There's a strange gap in the life of an idea. You've expanded it into a tidy proposal — maybe using the prompts from the last guide — and on paper it looks solid. But paper is where ideas go to feel finished without being tested. Nobody can react to a proposal. They can react to something they can see and click.
Prototyping used to mean hiring a designer and a developer, or learning both. It doesn't anymore. Free AI tools will turn a paragraph of description into a working interface, a landing page, and a logo — fast enough that you can do all three before lunch.
Start with the interface, not the brand
The instinct is to design a logo first because it's fun. Resist it. The most clarifying artefact is the UI mockup, because building it forces you to answer the questions you've been dodging: what's the very first screen, what's the one button that matters, what actually happens when someone taps it?
Tools like v0 or a general AI assistant's artifact feature will generate a clickable UI from a plain description. Paste your proposal and ask for the core screen. What comes back is rough — but the moment you see your idea as an actual layout, half-formed assumptions become obvious and you learn more in five minutes than in an hour of writing.
If you can't describe your main screen clearly enough for an AI tool to build it, your idea isn't ready — it's still vague. The prototype's first gift is exposing that, before you've sunk weeks in.
Then a landing page to test the pitch
Once the interface exists, build a one-page landing page describing the product as if it already shipped — the headline, the problem it solves, the single call to action. Free website builders and AI page generators do this in minutes from a text brief.
This isn't vanity. A landing page is the cheapest market test there is. Put it in front of ten people in your target audience and watch whether the headline lands and whether anyone clicks the button. You're not testing the product — you can't, it doesn't exist — you're testing whether the promise is compelling enough that anyone cares.
Logo and identity last
Now do the fun part. Free generative tools will produce a wordmark, an icon and a colour palette from a sentence about the product's personality. It's quick, it's good enough to make the landing page feel real, and — crucially — by now you actually understand what the product is, so the brand has something true to express.
Had you done this first, you'd have branded a thing you didn't understand yet. Last, it's the finishing coat on something that already has a shape.
The point is validation, not polish
Hold the whole exercise loosely. None of these outputs are the product — they're props for a conversation. The win condition isn't "a beautiful prototype," it's "I now know whether anyone wants this, and I spent £0 and one morning finding out." Most ideas don't survive that test, and that's the system working: you killed a weak idea in a morning instead of a year.
The ones that do survive earn their next step — and the reactions you gathered become fresh input for your next round of thinking. That feedback loop is the whole game, and it's the subject of the final guide in this series.
Catch the concept before you can prototype it.
The idea that becomes a prototype usually arrives somewhere inconvenient. Note Now captures it hands-free, in your own words, so it's there when you're ready to build. Free to download.
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