Four packages, in order of depth. Most people start with the free sprint and stop when they have enough. Everything upstream of manufacturing is fixed-fee – no scope surprises.
Complete 6-stage viability assessment at your own pace. Walk away with a structured output you can act on immediately.
A real engineer reviews your sprint output, sharpens the numbers, flags what AI missed, and gives you a clear viability assessment.
Your sprint and review output transformed into a professional, branded specification document – ready to show investors, manufacturers, or engineering teams.
A dedicated specialist consultation with a custom development roadmap, manufacturing strategy, and direct introduction to the engineering team.
– NOTE · All IEN tiers produce validated documents. Physical engineering work (CAD, prototyping, tooling, manufacturing) is delivered separately by Cast Iron CAD, quoted per project.
Every tier builds on the one before. You never pay for something you’ve already received.
Most people start with the Free Sprint. That’s the point – it’s free because it’s where most ideas either prove themselves or get quietly retired.
Add the Expert Review (£129) if you want a human to sanity-check what came out. Add the Spec Package (£399) if you need a document you can hand to someone else. Take the Premium Consultation (£699) if you’re serious about moving into prototyping and want a direct route into Cast Iron CAD.
Stages 6–10 – design, develop, engineer, manufacture, deliver – are quoted project-by-project through Cast Iron CAD once the spec is solid.
Start with the free sprint. Upgrade only if and when the output tells you it’s worth it. If you never spend a penny with us, that’s a fine outcome too.