– VIABILITY SPRINT

A two-hour, AI-guided review of your product idea.

Answer a structured set of questions. Get a defensible spec, realistic timeline and indicative costs back. No calls, no meetings, no cost – just a clear picture of whether your idea is ready to move.

Start Now · Free → POWERED BY CUSTOM GPT · BUILT BY CAST IRON CAD

– 01

What the sprint actually does.

SCOPE

The Viability Sprint is a custom GPT, engineered around the first five stages of our 10-stage framework. You open it, describe your idea, and it walks you through a structured interview – the same one we’d run in a paid consultation, scripted by working engineers.

At the end, it produces a structured output: a definition of the product, the biggest risks, a realistic timeline, and a ballpark cost envelope. The same document you’d expect from a much more expensive process.

We made it free because the earliest stages of a product are where people waste the most money – and where a small amount of structure saves the largest amount of cash.

Idea Capture – describe your idea in plain language. AI extracts the core concept from a rough sketch.

Discovery – competitor analysis, market size indicators, pricing benchmarks, gaps you could fill.

Innovate – M.SC.W feature prioritisation, key differentiators, IP considerations.

Evaluate – technical feasibility, manufacturing constraints, regulatory, commercial viability scoring.

Define – structured specification, timeline with stage durations, confidence-rated cost estimates.

Development-Ready – your complete Product Viability Brief, ready to share with investors or engineers.

– 02

What you walk away with.

DELIVERABLES

OUTPUT · VIABILITY BRIEF

Your complete Product Viability Brief.

Product concept statement
Competitor analysis summary
M.SC.W-prioritised feature list
Technical feasibility assessment
Structured product specification

→

OUTPUT · PLAN

Timeline and confidence-rated costs.

Development timeline with stage-by-stage durations
Indicative cost estimates, each confidence-rated
Prioritised next steps and recommended path forward
A format you can share with investors, co-founders, or engineering teams

– 03

Questions people ask before starting.

FAQ

IS IT REALLY FREE?

Yes. Zero cost, no card required, no lead-nurture sequence. If you want a human to review the output with you, that’s the £129 Expert Review – separately and only if you want it.

HOW LONG?

Most people finish in 90 minutes to two hours of focused work. You don’t have to do it in one sitting, but a single block produces the cleanest output.

WHO IS IT FOR?

Founders, engineers, and product thinkers with an early-stage physical product idea. Not apps. Not services. Things that get made, packed, and shipped.

WHO SEES MY IDEA?

Your session runs inside a custom GPT. We don’t share or review individual sessions. If you book the Expert Review, you choose what to share and when.

NOTE · START HERE

Two hours. Zero cost. A spec you can defend.

The Viability Sprint is free. The next decision – whether to spend real money on prototyping and tooling – is much easier once you’ve run it.

Start Your Free Sprint → Or see all packages →