From idea to live product in weeks, not months. Free consultation, no commitment.
What kind of startup apps do we build?
Web App MVPs
SaaS dashboards, marketplace platforms, booking systems, B2B portals. Browser-first apps that can onboard users without app store approval.
Mobile App MVPs
iOS and Android apps using React Native or Flutter. Single codebase, near-native performance. Faster and cheaper than two separate native apps.
Full-Stack Products
Web frontend + mobile app + shared API backend. Ideal for startups building a two-sided marketplace, logistics product or service platform.
Integration-Heavy MVPs
Products that connect Stripe, Xero, Twilio, Google Maps, third-party data suppliers or industry-specific APIs from day one.
AI-Powered Features
LLM integrations (OpenAI, Claude), recommendation engines, smart search, document processing. AI features scoped carefully to avoid over-engineering.
Internal Tools
Operations dashboards, admin panels, workflow automation tools. Often the fastest way to validate a business idea before building a customer-facing product.
How we work with startups.
Scope the MVP ruthlessly
We help you cut the feature list to what actually needs to exist at launch. The goal is validation, not perfection. Everything else is Phase 2.
Fixed price, fixed scope
You get a detailed spec and a fixed price before we start. No hourly billing. No budget creep. No surprises at invoice time.
You own everything
100% of IP, source code and infrastructure transfers to you on delivery. No equity taken. Your cap table stays clean.
Staging access from week 1
You get a live staging URL from day one. Review builds as they happen. No waiting until the end to see what you paid for.
Launch-ready output
We deploy to production, configure your domain, set up monitoring and hand over documentation. The app is live and running — not just "done".
Phase 2 ready
Code is written to production standards from the start. When you're ready to scale after validation, Phase 2 won't mean rewriting everything.
Startup-friendly fixed pricing.
No equity. No surprises. All startup projects are quoted at a fixed price after a free scoping call.
Lean MVP
£8,000–£15,000
Core feature set on a single platform (web or mobile). Ideal for idea validation. Delivered in 6–8 weeks.
Full-Stack MVP
£18,000–£35,000
Web + mobile + backend API + 3rd-party integrations. For startups building a complete two-sided or multi-platform product. 8–14 weeks.
Growth Phase
£35,000+
Post-validation build-out: performance, scale, additional features, team onboarding. Scoped as a Phase 2 after successful validation.
Startup app development — common questions.
How much does a startup MVP cost in the UK?
A lean single-platform MVP costs £8,000–£15,000. A full-stack multi-platform MVP with backend and integrations costs £18,000–£35,000. All projects are fixed-price.
How long does an MVP take to build?
6–10 weeks for a lean MVP. 10–16 weeks for a full-stack multi-platform product. We confirm the exact timeline before work begins.
Do you take equity?
No. We work on fixed-price cash contracts only. No equity, no revenue share, no deferred payment. Your cap table stays clean.
What if I only have an idea — no spec yet?
That's fine. Our free consultation is designed exactly for this. We help you shape the idea, cut the scope to an MVP, and produce a clear spec and quote.
What tech stack do you use for MVPs?
For web: React / Next.js frontend, Node.js or Python backend, PostgreSQL database. For mobile: React Native or Flutter. All choices are made to maximise speed, not to lock you in.
Can I see examples of startup apps you've built?
Yes — visit our portfolio page. We've delivered a fitness app, a logistics tracker, a restaurant POS and more for UK-based founders.
More from Mantar Tech.
MVP Development Guide UK
Everything UK founders need to know about building, scoping and launching a minimum viable product.
Read guide → ServiceSaaS Development UK
Building a SaaS product? Multi-tenant architecture, subscription billing, scalable from day one.
Learn more → ServiceMobile App Development UK
iOS and Android app development for UK businesses and startups. React Native, Flutter, Swift, Kotlin.
Learn more →