JakobLaw [fact] v1.0.0

Jakob Nielsen's Law of the Internet User Experience: 'Users spend most of their time on other sites. So, users prefer your site to work the same way as all the other sites they already know.'

Users transfer expectations from other sites to yours — a search bar in the top-right, a logo in the top-left that links home, a hamburger icon meaning menu, a shopping cart icon meaning cart — so deviating from web-wide convention extracts a learning-cost tax that must be justified by clear benefit.

Confidence

proven

Applies To

• navigation patterns (top nav, sidebar conventions)
• icon semantics (hamburger = menu, magnifying glass = search, ⋯ = more)
• form patterns (email, password, sign-in placement)
• ecommerce conventions (cart icon, price display, checkout flow)
• deciding when to follow a convention vs differentiate

Counter Conditions

• Domain-expert tools (Linear, Figma, Adobe) often deliberately break web conventions because their target users invest time learning custom patterns for power benefit.
• Truly novel product categories may need to invent new conventions where no precedent serves the use case.
• Conventions evolve — yesterday's standard (skeuomorphic buttons, sidebar of links) becomes today's friction.
• Jakob's Law is descriptive, not prescriptive — it tells you the cost, not whether the cost is worth paying.

JakobLaw [fact] v1.0.0

Jakob Nielsen's Law of the Internet User Experience: 'Users spend most of their time on other sites. So, users prefer your site to work the same way as all the other sites they already know.'

Users transfer expectations from other sites to yours — a search bar in the top-right, a logo in the top-left that links home, a hamburger icon meaning menu, a shopping cart icon meaning cart — so deviating from web-wide convention extracts a learning-cost tax that must be justified by clear benefit.

Confidence

proven

Applies To

• navigation patterns (top nav, sidebar conventions)
• icon semantics (hamburger = menu, magnifying glass = search, ⋯ = more)
• form patterns (email, password, sign-in placement)
• ecommerce conventions (cart icon, price display, checkout flow)
• deciding when to follow a convention vs differentiate

Counter Conditions

• Domain-expert tools (Linear, Figma, Adobe) often deliberately break web conventions because their target users invest time learning custom patterns for power benefit.
• Truly novel product categories may need to invent new conventions where no precedent serves the use case.
• Conventions evolve — yesterday's standard (skeuomorphic buttons, sidebar of links) becomes today's friction.
• Jakob's Law is descriptive, not prescriptive — it tells you the cost, not whether the cost is worth paying.

Sources

Confidence

proven

Source

• Jakob Nielsen, 'End of Web Design' (NN/g, 2000) — original formulation
• Jakob Nielsen, 'Jakob's Law of Internet User Experience' (NN/g, restatement)
• Nielsen Norman Group ongoing research on UX consistency

Applies To

• navigation patterns (top nav, sidebar conventions)
• icon semantics (hamburger = menu, magnifying glass = search, ⋯ = more)
• form patterns (email, password, sign-in placement)
• ecommerce conventions (cart icon, price display, checkout flow)
• deciding when to follow a convention vs differentiate

Counter Conditions

• Domain-expert tools (Linear, Figma, Adobe) often deliberately break web conventions because their target users invest time learning custom patterns for power benefit.
• Truly novel product categories may need to invent new conventions where no precedent serves the use case.
• Conventions evolve — yesterday's standard (skeuomorphic buttons, sidebar of links) becomes today's friction.
• Jakob's Law is descriptive, not prescriptive — it tells you the cost, not whether the cost is worth paying.