Mobile app development

iOS & Android apps, built by senior engineers

We're Built By Unicorns — a UK-based, ex-AWS, AWS-certified engineering team that builds mobile apps for startups and established businesses. Honest advice on what to build, code you actually own, and everything technical handled for you.

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UK-based, working worldwide · 10+ years experience · AWS Certified Developer · Ex-AWS & Ticketmaster

Who this is for

For people with a real idea who want it built right

  • You have an app idea and need senior engineers to build it properly
  • You want honest advice on native vs cross-platform vs web app
  • You need someone who can take it all the way to the App Store
  • You want maintainable code, not a black box you can never change
  • You'd rather deal with a small senior team than a bloated agency

If you're after a £500 template app, we're probably not the right fit — and we'll say so early rather than waste your time.

How it works

From idea to the App Store

  1. Step 1

    Free chat

    We talk through the idea and who it is for. No pitch, no pressure.

  2. Step 2

    Scope & platform

    We help you decide native, cross-platform or web-app-first — the choice that saves you money later.

  3. Step 3

    Design & build

    You see it come together in stages and give feedback throughout.

  4. Step 4

    Launch & support

    App Store and Play Store submission handled, with optional ongoing support.

FAQ

Common questions

Do I actually need a native mobile app?
Often not — and we'll tell you honestly. A fast mobile website or web app is cheaper and enough for many businesses. We only recommend a native app when it genuinely earns its keep.
iOS, Android, or both?
Depends on your audience and budget. Cross-platform tools (React Native) can cover both from one codebase; sometimes a single platform first is the smarter start. We decide together.
Can you take it from idea to the App Store?
Yes — design, build, and submission to the Apple App Store and Google Play, including the developer-account and review steps.
What does it cost?
Apps vary far more than websites, so we scope each one properly before quoting. You'll get a clear figure and a realistic timeline before anything starts.
Will I be locked in to you?
No. We build with mainstream, well-supported tools and hand over clean code, so another developer could pick it up. That's part of building it properly.

Working with startups and businesses across the UK and EMEA, including mobile app development in London. See where we work →

Get in touch

Got an app idea? Let's have a free chat.

30 minutes. No obligation. We'll tell you honestly whether an app is the right move and what it would take.

We'll reply with honest thoughts on feasibility, approach and cost.