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UX Atlas
Plate TOOL·031 · ToolGrid E4 · Rev. 2026-08-14

Lighthouse

Built into Chrome, covering performance, accessibility, SEO and best practices in one run.

ToolCraft conventionFoundational

Definition

An auditing tool that produces lab measurements for performance alongside automated accessibility and SEO checks. Its performance data is lab data, which differs from field data.

Craft convention. True because the industry converged on it. Breaking it costs familiarity, not correctness.

On this plate
  1. 1Definition
  2. 2Local chart
  3. 3Continue from here

Good for

  • Performance budgets
  • Quick combined audits
  • CI checks

Watch out for

Lab performance scores are not what users experience. Use field data from real users for decisions, and treat the accessibility score as partial coverage.

Local chart

TOOL·031 · Region VII · Grid E4

This entry and the entries it is stated to connect with. Each line is labelled with what the connection means.

Performance as User ExperienceFND·054 · OFTEN USED WITHSEO for Content ProductsWRT·007 · OFTEN USED WITHAccessibility AuditFLOW·012 · OFTEN USED WITH

Continue from here

Each link says what the connection is, so you can tell a principle from an alternative from a thing people mix this up with.

Often used with

These usually appear in the same screen or the same decision.

Nearby in the Atlas

Adjacent territory, found through shared tags rather than a stated link.

Accessibility InsightsNVDAVoiceOver