總覽
計算兩種顏色之間的 WCAG 對比度，並判斷是否達到 AA / AAA 等級。完全本機執行。
Contrast Checker is a no-nonsense WCAG 2.1 contrast calculator that lives in your toolbar. Pick a foreground and a background — via the native color pickers or by typing a hex — and see the contrast ratio update in real time, alongside four pass/fail badges: - Normal text · AA (≥ 4.5:1) - Normal text · AAA (≥ 7:1) - Large text · AA (≥ 3:1) - Large text · AAA (≥ 4.5:1) Key features: - Real-time ratio update as you type or pick - Native browser color pickers for both foreground and background - Live preview pane that actually applies the colors so you see what your users would see - Swap-colors button for quickly auditing both directions - Your last-used colors are remembered locally - Pure WCAG 2.1 math (sRGB → linear → relative luminance → ratio) — no fancy "perceptual" tweaks Zero host permissions. Zero analytics. Zero remote code. The whole calculator ships inside the extension package.
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