色TheoryforWebDesign:APracticalGuide
無料オンライン色TheoryforWebDesign:APracticalGuide。ブラウザでデータを即座に処理。アップロード不要、登録不要、完全プライベート。
Local processingColor Theory for Web Design — A Practical Guide
The Color Wheel
The color wheel arranges hues in a circle (0° red at top, going clockwise). Click anywhere on the wheel below to pick a base hue, then explore the harmony schemes.
Selected hue: 210° · #267fd9
Harmony Schemes
Complementary: Two colors directly opposite on the color wheel (180° apart). High contrast and vibrancy — use sparingly for accents, not for large body areas.
WCAG Contrast (Quick Reference)
Contrast ratio = (L₁ + 0.05) / (L₂ + 0.05), where L is relative luminance (0.2126·R + 0.7152·G + 0.0722·B with gamma correction). Higher is better; 1:1 = no contrast, 21:1 = max (black on white).
| Level | Text size | Min ratio |
|---|---|---|
| AA | Normal | 4.5:1 |
| AA | Large (≥ 18pt or 14pt bold) | 3.0:1 |
| AAA | Normal | 7.0:1 |
| AAA | Large | 4.5:1 |
| UI components | Graphical objects / borders | 3.0:1 |
Color Psychology (Quick Reference)
| Hue | Range | Traits | Common use |
|---|---|---|---|
| Red | 0–15°, 345–360° | Energy, urgency, passion, danger | CTA buttons, sale badges, error states |
| Orange | 15–45° | Warmth, enthusiasm, playfulness | Highlights, food, youth brands |
| Yellow | 45–70° | Optimism, attention, caution | Warnings, highlights, highlights |
| Green | 70–165° | Growth, calm, success, nature | Success states, eco, finance |
| Cyan | 165–195° | Clarity, communication, tech | Info, links, modern UI |
| Blue | 195–255° | Trust, stability, professionalism | Banks, SaaS, primary actions |
| Purple | 255–290° | Luxury, creativity, mystery | Premium, creative, spiritual |
| Magenta | 290–345° | Boldness, femininity, innovation | Fashion, beauty, gradients |
How to Use
Enter your input above. The result updates automatically. Use the copy button to copy the result.
Privacy
All processing happens in your browser. Your data is never uploaded to any server.
FAQ
この色TheoryforWebDesign:APracticalGuideは無料ですか？
はい、完全に無料です。登録不要。
このツールはデータをアップロードしますか？
いいえ。すべての処理はブラウザでローカルに行われます。データはデバイスから離れません。