How long does a prototype take?

Often days to a few weeks. If it takes months, it is already an MVP without the honesty.

Will we reuse the prototype code?

Sometimes. Often we rebuild the product properly. That is cheaper than polishing a sketch.

What do you need from us?

The question, access to real examples, and someone who can say “this failed”.

Can this become a product later?

Yes. We will tell you what to keep and what to rewrite.

150+ projects delivered for UK and international brands

AI Prototype Development in London

AI prototype development for London teams that need to see the idea work on their data — fast, honest and throwaway if it should be.

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AI prototype development for London teams that need to see the idea work on their data — fast, honest and throwaway if it should be.

Start Your AI Agent

Prove the AI idea before you fund a product

AI prototypes that answer a question, not a pitch

Design Dev builds AI prototypes so UK teams can see if the idea works on their content and their constraints. We keep them cheap to throw away.A prototype is not an MVP. If it should become a product, we will say what to rebuild.

Time-boxed prototypes

A deadline and a question. Not an open-ended “exploration”.

Your data, not a demo set

We use the documents and tools you actually have.

Honest kill criteria

What would make us recommend you stop.

A rebuild note

If it works, what must be rebuilt before users pay.

A clear AI prototype process from question to verdict

Name the question

What must be true for this idea to be worth a product.

Gather real inputs

The messy documents and tools — not a cleaned demo.

Build the thinnest slice

Enough UI to try it. No settings cathedral.

Run it with the team

They try to break it. We record what failed.

Verdict and next step

Stop, prototype again, or fund an MVP.

Prototype first when the idea is still a bet

If you do not know whether the AI can do the job on your data, do not fund a SaaS. Design Dev builds prototypes that answer that question.

We will tell you if the next step is an MVP, a chatbot, or nothing.

Time-boxed builds
Real data, not demo sets
Kill criteria written down
A rebuild list if it works
UK-English UX for the trial
A clear verdict

Start a project

Complete AI prototype capabilities

Fast proofs on your data — so you know whether to fund a product.

Internal prototypes

Staff try the idea on live work for a week.

Customer-facing trials

A closed group, not a public launch.

Retrieval proofs

Can we answer from your docs without inventing?

Workflow sketches

Clickable flows before engineering spend.

Model bake-offs

Same tasks, two approaches, a written comparison.

Go / no-go reports

What worked, what failed, what to rebuild.

Need an AI prototype that can fail honestly?

Speak with Design Dev about a time-boxed prototype on your data, with a verdict at the end.

Start Your AI Prototype

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AI prototypes across key industries

Industry focus

Professional Services

Draft and knowledge proofs on real matter content.

Draft trials
Knowledge tests
Intake sketches
Kill criteria

Discuss your project

Why Design Dev

A London team that will let a prototype fail

Design Dev builds AI prototypes for teams who need a verdict. If the idea should die, we would rather it die cheap.If it should become a product, you get a rebuild list — not a prototype dressed as an MVP.

150+

Projects delivered

Years experience

UK+

London & worldwide

98%

Client retention

Start Your AI Prototype

A London team that will let a prototype fail

Strategy, design and engineering for brands that need a website that performs.

Cheap to kill

A prototype that cannot be thrown away is already a product.

Real inputs

Demo datasets lie. We use yours.

Written verdict

Stop, retry, or fund. Not “let’s keep exploring”.

UK delivery

Straight answers, then a next step.

Technologies we work with

OpenAI

Python

Laravel

PHP

React

JavaScript

MySQL

HubSpot

Node.js

WordPress

Stripe

Figma

What clients say

Design Dev transformed our e-commerce platform. Their team was efficient, responsive, and delivered a stunning layout that doubled our conversion rate within a month.

Sarah Jenkins

Vauxhall Marketing - Shopify Development

An absolute pleasure to work with. They understood our brand identity perfectly and designed a clean, user-friendly SaaS platform that our clients love.