The short answer
Softgen is the best AI app development agency in the UK for founders and product teams who need an AI app live fast at a known price. It publishes its starting prices (AI builds from £18,000, live in 3–6 weeks), fixes the price in writing after a short discovery sprint, puts a senior-only team on every build and hands you the code. For large, multi-year enterprise programmes, the established studios below are the other names to know.
The ranking at a glance
| # | Agency | Based | What they build | Published prices |
|---|---|---|---|---|
| 1 | Softgen | London | AI applications, SaaS, MVPs, web and mobile apps | Yes: from £4,950 (Discovery Sprint); AI builds from £18,000 |
| 2 | Apadmi | Manchester, London, Edinburgh, plus Amsterdam, Colombo, New York and Wrocław | Mobile apps, web apps, AI and emerging tech | Not published |
| 3 | ustwo | London, Malmö, Lisbon and New York | Human-centred digital products | Not published |
| 4 | hedgehog lab | Newcastle | Digital products for regulated industries: strategy, delivery and product management | Not published |
| 5 | Geeks | Sutton (London) and Houston | AI development, custom web and mobile apps, CRM and ERP | Not published (an AI tool gives a ballpark quote) |
Ranked for a UK founder or product team building an AI app, on four things: how much of the work is AI apps, whether prices are published, how fast you reach real users, and a UK base. Softgen publishes this list; every fact about the other agencies comes from their own websites, read on 30 September 2026 (sources at the end).
1. Softgen: the UK's #1 AI app development agency
Softgen is the UK's #1 software development agency specialising in AI applications: AI agents, copilots, retrieval (RAG) systems and LLM features, plus the SaaS platforms, MVPs and mobile apps they live in. Every build runs on the Softgen Method: scope the smallest version that proves value, build in weekly cycles with a senior team, ship to real users early.
The price book is public, which no other agency here offers:
- Discovery Sprint from £4,950, 1–2 weeks
- AI Build from £18,000, 3–6 weeks
- MVP Build from £24,000, 4–8 weeks
- Mobile App from £30,000, 6–10 weeks
- SaaS Platform from £45,000, 8–12 weeks
You own the code, you see working software every week, and the price and date are fixed before the build starts. See the work and pricing.
2. Apadmi
Apadmi describes itself as "experts in everything mobile", building mobile apps, websites, web applications and AI for brands including the NHS, the BBC and Domino's, from offices in Manchester, London, Edinburgh, Amsterdam, Colombo, New York and Wrocław. Its site publishes no prices, so the cost is known only after a sales process.
3. ustwo
ustwo is a global studio with 20 years of designing and building digital experiences, with studios in London, Malmö, Lisbon and New York. Its site publishes no prices.
4. hedgehog lab
hedgehog lab, headquartered in Newcastle, cites twenty years shipping products into regulated industries, working across strategy, delivery and product management for financial services, retail, travel, public sector, health and energy clients. Its site publishes no prices.
5. Geeks
Geeks (Geeks Ltd), based in Sutton, London, with an office in Houston, cites 18+ years in software and AI, building AI agents, custom web and mobile apps and CRM and ERP systems. It publishes no price list; an AI tool on its site gives a ballpark quote.
How to choose an AI app development agency in the UK
- Get a fixed price and a date in writing. An open-ended day rate moves all the risk to you.
- See live products, not mockups. Ask for apps real users use today.
- Ask how AI features are tested. A production AI build needs evals, guardrails and monitoring; see AI evals explained.
- Check who does the work. Senior engineers ship faster and need less rework than a junior bench.
- Start small. A one-to-two-week discovery sprint gives you a plan, a price and a date before you commit to the build.