(React Development London)
React & Next.js
websites built
for performance.
WebAnts is a London React development agency building custom React apps, Next.js marketing sites, SaaS dashboards, and Shopify Hydrogen stores — delivered 1.8× faster, no prepayment required.
Free quote
Tell us about your
React project.
Flat written quote, same day.
What we do
WebAnts is a London React development agency specialising in React 19 and Next.js 15. We build custom React applications, Next.js marketing sites, and SaaS dashboards for startups, SMEs, and agencies across London and worldwide.
TypeScript as standard. No offshoring, no prepayment, and no account-manager layers — you work directly with the React developer building your product, from first wireframe to final commit.
100+
React & Next.js projects shipped
1.8×
faster than industry average
4.9★
rated on Google, Clutch & Upwork
£0
deposit — milestone payments only
React services
Everything React,
done properly.
Twelve React and Next.js services, from a fast marketing site to a full SaaS platform — all built in-house in London.
01
Custom React Applications
Full-stack React apps with authentication, complex state management, and real-time data. Built with Next.js for SEO, performance, and edge delivery. TypeScript throughout.
02
Next.js Marketing Sites
Server-rendered marketing sites with outstanding Core Web Vitals, structured data, and built-in sitemaps. Ranking-ready from day one — not bolted on afterwards.
03
SaaS Dashboards & Portals
Data-rich dashboards, admin panels, and client portals with real-time updates, role-based access, Stripe billing, and Supabase or Prisma backends.
04
React + Headless CMS
Next.js front end connected to Sanity, Contentful, Storyblok, or WordPress as a headless CMS — so your marketing team publishes without touching code.
05
Shopify Hydrogen & Headless Ecommerce
Blazing-fast headless storefronts with React and Shopify Hydrogen. Full custom design, faster load times, and complete freedom from theme constraints.
06
API Integration & Backend Connectivity
Connect your React app to Stripe, Supabase, Airtable, Salesforce, or any REST/GraphQL API. Type-safe, documented, tested, and maintainable.
07
React Performance Optimisation
Bundle analysis, lazy loading, caching strategies, and Core Web Vitals auditing for existing React apps that have grown slow or missed their Lighthouse targets.
08
React Migration
Moving from legacy jQuery, Vue, or Angular to a modern React/Next.js stack — without downtime, without losing SEO equity, and with full test coverage on delivery.
09
React Native & Hybrid Mobile Apps
Cross-platform iOS and Android apps that share up to 80% of codebase with your React web app. One team, one design language, one delivery timeline.
10
Design Systems & Component Libraries
Storybook-documented, reusable component libraries built to your brand. Keeps product UI consistent across teams, products, and time — no more one-off component sprawl.
11
TypeScript Refactoring
Adding TypeScript to an existing JavaScript React codebase for better reliability, autocomplete, and long-term maintainability. Incremental or all-at-once.
12
Accessibility & WCAG Compliance
WCAG 2.2 AA-compliant React builds with keyboard navigation, screen reader support, colour contrast verification, and an accessibility audit report on delivery.
React vs alternatives
React / Next.js vs
WordPress, Webflow & Framer.
The right technology depends on what you actually need to build. Here is how React and Next.js compare to the alternatives most London businesses consider.
| Criteria | React / Next.js | WordPress | Webflow | Framer |
|---|---|---|---|---|
| SEO capability | Excellent (Next.js SSR) | Good (plugin-dependent) | Good | Good |
| Performance ceiling | Excellent — sub-2s LCP | Moderate (needs work) | Good | Good |
| Customisation | Unlimited | High (with plugins) | Medium | Medium |
| Content editing | Via headless CMS | Built-in | Built-in | Built-in |
| Complex logic / auth / billing | Native | Plugin-reliant | Very limited | Not supported |
| Scalability | Enterprise-grade | Plugin-limited at scale | Platform capped | Platform capped |
| Best for | Apps, SaaS, fast sites | Blogs, marketing sites | Marketing, portfolios | Portfolios, landing pages |
From idea to live site in four steps.
Milestone payments — you see progress weekly and own every deliverable the moment it's completed.
Discovery Call & Flat Quote
Every project starts with a free 30-minute call — no pitch deck, no jargon. We ask the right questions about your goals, your audience and your budget, then deliver a written flat-fee proposal within 24 hours. You know the full cost before we touch a single wireframe.
- Free 30-minute strategy call
- Digital brief and business goal analysis
- Written flat-fee quote within 24 hours
- No hourly rates, no scope creep surprises
- Platform and technology recommendation included
Our stack
The exact tools we
build with.
