What is the difference between low-fidelity and high-fidelity prototypes, and when is each appropriate?

• A. Low-fidelity focuses on structure and flow; high-fidelity includes visuals and interactivity; use early to test concepts, later for design specs and testing.
• B. High-fidelity focuses only on color; Low-fidelity includes final code.
• C. Low-fidelity is used at deployment; high-fidelity is only for marketing.
• D. There is no difference between them.

Answer: (A)

Understanding prototypes at different fidelity levels helps you iterate efficiently. Low-fidelity prototypes emphasize structure and flow rather than visuals. They’re quick to create—think sketches or simple wireframes—focusing on layout, navigation, and how screens connect. Because they’re inexpensive to change, they’re perfect early in the design process for testing concepts, validating user paths, and getting feedback on what problems to solve without getting hung up on color, typography, or fine details.

High-fidelity prototypes resemble the finished product in appearance and behavior. They include detailed visuals, precise typography, color schemes, and interactive elements that respond like the real app. Use them later in the process to test usability with realistic interfaces, to refine interactions, and to communicate exact design decisions and specifications to developers or stakeholders. They also support more realistic user testing and stakeholder buy-in.

So, the idea is to start rough to explore ideas and structure, then move toward polished, interactive designs when you need accurate feedback or detailed specs.