Free MVP builder and fixed-price app development for UK founders

Scope your MVP free. Build it with us.

Plan your app before you pay for it. The free MVP builder takes you from the problem to a ranked feature list, the user journeys and screens, and a budget with your runway worked out, then gives you a brief a developer can price. When you are ready, we design and build it for a fixed price agreed after a free scoping call.

Scope your MVP free See a worked example
  • Free, no sign-up
  • Saved only in your browser
  • Word, PDF and a backup file

The MVP builder

Everything a first brief needs, in the order you need it. Answer the questions, rank your features, enter your numbers once, and the builder does the arithmetic and the layout.

  • A brief for your reader

    A developer, an investor, a validation plan or a one-page canvas: choose the reader and the builder sets out the sections they look for.

  • Features ranked, not listed

    Every feature is a Must, Should, Could or Won’t, with a user story, so the first version stays small and the quote stays honest.

  • Budget and runway worked out

    Enter build costs, funding, early revenue and running costs once. Your monthly cash, lowest point and runway follow.

  • Help on every question

    Plain-English hints, a worked example for each answer and, where it is switched on, AI suggestions written from your own answers.

  • A readiness check

    Before you send it: the gaps a developer or investor spots first, each with a link straight to the fix.

  • Download it your way

    Print or save as PDF, a Word document to finish in your own style, plain text, or a backup file to keep working on any device.

Open the builder

Why scope it with us first

  • Free scoping, where studios charge for it

    Studios that publish their prices often sell a paid discovery step before they fix one: from £350 for a one-day audit (Doted (opens in a new tab)) to £3,000 or more for a two-week sprint (Magora (opens in a new tab)). The builder lets you do that groundwork yourself, free.

  • Your brief stays yours

    It saves in your browser, not on our servers. Nothing is sent anywhere unless you agree to an AI suggestion, and you can send the finished brief to any developer you like.

  • Build less, know your runway

    In a 2026 study of 385 failed venture-backed start-ups, 70% ran out of money and 43% had poor product-market fit (CB Insights (opens in a new tab)). The scope, validation and runway steps are aimed at both.

  • One team to build it

    When the brief is ready, the same team designs and builds your MVP for a fixed price agreed after a free scoping call, with brand, company set-up and launch marketing available alongside.

How it works

Four steps from an idea to a product people can use. The first is free and up to you; we can do the rest together.

  1. Step 1 of 4

    Scope: Write your MVP brief, free

    The builder takes you from the problem to a ranked feature list, the main user journey and screens, success metrics and a budget with your runway worked out. Choose your reader first: a developer, an investor or yourself.

    A scope you can get a fixed price for

    You get

    • A brief a developer can price
    • Features ranked Must, Should, Could or Won’t
    • Budget, monthly cash and runway
    • Word, PDF and a backup file
    • No sign-up: it saves in your browser
  2. Step 2 of 4

    Talk: A free scoping call

    When you are ready, send us your brief and we go through it with you: what the first version must prove, what can wait, how it should be built and where the risks are. The call is free and you are under no obligation.

    An honest view before you spend anything

    We go through

    • What the MVP must prove
    • The Must haves, line by line
    • No-code, AI-assisted or custom code
    • Security, data protection and ownership
    • A realistic timeline
  3. Step 3 of 4

    Build: A fixed price, agreed in writing

    We send a written quote with a fixed price and timeline for the scope we agreed, and nothing starts until you accept it. Then we design the screens, build in short sprints and test with you before launch.

    The first version, at the price you agreed

    How we build

    • A fixed price for the agreed scope
    • Screens designed before code
    • Short sprints you can follow
    • Tested with you before launch
    • Code and designs yours once paid for
  4. Step 4 of 4

    Launch: Into real users’ hands

    A private beta, the go-live checklist and your first users, with brand, company set-up and launch marketing alongside if you want them. Then the metrics in your brief tell you what to build next.

    A product people can use, and a plan for what comes next

    Alongside the build

    • A private beta with real users
    • A go-live checklist
    • Brand and identity, if you need them
    • Company set-up, if you need it
    • Launch marketing

From idea to launch

Scoping is the heart of it. The stages before it test the idea; the stages after it build, launch and grow the product. Do each one yourself with a free worksheet, or let us build it with you.