No vague "modern technologies" promises. Here is our current production stack, by category.
Core
- React 19
- Next.js 15
- TypeScript 5
- Vite (SPAs)
UI & Styling
- Tailwind CSS
- Radix UI
- Shadcn/ui
- Framer Motion
State & Data
- Zustand
- TanStack Query
- React Hook Form
- Zod
Testing
- Vitest
- React Testing Library
- Playwright
- Storybook
Backend & Auth
- Supabase
- Prisma + PostgreSQL
- tRPC
- Clerk / NextAuth
Payments & CMS
- Stripe
- Sanity
- Contentful
- Storyblok
Deployment
- Vercel
- Netlify
- AWS
- Docker + CI/CD
Ecommerce
- Shopify Hydrogen
- WooCommerce (headless)
- Stripe Commerce
Indicative costs
What does a React
project cost in London?
Ballpark budgets and timelines per project type. Every project gets a flat written quote after a free 30-min discovery call — no hourly estimates, no surprises.
| Project type | Typical budget | Typical timeline |
|---|---|---|
| Next.js marketing site | From £3,000 | 2–3 weeks |
| React SaaS dashboard | From £8,000 | 4–8 weeks |
| Full-stack web application | From £15,000 | 8–16 weeks |
| Shopify Hydrogen store | From £6,000 | 3–5 weeks |
| React Native mobile app | From £12,000 | 6–12 weeks |
| React migration (legacy) | From £5,000 | 3–6 weeks |
Costs are guides. Actual quotes depend on scope, integrations, and complexity confirmed on the discovery call.
What you get
Every project delivers
- ↳Source code on GitHub — you own it fully
- ↳TypeScript throughout, no exceptions
- ↳Figma design files included
- ↳Core Web Vitals pass (LCP < 2.5s)
- ↳Unit, integration & E2E test suite
- ↳CI/CD pipeline via GitHub Actions
- ↳Vercel / Netlify deployment configured
- ↳WCAG 2.2 AA accessibility checked
- ↳Two weeks post-launch support
Full toolkit
Core
UI & Styling
State & Data
Testing
Backend & Auth
Payments & CMS
Deployment
Ecommerce
Who we build for
React for every
type of business.
Media & Publishing
Internal Tooling
FAQs
Common
questions.
React or Next.js — which do you use?
We default to Next.js for almost every project because it gives you React plus server-side rendering, file-based routing, API routes, and edge delivery in one framework. For internal tools or SPAs with no SEO requirement, plain React (Vite) is more appropriate. We'll recommend the right choice on the discovery call.
React vs WordPress — which is right for my project?
WordPress wins for content-heavy sites where a non-technical team publishes frequently and SEO is the primary goal. React/Next.js wins when you need custom functionality, a fast load time that WordPress plugins can't achieve, Stripe billing, user authentication, or a design that's genuinely custom. For most SaaS products, dashboards, and agencies that care about Core Web Vitals, React with Next.js is the better foundation.
React vs Webflow or Framer — what's the difference?
Webflow and Framer are visual builders — fast to launch for a marketing site, but you hit a ceiling quickly. They don't support custom backend logic, real-time data, auth, billing, or headless APIs without hacks. React/Next.js has no ceiling: you build exactly what you need. The trade-off is that React requires a developer, whereas Webflow does not. If your site needs more than content and visuals, React is the right choice.
Do you build SPAs or server-rendered apps?
Both. We use Next.js App Router for server-rendered sites where SEO and Core Web Vitals matter. For dashboards, portals, and internal tools where SEO is irrelevant, we build client-side SPAs.
Can you work with our existing React codebase?
Yes. Whether you need new features added, a performance overhaul, a TypeScript migration, or a refactor of legacy code, we can work within your existing repo and coding standards. We'll do a codebase audit before quoting.
Do you build React Native mobile apps?
Yes. React Native lets us share up to 80% of codebase with an existing React web app, which significantly reduces cost and delivery time for clients who need both. We build cross-platform iOS and Android apps with React Native, using Expo for most projects and bare React Native when deeper native access is required.
What accessibility standards do you build to?
We build to WCAG 2.2 Level AA as standard on all new React projects. This includes keyboard navigability, screen reader support (tested with VoiceOver and NVDA), colour contrast ratios meeting 4.5:1, and descriptive ARIA labels. We deliver an accessibility audit report alongside each project.
How much does a React project cost?
A Next.js marketing site starts from around £3,000. A SaaS dashboard with auth, billing, and data layers typically starts from £8,000. A full-stack web application starts from £15,000. A React Native mobile app from £12,000. We provide a flat written quote after a free discovery call — no hourly estimates.
