#C21D04
Closest named color: Scarlet (#BE0119). oklch(52.2% 0.2 31.1), rgb(194, 29, 4).
Aa
White text reads best on this color (6.04:1).
About this color
#C21D04 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.200 and its hue 31°. Its hue sits on the warm side of the wheel. The nearest named color is Scarlet (#BE0119), ΔE 0.025 away. White text reads best on it, at 6.04:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.200) |
| Temperature | warm |
| Nearest name | Scarlet (#BE0119) |
| Black text | 3.47:1 |
| White text | 6.04:1 |
Values
| HEX | #C21D04 |
| RGB | rgb(194, 29, 4) |
| HSL | hsl(8, 96%, 39%) |
| OKLCH | oklch(52.2% 0.2 31.1) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #C21D04 | 6.04:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #C21D04 | 3.47:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #C21D04 text on white | 6.04:1 | AA | Lc 78.2 | Fine for body text |
| #C21D04 text on black | 3.47:1 | AA large text | Lc -23.6 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#FEF2F0
oklch(97% 0.013 28.9)
-
Step 100
100
#FCE4DF
oklch(93.7% 0.027 31.7)
-
Step 200
200
#FBCDC4
oklch(88.6% 0.054 31)
-
Step 300
300
#F9A99A
oklch(80.9% 0.098 31)
-
Step 400
400
#F17762
oklch(70.7% 0.154 31.3)
-
Step 500
500
#E84B34
oklch(63% 0.197 31.3)
-
Step 600
600
#D41E02
oklch(55.6% 0.215 31.1)
-
Step 700
700 (this color)
#C21D04
oklch(52.2% 0.2 31.1)
-
Step 800
800
#951100
oklch(42.8% 0.166 31.1)
-
Step 900
900
#771B0E
oklch(37.7% 0.128 31.3)
-
Step 950
950
#46120A
oklch(26.9% 0.081 31.5)
#C21D04 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #574C00 | 0.215 |
| Deuteranopia (no green cones) | #7E6F00 | 0.191 |
| Tritanopia (no blue cones) | #D7001C | 0.044 |
| Achromatopsia (no color) | #636363 | 0.201 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C21D04
#C21D04
oklch(52.2% 0.2 31.1)
- #007787
#007787
oklch(52.2% 0.091 211)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #C21D04, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Scarlet #BE0119 ΔE 0.025
- Firebrick #B22222 ΔE 0.035
- Rusty Red #AF2F0D ΔE 0.038
- Lipstick Red #C0022F ΔE 0.039
- Rufous #AE2012 ΔE 0.041
- Sinopia #BB3E03 ΔE 0.042
- Cherry #CF0234 ΔE 0.047
- Rust Red #AA2704 ΔE 0.048
Use #C21D04 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.