What separates a good prototype agency from an average one?

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Accepted Answer

One thing, and everything else follows from it. An average prototype agency treats the prototype as the deliverable. A good one treats it as an instrument. An agency whose incentive is to hand over something impressive will drift towards polish: pixel perfect screens, a smooth demo, a case study photo. All of it optimised for how the thing looks in the meeting where it gets presented, and none of it telling you whether anyone would actually use the product. An agency whose incentive is that you learn something will drift the other way. Rough versions in front of real users early. The assumption most likely to be wrong tested first, not last. And a willingness to tell you the idea has a problem, which is the single hardest thing to buy in this market. Those two produce very different projects for similar money. You can usually tell which one you are dealing with inside ten minutes, because a good agency asks what you are trying to find out before it asks what you want built. If the first substantive conversation is about features, technology or screens, you are talking to a delivery shop. Three other signals worth weighing: Their case studies mention things that went wrong. Real projects have failed assumptions and abandoned features. Portfolios where every project went perfectly are describing marketing, not work. They will tell you what to leave out. Ask what they would cut to ship two weeks sooner. "Nothing" is a bad answer at any price. They test with people who are not you. Stakeholders and the internal team are the wrong audience, and a good agency says so unprompted. Everything else (team size, tech stack, awards, office) is context rather than evidence. Read the full guide to choosing a prototype agency in the UK → Talk to us about your idea →