Web App Development

Web applications built around how your business runs. We design and build the dashboards, portals and internal tools your team relies on.

ABC Walls accident reporting dashboard built by Old.St Labs

Built their fleet electrification calculator and the dashboard for their charger management system.

Built the original product giving pharma direct text-message access to doctors, now one of the fastest-growing healthcare businesses in the US.

Built a research tool exploring how grocery apps like Tesco and Just Eat can nudge shoppers towards healthier choices.

Long-standing innovation partner, building compliance tools that monitor trades and communications across their global capital markets business.

Built the personal development platform giving every care worker a tailored growth plan.

Built a collaborative, AI-assisted platform that automates screening of thousands of medical studies from PubMed, Google Scholar, and file uploads for medical device regulatory audits.

Built the incident reporting platform behind safety reporting across the UK's indoor climbing walls.

Built a subscription platform providing maths learning content for teachers.

Built the GenAI platform turning team conversation transcripts into measurable behaviour intelligence.

Built the automation running media plan delivery for one of the UK's media agencies.

Rebuilt their Learning Management System to improve student achievement and provide students with access to the research-based and federally approved curriculum.

Built the practice management system running Guernsey's trusted veterinary clinics.

Built the AI-assisted platform giving their brokers live availability across corporate office space in the UK.

Helped make their ground transport platform mobile-friendly and delivered supporting backend work across their taxi, ride-hail and chauffeur services.

Built a customer-first ecommerce platform to support jetting professionals worldwide

Built a safeguarding app that helps organisations protect children and vulnerable adults by reminding stakeholders of their safety roles

Took over development of Molehill Mountain, their app helping autistic people manage anxiety and stress.

Built the GenAI tool helping researchers match the right drugs to the right diseases, faster.

Built a CRM enrichment tool that pinpoints contact locations and makes their deal-sourcing data pull its weight.

Long-standing partner building the iPad dashboards behind their large-format displays, plus the online environments for showcases like the Aston Martin F1 launch and the Levi's summer collection.

Overview

We build web applications that hold up under real use. We pair AI-assisted prototyping with senior engineering, so you see a working prototype in days and a production-ready first version in weeks.

Most of the web app work we take on is operational: a dashboard that replaces a spreadsheet, a portal that gives customers a self-serve view, an internal tool that removes a manual step from a process nobody enjoys. Sometimes the web app is the product itself: a SaaS platform or marketplace a founder is taking to market. Either way, before any code is written we understand how you operate, so what we build is the right thing rather than the obvious one.

Everything we ship is responsive, accessible and set up so you can see how it's being used, with AI added where it earns its place. You own the code and the intellectual property in full.

Partnering with Old.St Labs

Why choose Old.St Labs for web app development?

Interactive Prototyping Before Production

You interact with a working prototype before we commit to a build. It settles scope, surfaces the awkward edge cases early, and means the estimate you get is based on something real.

Dashboards, Portals and Internal Tools

Data-dense interfaces are our default territory: role-based access, audit trails, reporting, bulk actions and the unglamorous workflow detail that decides whether a tool gets used.

Replacing Software That Nearly Fits

If your team is paying for software it works around, or running part of the business on spreadsheets and email, we build the tool that fits how you actually work. You stop paying for features you don't use, and the licence fees stop climbing every time you grow.

Rescue and Modernisation

We regularly take over products started elsewhere, from prototypes built on Lovable, Replit, Cursor or Bolt to ageing custom systems whose original developers have long since moved on. It starts with an audit, then a clear plan for what to keep, improve and rebuild.

Built to Scale, Built to Hand Over

Automated testing, reliable release processes and documented infrastructure on AWS. We're an AWS Select Tier Partner, and we write every system so another team could pick it up without an archaeology project.

AI Where It Earns Its Place

From LLM features such as search, summarisation and document understanding through to agentic workflows that complete multi-step tasks. Sometimes the honest answer is that you do not need it yet.

Web App Development Lifecycle

How we build your web app

01

Definition & Scoping

We partner with you to define the core problem, map the processes around it, and work out where a web platform will make the biggest difference. You leave with a scope, a plan and a number you can rely on.

Strategy

Research

Workshop

02

Product & System Design

User journeys and interface design, alongside the data, integrations and user permissions that sit behind them. You interact with a working prototype before we build anything.

UX

UI

Data & Security

03

Agile Engineering & Integration

Two-week cycles, with a working version you can use from the first sprint. Automated testing, reliable releases, connections to the tools you already use, and AI where it earns its place.

