Hire an App Developer: Freelancer, Agency or In-House?

You can hire an app developer in three ways: a freelancer, an agency, or an employee of your own. A freelancer is usually cheapest for a small, clearly defined job. An agency suits a business without a technical lead that wants design, build and launch from one accountable team. An in-house hire makes sense once the app is the business.

We’re an agency, so read the rest with that in mind. We’ll say where the other two routes win, because they often do. Below we compare them on cost, speed and risk with UK rate data to 1 October 2026, then cover IR35, code and store-account ownership, AI tools and how to hire.

Key takeaways

• Pick the route by asking who will make the technical decisions. If nobody on your side can, a freelancer leaves that gap with you.
• Advertised UK contract day rates had medians of £401 for iOS developers and £450 for Android developers in the six months to 1 October 2026 (ITJobsWatch). Adverts citing React Native or Flutter, which include architect and full-stack roles, had medians of £500 and £513. Employees also bring employer National Insurance and pension costs, and contractors can bring IR35 duties.
• Freelancers and agencies own the code they write unless you get a written, signed assignment, so put one in the contract.
• Open the Apple and Google developer accounts in your own company’s name. Moving an app out of someone else’s account needs their cooperation.
• AI and no-code tools are good for testing an idea. Get the code reviewed before real users depend on it.

Can I hire someone to build my app? Three routes compared

Yes. The three routes differ mainly in who carries the risk. A freelancer is one person you contract directly, an agency is a team accountable for the whole project, and an in-house hire is your own employee.

What differs	Freelancer	Agency	In-house hire
How you pay	Day or hourly rate, or a fixed fee per job	Fixed project price or a monthly team rate	Salary plus employer National Insurance, pension and equipment
Typical cost (UK, 2026)	iOS and Android contract adverts: medians of £401–£450 a day	A fixed price for the whole app; our builds start from £15,000	iOS and Android median salary of £85,000, plus employer costs
How soon work can start	Often within days, if they’re free	After a short scoping or design stage	After recruiting, plus the new hire’s notice period
Who runs the project	You, or a technical adviser	The agency, with you deciding priorities	You, or a technical lead you also hire
Who owns the code by default	The freelancer, unless assigned in writing	The agency, unless assigned in writing	You, as the employer
If the developer leaves	Work stops until you find someone new	Another developer should take over; ask how in writing	You recruit again
Best for	Small, well-defined jobs with technical oversight	A first version built and launched without a technical team	An app that is the core product, developed for years

An agency fits when you need an app for your business and have no technical co-founder; our app development work is priced this way, with scope and price fixed before work starts. It is the route we’d question for a two-day fix, where a good freelancer is better value. Even on a tight budget, with the build planned in stages, we had Simple PT’s deliberately lean booking-and-payments app live on both app stores two months from kick-off.

In-house fits when the app is your product, but your first hire needs a technical lead, or needs to be one. If you already have one, you can add engineers through staff augmentation, from £4,000 a month per embedded engineer. If you don’t, a dedicated team that we manage can cover the gap while you recruit.

How much does it cost to hire an app developer?

Advertised UK contract rates for mobile roles and skills had medians of £401 to £513 a day in the six months to 1 October 2026 (ITJobsWatch, checked 1 October 2026), and permanent salaries £75,000 to £85,000. ITJobsWatch takes these medians from the pay quoted in job adverts, excluding bonuses and benefits. An agency prices the whole app instead, since an app usually needs more than one developer. Our app builds start from £15,000 at a fixed price, and how much an app costs in the UK explains what moves that number. Employees add employer costs, and contractors can bring IR35 duties; both are covered below.

Role or skill (UK, 6 months to 1 Oct 2026)	Median contract day rate	Median permanent salary
iOS developer	£401 (45 rates quoted)	£85,000 (46 salaries quoted)
Android developer	£450 (43 rates quoted)	£85,000 (35 salaries quoted)
React Native (any role citing it)	£500 (61 rates quoted)	£80,000 (164 salaries quoted)
Flutter (any role citing it)	£513 (19 rates quoted)	£75,000 (14 salaries quoted)

React Native and Flutter are cross-platform frameworks, so one codebase runs on both iOS and Android. Their rows count every advert that cites the skill, not only mobile developer roles; architects, full-stack and front-end developers are among them. These are advertised rates from small samples, which move sharply; the iOS day rate, for example, sits unusually low against its salary.

