Top Web App Development Agencies in The United Kingdom

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Top Featured Web App Development Agencies

Duck.design
4.7
(29 reviews)
You need design done. Just get it!
Recommended
Top awarded
Your brand designs are too important to be left in the hands of unreliable freelancers or expensive creative agencies. Why not hire an experienced, full-time designer who knows you by name and your brand by heart? Since its creation, Duck.design has been able to capitalize on a number of areas that currently constitute its strength: - Logo, Brand Guide, Style Guide; - Graphic Design; - Web Design; - UI/UX Prototyping; - 3D Design; - Game design; - Explainer Video, 2D Animation, GIF.
Looking for work in Web Application
Located in Greater London, United Kingdom
Budget on request
Worked in Banking & Financials (+8)
Speaks English
51-200 members
AGCS Works
4.8
(36 reviews)
Marketing - Design - Social Media - Video Production
Recommended
Top awarded
We are an award-winning international digital agency. Our key areas of focus are: - Marketing and Marketing Strategy - Social Media - Design and Digital Design - Video Production and Editing - Web Development - Branding and visual identity - Digital design - HTML5 coding and Banners We have worked with clients including Yamaha, Universal Pictures, Ubisoft, Qatar Airways, and Samsonite, as well as top creative agencies across the UK, Europe and United States. Our team of designers, video editors and web development specialists helps brands and creative agencies execute flawless design and digital production projects.
10 works in Web Application
Located in London, United Kingdom (+1)
From €1,000 for Web Application
Worked in Accounting (+16)
Speaks English
11-50 members
TESIBY
5
(2 reviews)
Senior engineers for SaaS, AI & custom software.
Recommended
We’re a senior software development team building SaaS products, AI-powered applications and custom web platforms. We work with startups, established businesses and agencies that need an experienced technical team to take ownership of a product, a feature set or a difficult integration. Our core stack includes Laravel, PHP, Vue/Nuxt and modern cloud infrastructure. We handle architecture, backend and frontend development, APIs, third-party integrations, automation and AI-assisted workflows. We can join an existing codebase or build a focused product from scratch. We also build and run our own SaaS products, Contalys (AI accounting automation) and Grantium (EU funding applications), so we know what production software demands. We intentionally keep the team small and senior: direct communication, practical technical decisions and reliable delivery without unnecessary layers of account management.
5 works in Web Application
Located in Bucharest, Romania
From €1,000 for Web Application
Worked in Accounting (+3)
Speaks English, Romanian(+1)
1-10 members
The Weather
4.9
(45 reviews)
No-nonsense digital transformation for forward-thinking brands
Highly recommended
Top awarded
🇬🇧 The Weather is an award-winning digital agency and one of Germany's top-ranking companies for web design and web development. We design, build and brand — websites, digital products and AI applications — for companies that expect results. Based in Berlin, delivering worldwide. We have created over 200 websites for tech startups, green energy clients, democracy-focused NGOs, and progressive brands. Their digital transformation has paid for itself — and yours should too. The Weather is the #1 web design company in Germany on Clutch. Seven of our websites received nominations on Awwwards.com. Our web experiences change entire businesses, one website at a time. See the proof. Web design Our high-impact design websites and digital experiences are designed to spark action and build momentum. Discovery & digital advisory Websites UI/UX Figma Web apps Mobile apps Motion design 3D animations Web development We develop future-proof websites and software that are result-oriented and easy to live with. WordPress and Elementor Webflow Jamstack, Headless CMS Mobile apps Web apps Support and maintenance Brand construction With a strong focus on storytelling, we craft distinctive brand and product identities that stand out. Brand guidelines Brand book Idea making Copywriting Illustration Graphic and print design AI development We turn AI from a buzzword into a business asset — practical products built from scratch or integrated into what you already have. AI product strategy & scoping — defining the right problem before a line of code is written AI agents — autonomous agents handling complex, multi-step tasks LLM integration — reliable, scalable integration into existing products and workflows Prototyping & proof of concept — fast, focused builds to test core assumptions Prompt engineering & workflow design — prompts and pipelines that perform in production AI product development — end-to-end, in-house; our own product, Oylo, is proof
10 works in Web Application
Located in Berlin, Germany
From €5,000 for Web Application
Worked in Energy & Oil (+25)
Speaks English, Catalan(+7)
11-50 members
U1CORE
4.9
(18 reviews)
PARTNER IN CRIME FOR STRONG BUSINESSES. Websites · Branding · Software
Highly recommended
Top awarded
