# Mockup

> A static, high-fidelity picture of a screen — final colors, type, and imagery — showing exactly how the interface will look.

- Category: Deliverables & Artifacts
- Canonical: https://www.themasterly.com/glossary/mockup

A mockup is a static, high-fidelity picture of a screen: the real colors, the real type, the real imagery, arranged as the interface will actually appear. It answers one question, which is how the thing will look, and it does not answer any question about how it behaves.

The word carries a second meaning that has nothing to do with product design. In graphic design, a mockup is a photorealistic template for presenting artwork in context, on a t-shirt, a billboard or a phone in somebody's hand. Both senses are common enough that it is worth saying which one you mean.

## Where it sits between wireframe and prototype

| | Shows | Question | Cost of a change |
|---|---|---|---|
| **[Wireframe](https://www.themasterly.com/glossary/wireframing)** | Grayscale structure and hierarchy | What goes where, and in what order? | Minutes |
| **Mockup** | Final visual treatment, static | How will this look? | Hours |
| **[Prototype](https://www.themasterly.com/glossary/prototyping)** | Linked screens and interaction | How does this feel to use? | Hours to days |

Each step forward costs more to undo, which is the entire argument for doing them in order. A structural problem discovered at wireframe stage is a rearrangement. The same problem discovered at mockup stage means redrawing finished work, and the finished quality of that work makes people reluctant to change it, which is the more expensive part.

## What a mockup has to contain

The default is a screen full of plausible content in its ideal state, and that is the version least like production.

**Real content, at real length.** The longest customer name, the account with a forty-character company, the label after translation. Placeholder text is uniform and short, which is exactly why it hides layout problems.

**Every state the screen will have.** Empty, loading, partial, error, and the version holding far more data than looks comfortable. In B2B products these are close to half of what users actually see, and they are usually invented by an engineer late in a build because the mockup did not cover them.

**The role variants.** An admin, a member and a read-only viewer see different versions of most screens. Drawing one and leaving the rest to inference hands the decision to whoever builds it.

**The responsive behaviour, or a statement about it.** A single desktop frame implies that somebody has thought about narrow screens. Often nobody has.

## What it cannot settle

A mockup is convincing, and its persuasiveness is the risk. A screen that looks finished invites approval of things it has not actually tested.

It cannot tell you whether a flow works, because there is no flow. It cannot tell you whether people understand the labels, because nobody is attempting a task. It cannot show pace, feedback or the experience of waiting, all of which belong to [interaction design](https://www.themasterly.com/glossary/interaction-design). And it cannot reveal a structural problem, because by this stage the structure has been accepted.

The practical consequence: review a mockup for craft, hierarchy and completeness, and resist the temptation to also decide the flow in that meeting. That decision belonged two steps earlier.

## Mockups in a component-driven team

Once a [design system](https://www.themasterly.com/glossary/design-system) exists, mockups stop being drawings and become arrangements. A screen assembles from existing components in a fraction of the time, and it inherits states and behaviour that were decided elsewhere and are already built.

Two things change as a result. Producing a second and third option becomes cheap enough to be routine, which is a real gain. And the mockup stops being the place where visual decisions are made, since most of them were made once, in the system. What the mockup now decides is composition: what appears on this screen, in what order, at what weight.

The risk that comes with it is quiet. A screen assembled entirely from existing parts can only propose arrangements of things that already exist, which is right for most work and limiting for the cases that genuinely need something new.

## Getting a mockup reviewed usefully

A finished-looking screen changes how a room behaves, and a review that does not account for that produces the wrong feedback.

**Say what is already decided.** If the structure was settled at wireframe stage, say so at the start. Otherwise the polish invites the room to reopen everything, and structural comments arrive when structural change is most expensive.

**Show the states together.** Reviewing only the ideal screen produces approval of the ideal screen. Putting the empty, loading and overloaded versions on the same wall usually generates more useful comment than the main one does.

**Name the deviations.** Where the screen departs from the [design system](https://www.themasterly.com/glossary/design-system), point at it and explain why. Unmarked deviations get read as mistakes by engineers and as precedent by other designers.

**Ask for decisions, not reactions.** "Does the hierarchy put the right thing first?" produces an answer. "Thoughts?" produces the room's individual preferences about individual elements.

## In practice

A team reviews a dashboard mockup and approves it. Three weeks later the built version looks wrong, and nobody can say precisely why.

Comparing them explains it. The mockup showed six metric cards with short labels and healthy-looking numbers. Production has eleven cards, because the account has eleven data sources, and three labels wrap to two lines, which breaks the card heights. There is also a loading state nobody drew, so the screen assembles itself in visible stages.

None of that was a build error. Every difference traces back to the mockup showing a tidy case that does not occur, and the fix at this point costs a sprint. Drawing the eleven-card version and the loading state would have cost an afternoon.

## Where teams get it wrong

- **Placeholder content.** Uniform, short and false, which is the opposite of production data.
- **One state per screen.** The empty and error versions are real screens and get built anyway, by somebody else, late.
- **Approving the flow at mockup review.** The screen looks decided, so the meeting decides everything, including things it cannot see.
- **Skipping the wireframe because the system makes mockups fast.** Speed at high fidelity means structural mistakes arrive already polished.
- **Mockups as documentation.** They are a decision, not a record. Once the screen is built, the code is the truth.

## Related terms

- [Wireframing](https://www.themasterly.com/glossary/wireframing)
- [Prototyping](https://www.themasterly.com/glossary/prototyping)
- [UI Design](https://www.themasterly.com/glossary/ui-design)
- [Visual Design](https://www.themasterly.com/glossary/visual-design)

## Learn more

- [UI/UX design for B2B SaaS](https://www.themasterly.com/services/ui-ux-design)

## FAQ

**What is a mockup in design?**

A static, high-fidelity picture of a screen with its real colors, type and imagery, showing how the interface will look. Note that the word has a second common meaning outside product design: a photorealistic template for presenting artwork on a t-shirt, poster or phone. This entry is about the first.

**What is the difference between a wireframe, a mockup and a prototype?**

A wireframe is grayscale structure: what goes where. A mockup is the finished visual, and it does not move. A prototype links screens so somebody can attempt a task. Structure, appearance, behaviour, in that order, and each costs more to change than the one before it.

**Do teams still make mockups now that design systems exist?**

The artifact changed rather than disappeared. Assembling a screen from existing components produces the same thing faster, and the work shifts from drawing an interface to choosing and arranging parts. What remains necessary is a decided view of the screen that engineering can build from.

**Should a mockup show every state?**

Every state the screen will really have, which is more than teams draw. Empty, loading, error and the version with far too much content are all real screens. A mockup showing only the ideal case leaves an engineer to invent the rest at the end of a sprint.

**Is a mockup the same as a comp?**

Effectively yes. Comp, short for composition, is the older print and agency term for the same thing: a finished-looking static representation for review and approval before production.

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