  1. IdeaSharpen the idea: problem, users, your answer and a one-line pitch.
  2. ValidateTest the riskiest assumptions cheaply before you spend on code.
  3. ScopeThe MVP builderScope the MVP: features, journeys, budget and a brief a developer can price.
  4. BuildDesign, build and test the first version in short sprints.
  5. LaunchSet up properly, run a private beta and launch to real users.
  6. GrowRead the numbers, talk to users and plan the next version.
See all six stages

Free tools for the numbers

What an app costs to build, how long your money lasts, which features come first and how many paying users you need. Use them on their own or with your brief.

MVP cost calculatorEstimate the build from your features and a day rate, then add it to your budget.Open the tool Runway calculatorTwelve months of money in and out, your lowest cash point and how long your money lasts.Open the tool Feature prioritiserScore features by reach, impact, confidence and effort, and send the winners to your MVP scope.Open the tool Break-even calculatorHow many paying users a month cover your running costs, from your price and costs.Open the tool

A brief for whoever reads it

A developer prices from the scope and the screens; an investor looks for evidence, the team and your runway. Choose the reader and the builder sets out what they look for.

Build briefFor a developer, studio or technical co-founder: the scope, journeys, build approach and budget they price from.10 sectionsSee what goes in Pre-seed MVP planFor angels, pre-seed funds and grant panels: problem, evidence, scope, team, runway and the raise.11 sectionsSee what goes in Validation planTest demand before you build: your riskiest assumptions, the experiments and what counts as a pass.7 sectionsSee what goes in One-page MVP canvasThe short version: problem, users, value, the Must-have features and how you will measure success.5 sectionsSee what goes in

Worked examples: complete briefs for fictional UK products, with realistic numbers.

Guides for every step

Plain English, with the sources linked.

What is an MVP?Read the guide Writing an MVP briefRead the guide Scoping with MoSCoWRead the guide What an MVP costsRead the guide
All guides

Scope your MVP free. Build it with us.

Your brief becomes the build plan. When you are ready, the same team designs and builds your MVP for a fixed price agreed after a free scoping call, with brand, company set-up and launch marketing available alongside. Take one stage or the whole way.

  1. Idea

  2. Validate

  3. ScopeFree

  4. Build

  5. Launch

  6. Grow

Your MVP: 5 servicesBrand & growth: 4 servicesLaunch: 4 servicesTechnology: 5 services

How an MVP build works See every service

Questions founders ask

Is Startup With Me free?

Yes. The MVP builder, the idea-to-launch worksheets, the calculators, the templates, the examples, the guides and every download are free, with no sign-up. We earn from designing and building MVPs, which is optional and quoted at a fixed price before any work starts.

How much does it cost to build an MVP or an app?

It depends on the scope, which is why we quote each build at a fixed price after a free scoping call rather than publishing a price list. For context, UK studios that publish their prices list most MVP builds at about £8,000 to £30,000, with mobile apps and marketplaces costing more (Doted (opens in a new tab), Magora (opens in a new tab), Softomate (opens in a new tab)). The median UK contract rate for a full-stack developer was £500 a day in the six months to 14 November 2026 (IT Jobs Watch (opens in a new tab)). The MVP cost calculator gives you an estimate for your own features.

Do I have to build with you?

No. The brief is yours. Send it to any developer, studio or technical co-founder, or use it as the spec for a no-code tool or an AI app builder. If you would like us to build it, we start with a free scoping call and then send a fixed-price quote.

Do I need to create an account?

No. Your brief saves in your browser as you type. To move it to another device or keep a copy, download a backup file and open it in the builder there.

Does it write the brief for me?

You write it, with a hint and an example for every question. Where AI drafting is switched on, you can ask for suggestions for empty questions, written from your own answers. Nothing is sent until you agree, and you edit what comes back. Your budget and runway are always calculated from your own figures, never made up.

What format do I get?

Print or save as PDF, a Word document you can edit, plain text you can paste anywhere, and a backup file to keep working later.

Is this financial or legal advice?

No. The tools calculate from the figures you enter, and the guides explain costs, funding schemes and rules in general terms. For decisions about funding, tax, contracts or investment, speak to an accountant, a solicitor or a regulated adviser.

Ready to talk about your build?

Ask about the builder, book a free scoping call or ask for a fixed-price quote. We reply within two working days.

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Startup With Me is independent and not affiliated with Start Up Loans, the British Business Bank, Innovate UK or any investor. The free tools work from your own figures and are not financial advice. No brief or service can guarantee users, revenue or funding.