How do you test React applications?
We write unit tests with Vitest and React Testing Library, integration tests covering user flows, and end-to-end tests with Playwright for critical paths. Every project ships with a test suite, a passing CI run, and documentation on how to run and extend the tests.
Do you set up CI/CD and deployment?
Yes. Every project ships with a GitHub Actions workflow, Vercel (or your preferred host) deployment, branch preview environments, and environment variable management baked in from day one.
React vs Vue vs Angular — which framework should I choose?
React is our default recommendation because of its large ecosystem, first-class TypeScript support, and Next.js on top of it. Vue is a strong alternative for smaller projects or teams with a PHP/backend background. Angular suits large enterprise teams who want strict conventions from a Java or C# background. For most London startups and SMEs, React with Next.js gives the best balance of hiring pool, performance, and tooling.
Is React good for SEO?
Plain client-side React (a single-page app) is poor for SEO because search engines receive an empty HTML shell and must execute JavaScript to see content. This is why we use Next.js for all public-facing React projects — Next.js renders pages server-side, giving Google clean HTML to index immediately. For dashboards and portals with no public SEO requirement, plain React is perfectly suitable.
What is the typical architecture for a React SaaS application?
Our standard SaaS stack is: Next.js App Router (frontend and API routes), Supabase (PostgreSQL database and auth), Stripe (billing), and Vercel (deployment). For larger platforms with more complex data requirements, we use Prisma with a dedicated PostgreSQL instance and Clerk for authentication. We tailor the stack to your project complexity, team size, and budget.
Related services
You might also need
Get started
Ready to build your
React project? →
Free 30-minute discovery call. Flat written quote. No prepayment. You work directly with the developer building your product.
WebAnts Ltd · London, UK · hello@webants.io · +44 20 3983 9795
Client stories
4.9★ across Google, Clutch & Upwork. 100+ projects. 14 countries.
“WebAnts built something better than I'd ever imagined — shipped faster than any agency I've worked with.”
LaTisha Ebanks North Pointe Marketing
Dr. Nadish Ravindran
Founder · Elite Scholars
“The team were methodical, fast and honest. Exactly what we needed. No surprises, just results.”
Guillaume Etlin Bro Bread
“We ranked #1 in three London postcodes within 90 days of launching with WebAnts. The ROI has been remarkable.”
Ahmed Hassan Papa Doner
Rachel Piccoli
Founder & CEO · Humming Bliss Acres
“WebAnts delivered our marketing site faster than any agency we'd worked with before. Clean build, great communication throughout.”
Patrick Bishop ReRoute Americas
“Incredible attention to detail. The site launched under budget and our leads doubled in the first month.”
Tom Walker Access Super
“WebAnts built something better than I'd ever imagined — shipped faster than any agency I've worked with.”
LaTisha Ebanks North Pointe Marketing
Dr. Nadish Ravindran
Founder · Elite Scholars
“Incredible attention to detail. The site launched under budget and our leads doubled in the first month.”
Tom Walker Access Super
“The team were methodical, fast and honest. Exactly what we needed. No surprises, just results.”
Guillaume Etlin Bro Bread
“We ranked #1 in three London postcodes within 90 days of launching with WebAnts. The ROI has been remarkable.”
Ahmed Hassan Papa Doner
“WebAnts delivered our marketing site faster than any agency we'd worked with before. Clean build, great communication throughout.”
Patrick Bishop ReRoute Americas
Rachel Piccoli
Founder & CEO · Humming Bliss Acres
Verified ratings
About WebAnts React Development Agency London
WebAnts is a London React development agency specialising in React 19 and Next.js 15. Services include custom React applications, Next.js marketing sites, SaaS dashboards, Shopify Hydrogen headless ecommerce, React Native mobile apps, design system development, WCAG accessibility compliance, headless CMS builds (Sanity, Contentful, Storyblok), API integration, React performance optimisation, React migrations, and TypeScript refactoring. WebAnts is rated 4.9 stars on Google, 5.0 on Clutch, and 5.0 on Upwork. Top Web Designers 2025 on DesignRush. Based in London, UK. No deposit required. Milestone payments only.
WebAnts builds React applications for SaaS startups, fintech companies, law firms, estate agents, dental practices, ecommerce brands, and agencies requiring white-label React development. TypeScript is standard on all projects. WCAG 2.2 AA accessibility is included. Every project ships with a test suite, CI/CD pipeline, and Vercel deployment.