Web application development company
When a spreadsheet, an inbox and three logins have become the process, a small, well-built web app usually replaces all of them.
Web application development for UK businesses
As a web application development company, we build software that runs in the browser and does a specific job for your business. That might be a client portal where customers upload documents and approve work, an internal tool that replaces a fragile spreadsheet, a quoting system that prices jobs in seconds, or a dashboard that pulls figures from several systems into one view.
We build our own products this way. Adlogue is an ad intelligence web app that finds the Meta ads winning in a category and explains why. Adlette is an AI tool that generates UGC-style video ads for direct-to-consumer brands. We built and run both, so we know what it takes to keep a web app reliable, secure and useful once real people depend on it every day.
What we build
- Client portalsDocuments, updates and approvals in one place.
- Internal toolsReplace the spreadsheet everyone is afraid to touch.
- Booking & quotingLive availability and instant quotes.
- AI featuresSearch, summaries and assistants inside the app.
Custom web application development for real processes
Custom web application development makes sense when off-the-shelf software forces your team to work around it. We start by mapping the current process: who does what, where information is typed twice, and where things get missed. Then we agree the smallest version of the app that removes the most work. That version goes live first, and further features are added based on how people actually use it. This keeps the first release focused and gets value to your team sooner than trying to build everything at once.
- Client portals for documents, updates, approvals and invoices
- Internal tools for job tracking, scheduling and stock
- Booking and quoting systems with live availability and pricing rules
- Dashboards that combine data from your CRM, accounts and operations
Web application design people actually use
An internal tool that staff dislike quietly fails, because people drift back to the spreadsheet. Web application design focuses on the tasks people repeat most: fewer clicks to log a job, clear status labels, sensible defaults and search that finds a record by any detail. We test screens with the people who will use them and build responsive layouts, so the app works on an office monitor and a phone on site. Admin screens let your managers change prices, users and settings without asking a developer, and every important action is logged so you can see who changed what.
Bespoke and enterprise web application development
Some applications need more than a database and a few forms. Our team built Atelic, enterprise AI applications for complex industrial operations, so we are used to role-based permissions, audit trails, integrations with existing systems, and AI features such as search, summaries and assistants inside the app. For UK businesses, we design data handling around UK GDPR, encrypt data in transit and at rest, and keep the code in a repository you own. Hosting, backups and monitoring are set up from the start, so the app is treated as a working system from day one rather than a side project. We act as your web application development agency from first workshop to launch, and for web and mobile application development we build apps that install to a phone's home screen without an app store.
- Role-based access for staff, clients and partners
- Integrations with CRMs, accounting packages and internal databases
- Installable on phones as a web app, without an app store
What’s included
- Process mapping workshop and written scope
- User flows and interface design for key screens
- Front-end and back-end build in TypeScript
- Database design, user accounts and role-based permissions
- Integrations with your existing systems and APIs
- Automated tests, hosting, backups and monitoring
- Staff onboarding and admin documentation
- Code repository and technical documentation handed to you
Not sure what you need yet? Get a free audit and a clear plan, with no obligation.
Get my free auditHow it works
- AuditWhat you have today, what competitors do, and what’s costing you enquiries.
- PlanPages, features, searches to target, integrations and a fixed written quote.
- DesignDesigned in the browser, so you review the real thing, not a picture of it.
- BuildFast, accessible, secure code, connected to the tools you already use.
- GrowLaunch, tracking and monthly improvements from real data.
Related work
AdlogueAd intelligence web app: finds the Meta ads winning in a category and explains why they work.
marketing toolweb appAI
AdletteAI ad generation: conversion-tested UGC-style video ads for direct-to-consumer brands.
marketing toolAI applive
AtelicEnterprise AI applications for complex industrial operations, built on company data and systems.
AI applicationenterpriselive
Questions
How much does web application development cost in the UK?
It depends on scope: the number of user types, screens, integrations and any AI features. The free audit maps your process and ends with a written quote for the first version, with later phases outlined separately so you can plan ahead.
What is the difference between a website and a web application?
A website mainly presents information. A web application lets people do things: log in, enter data, book, quote, approve or report. Many businesses need both, connected to each other, so a website enquiry can become a record in the app without anyone retyping it.
How do you scope a web application?
We map the current process first, then agree the smallest version that removes the most work. That version ships first and grows from real use.
Can it work on phones?
Yes. Web apps are built responsive by default and can be installed to a phone's home screen without an app store.
Is my data secure?
Access is role-based, data is encrypted in transit and at rest, and we follow UK GDPR in how personal data is stored and processed.
Can you add AI features to a web application?
Yes. Search across your documents, automatic summaries, data extraction from uploads and assistants that answer staff questions can all sit inside the app, built on your own data.
Related services
By industry
Find out what to fix, build or automate first
Tell us about your website, the app you have in mind or the work you want off your plate. We’ll review it and send you a clear, practical audit made for your business. Free, no obligation, and yours to keep.
- What’s costing you enquiries on your current site
- Where a custom web app or AI could save your team hours
- The fixes and features that would pay back first
- A clear written quote, only if you want one
Rather email? hello@thirdtab.co.uk