Consistency is one of the cheapest, highest-leverage things a designer controls — it costs nothing extra to make and directly reduces how much a user has to relearn on every new screen.
| Type | Meaning | Example |
|---|---|---|
| Internal consistency | The same element behaves and looks the same everywhere within one product | A "primary button" style is used identically on every screen, not reinvented per page |
| External consistency | Following patterns users already know from other products | A shopping cart icon in the top-right, a hamburger menu behaving the way every other app's does |
Once a user learns that a certain icon, color, or position means a certain thing in a product, every exception to that rule costs real mental effort to notice and relearn — this is why a "unique" one-off design choice on a single screen often makes the whole product feel less usable, even if that one screen looks great in isolation.
A design pattern is a reusable, proven solution to a common interface problem — a dropdown for choosing one of many options, a modal for a focused single task, a card for a repeatable content unit. Reaching for an established pattern rather than inventing a new interaction for a common problem is what actually produces consistency, both within a product and against user expectations from the wider web.
Save creativity for what actually needs it
Consistency doesn't mean never innovating — it means reserving genuine innovation for the parts of a product that are actually novel, and using boring, proven patterns everywhere else. A product that's "creative" in every single interaction is usually exhausting to use.