Agile

Testing

Integrations

04

Launch and Continuous Growth

We ship to production on AWS with monitoring, analytics and a handover your team can act on. Then we keep evolving the platform with you as real usage tells you what matters next.

Cloud

Monitoring

Partnership

Tech stacks

We select modern, battle-tested tools designed for speed, security, and long-term maintainability

All
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Engineering & AI Stack
Design & prototyping
Engineering & AI Stack
Engineering & AI Stack
Design & prototyping
Engineering & AI Stack
Cloud & Infrastructure
Design & prototyping
Engineering & AI Stack
Engineering & AI Stack
Engineering & AI Stack
Engineering & AI Stack
Engineering & AI Stack
Engineering & AI Stack
Engineering & AI Stack
Cloud & Infrastructure
Engineering & AI Stack
Collaboration & Management
Testimonials

Real-world impact, narrated by the teams we’ve accelerated. This is what happens when human vision meets our AI-integrated build cycles

They sped things up a lot, particularly toward the end.
Feedback summary
Old.St Labs accelerated delivery and supported the successful redesign project while maintaining strong execution.
Robert Rothkopf
Managing Partner, Balance Legal Capital LLP
They were invested in the same outcomes as we were.
Feedback summary
The MVP and website were delivered on time and within budget with a highly collaborative approach.
Matt Lees
Founder, East Care
I was super impressed!
Feedback summary
Old.St Labs launched the app successfully, delivered a user-friendly experience, and maintained excellent communication.
Ira Guha
Founder, Asan Wellness UK Ltd
They delivered great value for a very reasonable price.
Feedback summary
Old.St Labs successfully delivered the redesigned website and required features while supporting SEO improvements.
Lucy Woodhead
VP of Operations, US Jetting
Old.St Labs is remarkably positive, collaborative, and easy to work with.
Feedback summary
The client's system received a positive response and strong uptake. Old.St Labs was helpful, responsive, professional, communicative, and stayed on budget.
Kath Hipwell
CEO, The Association of British Climbing Walls
We can give Old.St Labs our ideas and they help make them better.
Feedback summary
The revamped website received positive feedback. The team showed strong project management and contributed valuable ideas.
Director, Healthcare Startup
They are extremely personable, friendly, and open to all sorts of last-minute requests.
Feedback summary
Old.St Labs built virtual event platforms capable of supporting over 50,000 concurrent users and adapted well to changing requirements.
Daniel Postlewaite
Production Director, Pixel Artworks
They did their best to implement our requirements in a cost-effective and timely manner.
Feedback summary
The client was satisfied with the functional app. Old.St Labs was communicative, responsive, timely, and delivered a cost-effective solution.
Steve Castillo
CEO, rXperius
They acted as a trusted partner and supported me as a non-technical founder in building a technical product.
Feedback summary
Old.St Labs delivered an accurate, high-quality solution within budget. The team's personable approach, exceptional communication, and openness to feedback ensured a successful engagement.
Ross Hunter
Founder, Livis Analytics
Their team has excellent customer service and makes sure all of our needs are met.
Feedback summary
The client is planning to launch their app near the end of 2022, and so far, they're pleased with the quality of Old.St Labs' bug-free deliverables. Old.St Labs' timely daily communication, despite time zone differences, and weekly meetings via Google Meet have facilitated an efficient partnership.
Locke Davis
CEO, Pickr
They provided outstanding quality of work.
Feedback summary
The client was happy with Old.St Labs' work. The team excelled at project management with on-time delivery and prompt replies through Slack. Their effective communication through virtual meetings, emails, and messages and high-quality work also contributed to the project's overall success.
Cosmin Drimba
CEO, safeINIT
We are so glad we trusted Old.St Labs with building our website!
Feedback summary
Old.St Labs led a transparent and communicative process via virtual meetings. Old.St Labs' team was always available and responsive to requests. The client also praised the team's organization, trustworthiness, and ability to address issues.
Hannah Woodhead
Founder, Awesomenicity
The team is very responsive to the requirements of the project.
Feedback summary
Old.St Labs has delivered the project on time and demonstrated a weekly progress report. The team consistently responds to the client's needs, particularly during app testing. Moreover, they're proactive about finding creative solutions and were strong project managers.
Epidemiologist, Estima Scientific
They were very forward-thinking.
Feedback summary
Old.St Labs has successfully delivered a working platform with all the client's feature requests. The team has been incredibly responsive and attentive to the client's needs. They have a great, friendly team and lots of good ideas and iterations. They also communicate via email and virtual meetings.
Founder, Flux HQ
They knew exactly what I wanted and delivered it.
Feedback summary
Old.St Labs successfully delivered an extremely professional platform, much to the client's delight. The team demonstrated a deep understanding of the client's needs and showcased their expertise. Moreover, the team was professional and attentive to detail throughout the engagement.
Rob Hartley
Founder, WealthWritr
The team is really eager to produce the technology and satisfy their client.
Feedback summary
Thanks to Old.St Labs, the first version of the web app is due for launching in the near future. The team upholds great communication and constant availability as the project progresses. They also provide sound counsel and guidance, which is helpful to a client with no background in development.
CEO & Founder, Mental HealthTech Company
They were just highly focused on delivering the results rather than the process.
Feedback summary
The client was highly satisfied with the work Old.St Labs delivered, citing the partnership as first-class. The team went beyond the original scope of the project that exceeded all expectations. They were highly knowledgeable in their field which reflected well on their highly structured process.
Ben Burch
Founder, Allegr
FAQs