What an employee costs on top of salary

Employing someone adds employer National Insurance at 15% on earnings above £5,000 a year in the 2026 to 2027 tax year (GOV.UK), and an employer pension contribution of at least 3% on qualifying earnings between £6,240 and £50,270 a year (The Pensions Regulator).

As an illustration, on the £80,000 React Native median, that is £11,250 of National Insurance (15% × £75,000) and £1,320.90 of pension (3% × £44,030): about £92,571 a year, roughly 15.7% on top of salary, before recruitment, equipment, management time and holiday cover. Eligible employers can cut the National Insurance with Employment Allowance, up to £10,500 a year per employer, not per hire (GOV.UK). Eligibility conditions apply, and this isn’t tax advice.

For general software developer rates, and the same sums on a £65,000 salary, see software development cost in the UK.

A day rate isn’t directly comparable with a salary. Contractors generally bill only the days they work and cover their own holiday, pension and equipment, so they can cost less for a short engagement.

Hiring a contractor? Check IR35 first

If a contractor works through their own limited company, the off-payroll working rules (IR35) decide whether they should be taxed like an employee. For a private-sector business, its size, or its group’s, decides who makes that call; public-sector clients always do.

For the 2026 to 2027 tax year, a private-sector company is medium or large if two or more of these apply: turnover over £10.2 million, a balance sheet over £5.1 million, more than 50 employees (HMRC’s guidance for clients). HMRC tests the last financial year whose accounts filing deadline fell before the tax year began, and a company is only medium or large once it meets the test in two consecutive financial years. Higher thresholds apply to these rules from the 2027 to 2028 tax year at the earliest (HMRC).

• Small private-sector clients don’t have to decide the contractor’s status, unless their group’s parent company is medium or large, in which case the rules apply to them too. Otherwise the contractor’s own company decides, and you must confirm your size if asked.
• Medium and large clients, and all public-sector clients, must decide the status with reasonable care and give the contractor, and whoever they contract with, a status determination statement with reasons. If you contract directly with the contractor’s company and the rules apply, you are the deemed employer and must deduct income tax and National Insurance and pay employer National Insurance.

Check your size, and your group’s if you have a parent company, against these figures before you sign. This isn’t tax advice.

Who owns the code and the app store accounts?

Code an employee writes as part of their job belongs to you, but a freelancer or agency owns the code they write unless they assign it to you in a signed, written agreement. The app’s store listing stays with whoever holds the developer account, so put both in your company’s name.

The code

• Employees. The employer is the first owner of the copyright in code an employee writes in the course of their job, unless agreed otherwise (Copyright, Designs and Patents Act 1988, s.11).
• Freelancers and agencies. Whoever you commission is the first legal owner, not you, unless you agree otherwise in writing (Intellectual Property Office). If the contract is silent, you may get only a limited, non-exclusive implied licence.
• Transfers. An assignment of copyright isn’t effective unless it is in writing and signed by the person assigning it (CDPA 1988, s.90).

So a non-disclosure agreement isn’t enough; it keeps your idea confidential but doesn’t transfer the code. Ask for a written, signed IP assignment, and check when it takes effect. With us, all code and IP are yours once the work is delivered and paid for. This isn’t legal advice; for a large contract, have a solicitor read it.

The developer accounts

Apple shows the enrolled organisation, or an individual’s own name, as the App Store seller (Apple). So an app published from your developer’s account lists them, or their company, as the seller, not you.

An Apple app transfer has to be started by the current Account Holder and accepted by the receiving one (Apple). On Google Play, you need to be able to sign in to the original account (Google).

Open both accounts in your company’s name before development starts and give your developer access, and do the same for the code repository, hosting, domain and paid services.

I have an app idea: what to prepare first

Prepare a short brief, a budget range and the paperwork for your own store accounts, so everyone quotes for the same thing.

Write the one-page brief. Who the app is for, the problem it solves, the one job the first version must do well, and what you are leaving out. The smallest version that tests your riskiest assumption is cheaper and tells you what to build next, the thinking behind MVP development.

Decide which platforms you need. Most business apps can reach both app stores from one cross-platform codebase (React Native or Flutter), so one developer or team covers iOS and Android. A native build can be worth the extra cost when the app depends heavily on device hardware. Adinkra, a React Native app we built for a jewellery brand, cost roughly half as much as building separately for each platform.

