Ask what it costs to take payments in your app and you will usually get a vague answer, because the cost to add Stripe to an app is really two separate numbers that people blur together. There is the one-off development work to build the integration, which for a UK app runs from roughly £2,000 for a simple checkout to £15,000 for full subscription billing. And there is the fee Stripe charges on every single transaction, forever. Confuse the two and you will either underbudget the build or ignore the running cost that quietly eats your margin. This guide separates them cleanly and shows what drives each one.
How much does it cost to add Stripe to an app?
The cost to add Stripe to an app is a one-off development cost plus an ongoing per-transaction fee. In the UK, a basic one-time card checkout typically costs £2,000 to £5,000 to build, a full subscription and billing system costs £8,000 to £15,000, and Stripe then takes its published rate of 1.5% and 20p on each UK card payment on top, for as long as the app runs.
That two-part shape is the whole answer in miniature. The build is what you pay your developers once to wire Stripe into your product safely. The fee is what you pay Stripe out of every sale. Founders who only budget for the first are the ones surprised by their margin a year later, and founders who only think about the second underestimate the engineering the first time payments go in.
Part one: the development cost
The development cost is the engineering time to connect Stripe to your app, handle the payment flow, deal with successes and failures, and keep it secure. A simple integration, where a customer pays once for a product or a booking, is the cheapest, because the flow is short and the edge cases are few. That work usually lands between £2,000 and £5,000 for a UK build, assuming the rest of the app already exists.
Costs climb as the payment logic gets richer. Saved cards, subscriptions with trials and upgrades, proration when someone changes plan mid-month, refunds, invoices, and handling failed renewals all add engineering. A full billing system with recurring plans commonly runs £8,000 to £15,000, because each of those behaviours is a feature in its own right that has to be built, tested, and made reliable with real money on the line. These ranges reflect what a UK studio charges for the payments slice specifically, and they sit inside the wider picture we cover in how much an app costs to build in the UK in 2026.
Part two: Stripe’s transaction fees
Separate from the build, Stripe takes a cut of every payment. Its standard published rate for UK cards is 1.5% and 20p per successful domestic charge, with higher rates for EEA and international cards, and extra fees for some features like currency conversion or certain payout options. You can confirm the current numbers on the official Stripe pricing page, and you should, because payment fees move and this paragraph will age.
The reason this matters as much as the build is that it never stops. On £10,000 of monthly UK card revenue, that headline rate is roughly £150 plus the per-transaction pennies, month after month. It is a cost of doing business rather than a problem to solve, but it belongs in your model from day one, because it shapes your pricing and your unit economics far more than a one-off integration fee ever will. If your margins are thin and your payments are large and recurring, it is also the number that would push you to compare alternatives, which we do in Stripe vs GoCardless vs PayPal for UK apps.
What drives the Stripe integration cost up
Four things move the build cost more than anything else. The first is subscriptions. One-off payments are simple; recurring billing with plan changes, trials, and dunning for failed payments is where the hours go. The second is where the payment lives. A checkout inside a native iOS or Android app carries platform rules and testing overhead that a web checkout does not, which adds time.
The third driver is compliance and security. Handling card data properly, supporting Strong Customer Authentication so more UK payments clear on the first attempt, and building the flows that keep you inside the rules all take real engineering, and skipping them is not an option. The fourth is everything around the payment rather than the payment itself: receipts, invoices, an admin view of transactions, refunds your support team can issue, and reporting for your accountant. None of that is exotic, but each piece is work, and together they explain why two Stripe integrations can differ by £10,000.
A worked example: a subscription app
Picture a UK app that sells a £12 monthly subscription with a seven-day free trial. To take payments, it needs Stripe wired in to create customers, start trials, charge cards each month, retry failed renewals, let users upgrade or cancel, and issue refunds when support asks. Built properly, that is a subscription billing system, and it lands in the £8,000 to £15,000 range rather than the basic-checkout range, because almost every one of those behaviours is a feature that has to be built and tested with real money moving.
On top of that one-off build, Stripe takes its per-payment fee on every £12 charge, every month, for every subscriber, at the published UK card rate. At a thousand active subscribers that is £12,000 of monthly revenue with the headline percentage and the per-charge fee coming off the top before you see a penny. Neither number is wrong or hidden. The point is that a realistic budget names both: the build you pay once, and the fee you pay forever.
The trap: in-app purchase rules
One rule outweighs every fee comparison, because getting it wrong can get your app removed. If you are selling digital content or subscriptions consumed inside an iOS or Android app, Apple and Google generally require their own in-app purchase systems, which take up to 30%, reduced to 15% for many small businesses and for subscriptions after the first year. Stripe is for physical goods, real-world services, and payments that fall outside that digital-goods rule, not for unlocking premium features inside the app itself.
This single distinction can reshape your whole pricing model, because the platform commission dwarfs any card fee. The rules on what counts as digital goods, and when you may link out to an external payment, have shifted and remain contested, so confirm the current position in Apple’s and Google’s own developer policies before you design your monetisation. Choosing the wrong monetisation model is far more expensive than choosing the wrong processor, which is why this decision belongs at the start of the build, not the end.
Can you add Stripe yourself and skip the build cost?
For the simplest cases, sometimes yes, and it is worth knowing when. If you are selling a one-off product or a booking from a web page and you are comfortable with a bit of setup, Stripe’s hosted checkout and prebuilt payment links let you take card payments with very little engineering. For a solo founder testing whether anyone will pay at all, that can get you live for close to nothing, which is exactly the right move before you have proof of demand.
The build cost reappears the moment the payment has to live inside your product rather than beside it. Once you need payments embedded in a native iOS or Android app, tied to user accounts, driving subscriptions, updating what a customer can access, and handling refunds and failed renewals cleanly, you are building software, not pasting a link. That is real engineering with real money on the line, and it is where the £2,000 to £15,000 range comes from. The honest rule of thumb is simple: use the no-code route to prove people will pay, then budget the proper build once they have.
What to do next
The cost to add Stripe to an app comes down to two honest numbers: a one-off build of roughly £2,000 to £15,000 depending on whether you need a simple checkout or full recurring billing, and Stripe’s per-transaction fee that comes off every sale for as long as the app runs. Budget for both, decide early whether your product falls under the in-app purchase rules, and match the integration to how your app actually earns rather than building more than you need.
If you want a straight answer on what a payments integration would cost for your specific app, including where a simple checkout is plenty and full billing would be overkill, send us a project brief and we will scope it honestly. And if you are still choosing what to build the product on, our comparison of Firebase vs Supabase vs a custom backend covers the infrastructure decision that usually sits right next to payments.
.webp)
.webp)
