Color Blindness (+3)

Color Blindness

• Never rely on color alone to distinguish data series
• Add pattern fills, different line styles (solid, dashed, dotted), or direct labels
• Test with a colorblind simulator (e.g., Coblis, Sim Daltonism)
• Use the colorblind-friendly palette: sns.color_palette("colorblind")

Screen Readers

• Include alt text describing the chart's key finding
• Provide a data table alternative alongside the visualization
• Use semantic titles and labels

General Accessibility

• Sufficient contrast between data elements and background
• Text size minimum 10pt for labels, 12pt for titles
• Avoid conveying information only through spatial position (add labels)
• Consider printing: does the chart work in black and white?

Accessibility Checklist

Before sharing a visualization:

• Chart works without color (patterns, labels, or line styles differentiate series)
• Text is readable at standard zoom level
• Title describes the insight, not just the data
• Axes are labeled with units
• Legend is clear and positioned without obscuring data
• Data source and date range are noted