(Web App Development)
Custom web applications
built around
your business.
WebAnts is a London web app development agency building bespoke web applications, SaaS platforms, and internal tools, from MVP to production-grade, with auth, billing, and everything in between. No prepayment required.
Free quote
Tell us about your
web app project.
Flat written quote, same day.
What we do
WebAnts is a London web design and development agency specialising in custom web application development. We build bespoke SaaS platforms, internal tools, and client portals for businesses that have outgrown off-the-shelf software.
TypeScript throughout. Clean architecture. Tests as a deliverable, not an afterthought. No offshoring, no prepayment, no account-manager ping-pong.
100+
projects shipped
1.8×
faster than industry average
4.9★
rated on Google, Clutch & Upwork
£0
deposit, milestone payments only
Web app services
Eight types of web app.
All built in-house.
01
SaaS Platform Development
End-to-end SaaS builds with user auth, Stripe billing, team management, role-based access, and the admin dashboard your support team needs from day one.
02
Internal Business Tools
Replace spreadsheets and disconnected apps with a custom internal tool, data entry forms, approval workflows, reporting dashboards, and integrations with your existing systems.
03
Client Portals
Branded portals where your clients log in, view project status, download documents, raise tickets, and communicate with your team, white-labelled to your brand.
04
Workflow Automation Tools
Web apps that replace manual processes, form submissions trigger emails, Slack messages, database updates, and third-party API calls automatically, without Zapier limits.
05
Data Dashboards & Reporting
Real-time dashboards pulling from multiple data sources, Stripe, your database, Google Analytics, Airtable, visualised clearly for the decision-makers who need them.
06
Multi-tenant Applications
Web apps serving multiple organisations from a single codebase, isolated data per tenant, per-tenant billing, and role-based access for each organisation's team.
07
Integration Platforms
Connect two or more third-party services with custom logic that Zapier can't handle, field mapping, error handling, retry logic, and a full audit log.
08
Legacy App Modernisation
Rebuild a slow, outdated web app with a modern stack, without losing data, institutional knowledge, or your users. Migration handled safely with zero downtime.
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
What you get
Deliverables
- ↳Source code on GitHub, fully owned by you
- ↳TypeScript throughout
- ↳Figma design files
- ↳Unit and integration test suite
- ↳CI/CD pipeline (GitHub Actions)
- ↳Docker setup for local development
- ↳User and admin documentation
- ↳Two weeks post-launch support
Toolkit
- React
- Next.js
- TypeScript
- Node.js
- PostgreSQL
- Supabase
- Stripe
- Auth0 / Clerk
- Prisma
- Redis
- Vercel
- AWS
- Figma
- Zod
Who we build for
Web apps for every
type of business.
Logistics & Operations
Education & EdTech
Client feedback
“WebAnts built something better than I’d ever imagined, shipped faster than any agency I’ve worked with.”
FAQs
Common
questions.
How long does a custom web app take to build?
A focused MVP with a single core workflow typically takes 6–10 weeks. A full-featured platform with auth, billing, admin tooling, and integrations takes 12–20 weeks. We'll scope the timeline honestly on the discovery call, and we deliver 1.8× faster than the industry average.
What's the difference between a web app and a website?
A website is primarily informational, people read it. A web app is interactive, people use it to do something: log in, manage data, process payments, or automate a workflow. Most of what WebAnts builds sits on the web-app end of this spectrum.
How much does custom web app development cost?
A focused internal tool or client portal typically starts from £10,000. A full SaaS platform with auth, billing, admin, and a marketing site starts from £25,000. These are flat-quote projects, no hourly estimates, no surprises.
Do you build from scratch or use existing frameworks?
We build on proven frameworks, Next.js for the front end, Node.js or NestJS for the back end, PostgreSQL for the database. We don't reinvent the wheel, but we don't use low-code tools that limit what you can build. Everything is custom-coded and fully owned by you.
Can you build a web app that connects to our existing systems?
Yes. We integrate with any system that has a REST API, GraphQL API, or webhook capability, Salesforce, HubSpot, Xero, QuickBooks, Google Workspace, Slack, and hundreds of others. We also integrate with legacy systems via SFTP, CSV import, or direct database connections where needed.
Do you offer post-launch support?
Yes. Every project includes two weeks of post-launch support. After that, we offer ongoing support on an as-needed basis or a monthly retainer, bug fixes, new features, performance optimisation, and infrastructure management. No lock-in.
Get started
Ready to build your
web application? →
Free 30-minute discovery call. Flat written quote. No prepayment.
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 Custom Web App Development
WebAnts is a London web development agency specialising in custom web application development. Services: SaaS platforms, internal tools, client portals, workflow automation, data dashboards, multi-tenant apps, integration platforms, and legacy modernisation. TypeScript throughout. 4.9★ Google, 5.0 Clutch. London, UK. No deposit.