Simple apps & web tools

Got an idea for an app? I build the simple version that actually ships.

Most app ideas don't need an agency, a six-month build or a five-figure bill. They need one person who can take the idea, build the simple useful version, and get it live. That's what I do - and I can prove it, because I build and run my own: two live apps with real users, real payments and real Google rankings.

Fixed quote up frontLive fastPayments built inRun & cared for after launch

Simple app development: interactive maps, calculators, booking tools and paid products - custom-built, live fast, with a fixed quote before you commit anything.

Proof first - two live apps of my own, linked below
Web-first - installs on any phone, no app-store gatekeeping
Takes money - Stripe one-off and subscription payments
One person - you deal with the maker, start to finish
The proof

I don't just pitch apps - I run two.

Anyone can promise you an app. Here's what I've actually built, shipped and run - both live right now, both built end to end by me.

ukgoldprospector.co.uk
UK Gold Prospector - interactive gold panning map app built and run by Kerb Studio
/ Case 01 · paid product

UK Gold Prospector

Interactive map · payments · Android app

An interactive UK gold-panning map: 300+ mapped sites with guides, user accounts, Stripe payments for one-off and subscription upgrades, 15+ SEO articles ranking on Google, and its own Android app - built from the map engine to the checkout, then ranked and run, entirely by me.

Interactive mapStripe paymentsUser accountsAndroid appSEO that ranks
Visit live ↗
wildswimmap.co.uk
Wild Swim Map - UK wild swimming map app built and run by Kerb Studio
/ Case 02 · data product

Wild Swim Map

Data map · official water quality · PWA

600+ UK wild-swimming spots on one free interactive map, each official bathing water tagged with its Environment Agency water-quality rating - filters, search, near-me, and offline support built in. A real data product, built from public data to polished app.

600+ mapped spotsOfficial EA dataFilters & searchWorks offline
Visit live ↗
What I build

Simple, useful apps - not bloated ones.

The apps above aren't flukes - they're the same handful of building blocks, proven live, that your idea probably needs too.

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Maps & data products

Interactive maps and data tools like the two above - your locations, your data, filters and search, fast on mobile. If your idea starts with "a map of...", I've built it twice.

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Paid products

Apps that earn: Stripe checkout for one-off and subscription payments, user accounts, and content or features that unlock when someone pays - the exact setup running on UK Gold Prospector now.

Tools & calculators

Quote calculators, booking and enquiry tools, members areas - the small, sharp web tools that save a business hours or turn visitors into customers. Wired into your website or standing alone.

How it works

Small scope, fixed quote, live fast.

Apps sink when the scope balloons. I do the opposite: we find the simple version of your idea that's genuinely useful, I give you a fixed quote, and we get it live while the momentum's there. Then it's looked after on a simple monthly, like everything I build.

App development FAQ

The things people ask first.

What counts as a "simple app"?
An interactive map product, a quote calculator, a booking tool, a members area, a paid content product - anything where one clear idea meets real users. Both my live apps started exactly that simple; the trick is shipping that version instead of the bloated one.
Do you build iPhone and Android apps?
I build web-first apps - they load instantly from a link, install to the home screen on any phone, and work offline where it matters. UK Gold Prospector also ships as an Android app on Google Play from the same build, so an Android store presence is possible without a separate native project. I don't do native iOS development.
What does an app cost?
It depends on scope, which is exactly why step one is cutting the idea down to its simple, useful version - then you get a fixed quote before committing anything. A focused web app is far closer to the cost of a good website than to an agency app build.
Can it take payments?
Yes - Stripe checkout for one-off purchases and subscriptions, with features that unlock when someone pays. That exact setup runs live on UK Gold Prospector today.
Who runs it after launch?
I do - hosting, updates and care on a simple monthly, the same as my websites. I run my own live apps day in, day out, so yours is looked after by someone who actually operates products, not just builds them.
Get started

Tell me the idea - I'll tell you the simple version.

One email, no obligation. Tell me what you want to build and who it's for, and I'll come back with what I'd build first and a fixed quote.