Ask ten people what it costs to create an app and you'll get ten different answers, most of them useless. The honest truth is that "creating an app" covers everything from a weekend no-code experiment to a multi-year platform build — and the price follows the ambition. What most founders actually want to know is simpler: what will it cost to take my idea from a sketch to something real people can download? This guide walks through the full cost picture in the UK: the build itself, the bits around the build that people forget, and the ongoing costs that separate a launch from a business. If you want the raw developer-day maths, our breakdown of app development costs covers that side in detail.
The build cost is only half the story
When founders budget for an app, they usually budget for the build: design plus code. In the UK, a professionally built first version typically lands somewhere between £30,000 and £150,000 depending on complexity — simple utility apps at the lower end, platforms with accounts, payments, messaging and real-time features at the upper end. But the build is only one line in a longer budget. Before a line of code is written, there's validation and design; after launch, there's hosting, maintenance, app store fees, marketing and iteration. A founder who budgets £60,000 for "the app" and has £60,000 total is already in trouble, because the app that launches and the app that survives are two different budgets.
A useful rule of thumb: whatever the build costs, plan for the first year of running the app to cost roughly another 40–60% of that on top — hosting and services, maintenance, small improvements, and the marketing needed to get your first users. That ratio shrinks as you scale, but in year one it's realistic.
What drives the cost up (and down)
Scope: the single biggest lever
Every feature is a cost multiplier, not just in code but in design, testing and maintenance. The difference between a £40,000 app and a £120,000 app is almost never the hourly rate — it's the feature list. Ruthless scoping is the cheapest money you'll ever spend. The question to ask of every feature is: "Does the app fail without this on day one?" If not, it goes in phase two. Most successful apps launched with an embarrassingly small feature set.
One platform or two
Building for both iOS and Android costs more than building for one. Cross-platform frameworks like Flutter let a single codebase serve both, which typically saves a meaningful chunk versus two separate native builds. Unless you have a concrete reason to go native — heavy gaming, complex AR, very demanding performance — cross-platform is the sensible default for a first version, and it's a genuine cost saver rather than a compromise.
The hidden half: backend, integrations and admin
The app on the phone is often the smaller part of the job. User accounts, databases, an admin panel so you can manage content and users, payment processing, push notifications, analytics, email — each integration is design, code, testing and ongoing maintenance. Founders routinely underestimate this by half. When you get a quote, check explicitly what's included beyond the screens: backend, admin tools, third-party integrations and analytics setup.
Design and validation
Proper UX design — research, wireframes, prototypes, usability testing — typically runs 15–25% of a build budget. It feels like an easy line to cut, but a confusing app bleeds the expensive users you paid to acquire. Cheaper to fix a flow in a design tool than in a shipped app with one-star reviews.
The costs nobody puts in the first quote
- Maintenance: budget 15–20% of build cost per year. Operating systems update, libraries break, bugs surface on devices you never tested. An app is a living product.
- Hosting and services: servers, databases, push services, SMS, maps usage, payment processing fees. Small at first, scaling with users — model it.
- App store fees: Apple charges $99/year for a developer account; Google Play is a $25 one-off. Apple's 15–30% commission on in-app purchases also shapes your pricing.
- Marketing and user acquisition: organic discovery in the app stores is brutal. Many founders spend as much acquiring users as they did building the app.
- Iteration: your first version will be wrong in places. Budget for learning from real usage and fixing what the data tells you, or you'll ship v1 and stall.
- Legal and compliance: privacy policy, terms, and — if you handle payments, health data or children's data — proper legal review. Not optional in the UK.
Ways to create an app for less (honestly)
Not every idea needs a £100,000 build. No-code and low-code tools can validate an idea for hundreds rather than thousands of pounds — fine for proving demand, rarely fine for a product you plan to scale. Freelancers cost less than agencies but you become the project manager, designer and QA department. Offshore development is cheaper on paper; the savings often evaporate in communication overhead and rework, though it can work well with very tight specifications and strong management on your side.
The most reliable way to spend less is to build less: a genuinely minimal first version, one platform to start, proven third-party services instead of custom-built everything, and a phased plan where revenue or investment funds phase two. Our custom mobile app development team scopes projects this way as standard — we'd rather talk you out of features than bill you for them.
How to read a quote without getting burned
Get quotes in writing with the scope itemised: what's included, what counts as a change, how testing is handled, who owns the code and accounts, and what happens after launch. Be suspicious of quotes dramatically below everyone else's — they usually mean corners you'll pay for later or a scope so narrow it won't survive real users. And be equally wary of the agency that quotes a number before understanding the idea properly; they're guessing, and you'll pay for the guess in change requests.
Finally, ask every bidder the same awkward question: "What will this cost me in year two?" The honest ones will give you a maintenance figure and a hosting estimate. The others will change the subject — which tells you everything.
If you're weighing up an app idea and want a straight answer on where it lands, get a free consultation — we'll talk through the idea, tell you what's driving the cost, and what you could sensibly cut for a first version. No finger-in-the-air numbers, no obligation.
FAQs
What's the cheapest way to create an app in the UK?
The cheapest credible route is a no-code tool or a tightly scoped cross-platform build of a minimal first version. No-code can cost hundreds of pounds and is fine for validating demand; a professional minimal build on one codebase for both platforms is the cheapest route to something you can actually grow. What doesn't work is trying to get a £100,000 app for £10,000 — the corners cut always resurface as rebuild costs.
How long does it take to create an app?
A focused first version typically takes 3–6 months from kickoff to app store submission, including design, build, testing and review. Simple apps can be quicker; platforms with complex backends, integrations or compliance needs run 6–12 months. Apple's review alone can add weeks if your first submission gets rejected, so don't plan a launch event for the day after submission.
Do I need both iOS and Android from day one?
Not necessarily. If your audience skews one way — check your market — starting on one platform is a legitimate way to cut v1 costs. But with cross-platform frameworks the saving from dropping a platform is smaller than it used to be, since one codebase serves both. The bigger question is whether maintaining two store listings, two review processes and two sets of edge cases is worth it before you've proven demand.
What ongoing costs should I budget after launch?
Plan for maintenance at roughly 15–20% of the build cost per year, plus hosting and third-party services that scale with users, the $99/year Apple developer fee, and whatever you're spending to acquire users. Most founders under-budget year-one running costs — as a rough guide, expect the first year of running the app to add 40–60% on top of the build cost.
Should I build an app or a mobile website first?
If your idea doesn't need app-store distribution, device hardware (camera, GPS, push notifications) or offline use, a mobile-friendly web app is cheaper to build, instant to update and needs no app store approval. Plenty of successful products started as web apps and added native apps once demand was proven. Build the app when the app itself is part of the value — not just because it feels more "real".
