When to use

Accessible viz encodes values as redundant channels: position, pattern, label, not hue alone. Ishihara plates 1917; WCAG 2 contrast; Okabe–Ito palettes for deuteranopia.

In reports, ads and assignments it fits public dashboards, exams, print in grey, legal slides. Skip it when relying on red/green alone to mean bad/good.

Use when

• Use when 1 — public dashboards, exams, print in grey, legal slides
• Use when 2 — Excel or Google Sheets
• Use when 3 — PowerPoint
• Use when 4 — lab reports and poster boards
• Use when 5 — Meta, Google and retail print

Avoid when

• Avoid when 1 — relying on red/green alone to mean bad/good
• Avoid when 2 — 3-D, dual axes, rainbow scales
• Avoid when 3 — Undated numbers, undated time series
• Avoid when 4 — Four charts on one slide

Audiences

• Work — PowerPoint
• Ads — Meta, Google and retail print
• School — lab reports and poster boards

Accessible viz: honour redundant channels: position, pattern, label, not hue alone, and switch when relying on red/green alone to mean bad/good.

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