Decide whether you need a prototype first. A clickable prototype can show whether users, or investors, want the app before you pay for a build. We delivered one for Fix My House, a homeowner and tradesperson marketplace, in weeks, so the founder could test it with users and investors before funding development. If you already know what the app must do, our app design and validation stage (from £5,000) designs it screen by screen and tests it with real users on a device. If you are still testing the idea itself, a product discovery sprint (from £4,000) researches it and ends in a costed plan; taken through to a clickable prototype, it starts from £8,000.

Set up the business side early. Enrolling a company with Apple needs a D-U-N-S Number, a legal entity (not a trading name), someone authorised to sign agreements, a public website and an email on your own domain (Apple). Google Play also requires a D-U-N-S number for organisation accounts and warns that getting one can take up to 30 days.

Can ChatGPT or no-code tools build my app?

ChatGPT, other AI assistants and no-code builders can build a convincing first version, which is often enough to test an idea, but an app real customers rely on is a separate job. They are fast at screens, forms and simple logic; the gaps appear later, in security, personal data, payments, performance, store submission and maintenance.

App review is a hurdle too. Apple expects an app to go “beyond a repackaged website” (guideline 4.2), and rejects apps from a commercialised template or app-generation service unless the provider of the app’s content submits them directly (guideline 4.2.6). That rule targets services that submit apps for their clients, another reason to publish from your own account (Apple App Review Guidelines).

If you’ve already built something with an AI tool such as Lovable, Bolt, Cursor or Replit and it’s straining, our vibe code rescue audit of the codebase takes one week and costs £3,000.

How to find and hire an app developer

Whichever route you take, hire in five steps:

1. Write the one-page brief.
2. Pick a route from the comparison table.
3. Shortlist two or three candidates whose live apps you can download.
4. Ask the questions in the table below and get the answers in writing.
5. Sign a contract with a written, signed IP assignment that also covers any trial work, then start with a small paid task or a fixed-price design phase before you commit to the full build.

Where to look depends on the route:

• Freelancers. Marketplaces such as Upwork and Malt, developer communities and referrals.
• Agencies. Referrals and review directories such as Clutch.
• Employees. LinkedIn, job boards and specialist recruiters. If nobody on your side can judge their work, bring a technical adviser to interviews.

Overseas freelancers may quote less, but expect more vetting and time-zone gaps, and ask a solicitor whether the IP assignment is effective where they are based.

Questions to ask and red flags when hiring an app developer

Ask these before you sign.

Ask	A good answer	A red flag
Who will own the code, and when?	A signed, written IP assignment to you, triggered by a clear event such as final payment	”You’ll get the files” or only an NDA
Whose account will the app be published from?	Your company’s Apple and Google accounts, with the developer added	The developer’s own account “for convenience”
Where will the code live?	In a repository you own, or one you can access from day one	No access to the code until the end, and no written handover plan
What exactly is in the price?	A written scope listing design, backend, testing and store submission	A single figure with no scope behind it
How do I pay?	In stages, as work is delivered	A large sum up front
Can I see apps you’ve shipped?	Live apps you can download, and references you can call	Screenshots only, or nothing public
Who will actually write the code?	Named people you can meet, with their seniority and location stated	Vague answers, or the work passed to people you never meet
What happens after launch?	A defined support arrangement and cost	No answer, or “we’ll see”
How do you handle IR35? (contractors)	They know who decides status for a client your size	No awareness of the rules

For an agency, also read independent reviews. We’re rated 4.9 on Clutch and have delivered more than 50 projects since 2019; expect any agency to show you something comparable.

Our own team is remote and global, with leadership in London. Our terms, for comparison: scope and price fixed before work starts, milestone payments as each stage is delivered, your money back in full if you cancel within the first 21 days, and maintenance from £400 a month after launch.

Your next step: compare the routes for your app

Test your own scope against all three routes. Book the free 20-minute consultation below and bring your one-page brief, budget range and any quotes; we’ll tell you which route fits, including when it isn’t us. If your whole-app budget is below our £15,000 starting price for a build, a freelance app developer or a no-code prototype will serve you better. If an agency build does fit, our app development service starts with app design and validation from £5,000, and builds start from £15,000, both at a fixed price agreed before work begins.