Red

#ff0000

Pure, high-saturation blood red for sharp hierarchy

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About Red

Red is the red you notice instantly on a touchscreen when you've got dark UI behind it and you don't want that orange heat creeping in. This one lands hotter and more direct than , but it's not as signal-clean or tight as Left on Red. Compared with , it keeps more warmth in the undertone, so it doesn't read thin or bluish.

On-screen, it's high-visibility red for high-stakes moments that need urgency without turning into a warning light. I use it for critical alerts in logistics portals, redline action buttons in fintech admin panels, and category labels in industrial dashboards where dark shells and dense data make everything else look muted. It also holds up on product packaging and app banners when photography is cool-toned, because the warmth keeps the message from flattening.

If you pair it with orange-adjacent hues, it can start to blur with the broader family. For sharp separation, anchor it with deep charcoal or near-black so it stays unmistakably red.

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Contrast checker

WCAG 2.1 contrast ratios. AA requires 4.5:1 for normal text, 3:1 for large. AAA requires 7:1 / 4.5:1.

On White #ffffff

Aa
4.00:1FailAA Large

On Gray 100 #f5f5f5

Aa
3.67:1FailAA Large

On Gray 900 #18181b

Aa
4.43:1FailAA Large

On Black #000000

Aa
5.25:1AAAAA Large

Variations

Shades

Darker variations, created by mixing toward black.

Tints

Lighter variations, created by mixing toward white.

Tones

Muted variations, created by reducing saturation.

Hues

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Temperatures

Warm and cool shifts of this color.

Color harmonies

Complementary
Analogous
Triadic
Split Complementary
Tetradic

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