Websites · Branding · Software Website: https://www.u1core.com/ Book a call: https://calendly.com/hello-u1core/30min Most companies outgrow their digital before they notice. The business is strong, the team is good, the product works. But the website is still the first version, operations still live in spreadsheets, and the brand says nothing a competitor couldn't say. That's where we come in. WHAT WE DO · Websites — marketing sites, landing pages and platforms that sell before your team has to · Branding — identity and design systems that position you at the level you actually operate at · Software — web and mobile products, internal tools and operational systems that replace manual work WHY ONE TEAM Brand agencies do brand. Product studios do product. Outsourcing firms write code. The real problems sit between those disciplines — which is why we do all of it, under one contract, with one person accountable for the result. WHO WE WORK WITH Companies with real revenue and a team in place: founders and owners scaling past their first system, operators rebuilding for growth, and businesses entering a new market. WHERE WE'VE PROVEN IT $720M+ processed through a platform we built. Classified marketplaces with millions of listings. Trading exchanges and auction systems running in production. SaaS, fintech and marketplace products across 40+ projects. HOW WE START With a diagnostic, not a proposal. We look at your website, brand and operations, show where you lose trust, traffic and time — and what to fix first. LET'S TALK IF your business is strong but your website, brand or operations don't play at the same level yet.
1 work in Web Application
Located in London, United Kingdom
From €10,000 for Web Application
Worked in Banking & Financials (+18)
Speaks English
11-50 members
Cab Engine | Digital Agency
4.9
(5 reviews)
We specialise in building high-performance teams to power your entire marketing engine.
Recommended
A trusted UK agency of 20 years, our unique partnership model has been the foundation for our client's success. Working with brands all over the world, our dedicated digital teams have driven significant results for our clients tech platforms and performance marketing.
4 works in Web Application
Located in Warwickshire, United Kingdom
From €30,000 for Web Application
Worked in Others (+8)
Speaks English
11-50 members
GRM Digital
5
(5 reviews)
Digital marketing and technology that drives measurable growth.
Top awarded
GRM Digital is an award-winning digital agency helping ambitious businesses generate sustainable growth through SEO, paid media, content, digital strategy and technology. Since 2009, we've worked with organisations to improve their digital visibility, attract the right audiences and turn digital activity into measurable commercial results. Our marketing capabilities include SEO, PPC and paid search, content strategy and creation, digital PR and authority building, analytics, conversion optimisation and wider digital marketing strategy. We don't treat these channels in isolation. Our teams combine marketing expertise with UX, data, design and technology to understand the complete customer journey, from how prospects discover your business through to how they engage, convert and become customers. For organisations looking for an ongoing digital marketing partner, we develop integrated strategies based around clear commercial objectives. This includes understanding your market and competitors, identifying growth opportunities, building the right channel strategy and continuously measuring and improving performance. Unlike agencies focused purely on marketing activation, GRM also has extensive technical expertise across websites, CMS, eCommerce and digital platforms. This allows us to identify and solve the technical, UX and performance issues that can limit marketing results. Whether you need to increase organic visibility, improve paid search performance, create better content, generate more qualified enquiries or build a long-term digital growth strategy, GRM provides the strategy, expertise and ongoing optimisation needed to deliver measurable growth.
3 works in Web Application
Located in West Yorkshire, United Kingdom (+4)
From €20,000 for Web Application
Worked in Education (+6)
Speaks English, Croatian(+2)
11-50 members
Rounded Labs
5
(1 review)
Building mobile apps since before the iPhone
Founded in 2007, Rounded Labs has been at the forefront of mobile software for nearly two decades. We developed the UK’s first mobile banking app and went on to build some of the earliest m-commerce apps on the UK App Store for brands including GAME, Gamestation, Waterstones, HMV and Next. Since then, we’ve designed and developed software across virtually every major industry: From retail, fintech and SaaS to logistics, enterprise platforms and public-sector projects, including work for the Bavarian Government. Today, we bring that same depth of experience to ambitious businesses looking to build, modernise or rescue complex digital products. Nearly 20 years of experience. Some of the UK’s earliest mobile apps. Still building what comes next.
4 works in Web Application
Located in Birmingham, United Kingdom
From €10,000 for Web Application
Worked in Banking & Financials (+6)
Speaks English
11-50 members
Instinctools
5
(10 reviews)
Your AI-powered Engineering Partner
Top awarded
Meet *instinctools - a global AI-powered software engineering company with over 25 years of experience. We help both SMBs and Enterprises build robust, scalable software solutions that excel in functionality and design. Our core services include: Agentic AI enablement Custom software development enhanced by deep AI expertise Digital product engineering Business process automation Legacy system modernization Advanced data analytics and visualization Cloud infrastructure and DevSecOps Headquartered in the USA (Maryland) and Europe (Germany), *instinctools offers convenient locations for meeting and collaborating directly with our clients. We have development centers in Poland, LATAM, India, and Kazakhstan that combine global expertise with a strong price-quality balance to ensure exceptional results across time zones. Our work is backed by ISO-certified quality standards, strategic partnerships with leading tech platform, and a long-standing commitment to engineering excellence. Instinctools holds a broad portfolio of regional and industry-specific certifications, including CIR, HIPAA, and other compliance frameworks required for regulated markets. The 2025 Annual Customer Satisfaction Index is 9.1 out of 10.
3 works in Web Application
Located in London, United Kingdom (+4)
From €10,000 for Web Application
Worked in Construction (+10)
Speaks English, German(+1)
201-500 members

All Web App Development Companies in The United Kingdom

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