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Prototype & fidelity 1:14
A 74-second explainer of Prototype & fidelity, narrated over the same demo you can try yourself.
Try the interactive Prototype & fidelity demo
What this video covers
A prototype is a working model of a design made to be tested, and fidelity is how closely it resembles the finished product. Low-fidelity prototypes (paper sketches, clickable wireframes) are rough, fast and cheap; high-fidelity ones (polished, interactive, near-real) look and behave like the real thing. Choosing the right fidelity for the question you're asking is the whole skill.
Slide from paper to polished and you can feel what each fidelity is for: the rough version is fast and invites big-picture critique, while the realistic one tests the actual look and feel. There's no single "right" fidelity - only the right one for the question you're asking and how far along you are. Go high too early and you waste effort and chill honest feedback; stay low too long and you never test the real thing.