Web app development agency UK
Web apps that feel instant.
Slow, clunky web apps lose users in seconds. We build fast, accessible, beautiful web applications on the modern stack — the kind that load instantly, rank well and feel premium on every device, because the experience is the product.
Web app development problems we fix.
Your current web app is slow, and you can feel users bouncing.
We build on a modern, server-first stack tuned for Core Web Vitals — instant loads, smooth interactions, no jank.
It looks dated and doesn't match the quality of your product.
We design and build a premium, modern experience that earns trust the moment someone lands.
Google can't see it and it doesn't show up in search.
Server-side rendering, clean semantics and structured data baked in, so the app is fast, crawlable and ready to rank.
Our web app development services.
Modern, server-first builds
Next.js and React on the App Router — server components, streaming and edge rendering for speed that holds under load.
Premium, accessible UI
Design-system-driven interfaces that look expensive, work on every screen and meet accessibility standards by default.
SEO & performance
Core Web Vitals, structured data and clean URLs engineered in — so the app is fast and ready to be found.
Customer portals & dashboards
Logins, accounts, live data and reporting your customers use every day: fast, secure and simple to run.
Internal tools & admin panels
Replace spreadsheets and copy-paste with a web app your team actually likes: workflows, roles, approvals and audit trails.
Integrations & data
Payments, auth, CMS and the APIs your app depends on, wired in cleanly and reliably.
What you get from our web app development.
- A fast, modern web app live in production
- Top-tier Core Web Vitals scores
- A premium experience on every device
- Search-ready structure baked in
Our web app development stack.
Web app development questions, answered.
How much does a web app cost to build?
Web app projects at Softgen start from £15,000 and scale with scope. We give you a fixed price after a short discovery, so there are no surprises.
What stack do you build web apps on?
Primarily Next.js, React and TypeScript on a server-first architecture, with Tailwind for the UI — the same stack the best modern products are built on.
How long does it take to build a web app?
Most first releases are live in 4–8 weeks after a Discovery Sprint of 1–2 weeks, with working software in your own environment every week.
What's the difference between a website and a web app?
A website mainly shows information. A web app lets people do things: log in, manage data, pay, book or work together. We build web apps, and the fast marketing sites around them.
Why hire a web app development agency instead of a freelancer?
An agency gives you a whole senior team (design, front end, back end and DevOps) with one fixed price and date, and no single point of failure. You still own all the code.
Can you redesign or rebuild our existing web app?
Absolutely. We can rebuild from scratch or modernise in place, starting with an audit so you know the trade-offs before we begin.
Know before you build.
How much does it cost to build an app in the UK in 2026?
A UK studio build in 2026 runs from £15,000 for a focused web app to £250,000 for a full SaaS platform. Here are Softgen's real ranges by app type, what moves the number, and the running costs people forget.
Read the guide AI · 6 min readVibe coding vs production software: when your AI-built app needs engineers
AI app builders and vibe coding are brilliant for prototypes. Here's exactly where they break when real users arrive — and the fastest way to turn a vibe-coded app into production software.
Read the guide App Building · 10 min readHow to add LLM features to your existing app
Your app already works. Adding AI that makes it noticeably better is the hard part. Here's the exact playbook we use to wire in agents, copilots and RAG without turning it into a support nightmare.
Read the guide SaaS · 9 min readHow much does it cost to build a SaaS in 2026?
Most serious SaaS platforms cost £45,000–£250,000 to build. Here's what sets the number, the running costs founders forget, and how to launch a sharp v1 for less.
Read the guide AI · 8 min readHow to build an AI agent for your product
Most AI agents die in the demo. Here's how to build one that actually ships — the architecture, the evals, and the guardrails that keep it useful and safe.
Read the guide AI · 6 min readWhat is RAG? Retrieval-augmented generation in plain English
RAG lets an AI answer from your own documents instead of guessing. Here's how it works, when it beats fine-tuning, and what separates a demo from a production system.
Read the guideWhat we've built, and the calls to make first.
A support copilot that handled the questions humans shouldn't have to.
An in-product AI copilot, grounded in the company's own docs and ticket history, that resolved routine questions instantly and freed the team for the hard ones.
Read more Case study · FintechA fintech MVP — live, polished and raising in under two months.
A production-grade MVP that took a fintech founder from idea to real users and an investor-ready demo, without cutting the corners that come back to bite.
Read more Case study · E-commerceThree UK gift shops on one commerce engine, with 16,000+ products live.
Next Day Gifts, Holistic Tree and Your Personalised Gifts: three standalone UK shops, each with its own brand and storefront, all running on one headless commerce engine we built and run ourselves.
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WordPress runs much of the web; Next.js powers the fast, modern end of it. Here's a fair comparison on performance, SEO, security and flexibility.
Read more ComparisonSoftware agency vs freelancer vs in-house team
Should you hire a freelancer, build an in-house team, or work with an agency? Here's a fair comparison across the factors that actually decide it.
Read more ComparisonFixed-price vs time & materials
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AI & LLM Development
Launch and grow your SaaS
SaaS Product Development
Idea to launch in weeks
MVP Development
Ready when you are
Let's build the thing.
Tell us what you're building and we'll come back with a plan, a price and a date. No obligation, no jargon.