Looks-Like and Works-Like: Why You Need Both
May 13, 2026
Founders often ask us for the prototype, singular. In practice, the first thing we usually recommend is two prototypes that answer two different questions.
The looks-like prototype
This one is about form. It shows the size, shape, color, and finish of the final product. It might be a resin print, sanded and painted, with nothing inside it. It is what you hand to a potential customer, an investor, or a retail buyer to get a reaction.
A looks-like model answers questions like these. Is this the right size in the hand? Does it look like something people would pay for? Is the button where a thumb expects it?
The works-like prototype
This one is about function. It proves the mechanism, the electronics, or the physics actually work. It is often ugly. It might be bigger than the final product, held together with screws and tape, with wires hanging out. That is fine.
A works-like model answers different questions. Does the mechanism cycle reliably? Does it get too hot? Is the motor strong enough? What breaks first?
Why combining them too early hurts
When you try to make one prototype do both jobs, you compromise both. The mechanism gets squeezed into a shell that is not final, and the shell gets bent out of shape to fit a mechanism that is still changing. Every change to one forces a change to the other, and progress slows down.
Splitting them lets each one move at its own speed. Once both are proven, we merge them into an integrated prototype that looks and works like the real thing. That is the version that goes to manufacturers for quoting.
A note on cost
Our fees cover the engineering, CAD, and files. The physical prototype is made by a print shop, a machine shop, or on our own equipment, and it is billed separately. Two cheap prototypes that answer clear questions are almost always cheaper than one expensive prototype that answers neither.