Got questions? We've got answers.
Everything you need to know about how we build, ship, and partner with you

What kinds of web applications does Old.St Labs build?

Management dashboards, customer portals, internal tools, marketplaces, compliance and reporting platforms, and bespoke replacements for off-the-shelf SaaS that no longer fits. We have delivered more than 60 products since 2020 across education, healthcare, finance, property, fitness, ecommerce and not-for-profit.

How much does it cost to build a web app in the UK?

It depends on what you want to build. Engagements range from around £10,000 for smaller focused projects up to £100,000 and beyond for larger or multi-phase programmes. We quote on a fixed-price or hourly basis, whichever fits the project, and work with UK and US clients. If scope changes mid-project, you see the change and the cost before it happens.

How long does it take?

A working prototype typically takes days. A production-ready first version usually takes 8 to 12 weeks, and larger platforms with complex integrations take longer. The biggest variable is not the technology, it's how many features and integrations you want in the first release. We'll give you a realistic timeline during scoping rather than a hopeful one.

Should we build custom software or stick with off-the-shelf SaaS?

Often off-the-shelf is the right answer, and we'll tell you so. Custom software makes sense when you're paying for features you don't use, working around the ones you need, or watching licence fees climb as you grow. We'll look at what you pay now and what a build would cost before recommending one.

Can you take over a web app another team started?

Yes, and we do it regularly, from products built on Lovable, Replit, Cursor etc. to older custom systems nobody left in the business understands. The starting point is an audit of what condition the code is in, then a clear plan for what to keep, improve and rebuild. We're honest if a fresh start is faster than the rescue.

Do you work with non-technical founders?

Yes, it's who we started the company for. Both our founders came from business backgrounds rather than engineering, so everything runs in plain English and you're never left guessing. We do the translating; you make the decisions.

Can you add AI to a web app we already have?

Yes. We start by looking at where AI would save your team time or improve what your customers get, then build it into the system you already run. Sometimes the right answer is that it isn't worth it yet, and we'll say so.

Who owns the code and the intellectual property?

You do. All code, designs and intellectual property created in your engagement transfer to you in full on payment. Your product runs in a cloud account in your name, and you have the code and documentation whenever you want them. We don't retain rights, licence the work back to you, or build in dependencies you can't extract.

What happens after launch?

For most clients, launch is the start of a longer innovation partnership. We keep evolving the product based on what real users tell you, build new features, and apply new AI capabilities as they become available. Several of our client relationships are now four to five years long.

Services

Explore our full suite of product capabilities. We build connected digital ecosystems that drive growth across every screen

Contacts

Let's talk
‍High-quality results, delivered fast by a team you trust

Rob Lynch, Co-Founder of Old.St Labs, smiling headshot against a teal background

Rob Lynch

Co-Founder

After starting his career in banking and renewable energy investment, Cambridge Master of Finance graduate Rob L. founded CityMunch in 2016, an award-winning restaurant deal app that raised two rounds on Seedrs and reached 100,000 users.

Rob Woodhead, Co-Founder of Old.St Labs, smiling headshot against a teal background

Rob Woodhead

Co-Founder

Rob co-created EV Technology in 2017, an award-winning business helping vehicle fleets transition to electric, after an initial career in corporate finance and private equity across London and New York. He co-founded Old.St Labs to be the development partner he wished he'd had as a non-technical founder.

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