Chart Type for Multi-Variable Comparison. Keywords: radar, spider, multi-variable, attributes, dimensions, comparison. Best Chart: Radar / Spider Chart. Secondary Options: Parallel Coordinates, Grouped Bar. When to Use: Comparing multiple entities across the same fixed set of attributes (e.g., product feature comparison). When NOT to Use: Axes > 8 (unreadable); values need precise comparison (use grouped bar); audience unfamiliar with radar charts. Data Volume Threshold: 2–3 datasets maximum per chart; 5–8 axes; beyond 8 axes switch to parallel coordinates. Color Guidance: Single dataset: #0080FF at 20% fill. Multiple: distinct hues with 30% fill. Border: full opacity. Accessibility: B — Limit axes to 5–8. Always provide grouped bar chart alternative for precise reading.. A11y Fallback: Grouped bar chart as mandatory alternative; include raw data table. Library: Chart.js, Recharts, ApexCharts. Interactive Level: Hover + Toggle.