#C4021B
Closest named color: Scarlet (#BE0119). oklch(51.7% 0.209 25.9), rgb(196, 2, 27).
Aa
White text reads best on this color (6.22:1).
About this color
#C4021B is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.209 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Scarlet (#BE0119), ΔE 0.013 away. White text reads best on it, at 6.22:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.209) |
| Temperature | warm |
| Nearest name | Scarlet (#BE0119) |
| Black text | 3.37:1 |
| White text | 6.22:1 |
Values
| HEX | #C4021B |
| RGB | rgb(196, 2, 27) |
| HSL | hsl(352, 98%, 39%) |
| OKLCH | oklch(51.7% 0.209 25.9) |
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 #C4021B | 6.22:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #C4021B | 3.37:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #C4021B text on white | 6.22:1 | AA | Lc 78.3 | Fine for body text |
| #C4021B text on black | 3.37:1 | AA large text | Lc -23.5 | 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
#FFF2F1
oklch(97.1% 0.014 22.8)
-
Step 100
100
#FDE3E0
oklch(93.6% 0.029 25.6)
-
Step 200
200
#FCCCC6
oklch(88.5% 0.055 26.5)
-
Step 300
300
#FBA79F
oklch(80.9% 0.101 25.5)
-
Step 400
400
#F5726A
oklch(70.6% 0.163 25.6)
-
Step 500
500
#ED4341
oklch(63.2% 0.207 25.9)
-
Step 600
600
#D8031F
oklch(55.6% 0.225 25.9)
-
Step 700
700 (this color)
#C4021B
oklch(51.7% 0.209 25.9)
-
Step 800
800
#970012
oklch(42.6% 0.173 25.8)
-
Step 900
900
#7A1517
oklch(37.8% 0.135 25.8)
-
Step 950
950
#480F0E
oklch(27% 0.086 25.9)
#C4021B 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) | #514818 | 0.232 |
| Deuteranopia (no green cones) | #7C6E0D | 0.208 |
| Tritanopia (no blue cones) | #D90013 | 0.044 |
| Achromatopsia (no color) | #616161 | 0.211 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C4021B
#C4021B
oklch(51.7% 0.209 25.9)
- #007681
#007681
oklch(51.7% 0.088 206.2)
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 #C4021B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Scarlet #BE0119 ΔE 0.013
- Lipstick Red #C0022F ΔE 0.020
- Cherry #CF0234 ΔE 0.032
- Firebrick #B22222 ΔE 0.036
- Rose Red #BE013C ΔE 0.037
- Rufous #AE2012 ΔE 0.045
- Ruby #CA0147 ΔE 0.049
- Rusty Red #AF2F0D ΔE 0.051
Use #C4021B 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.