#C03728
Closest named color: Dull Red (#BB3F3F). oklch(54.1% 0.176 30), rgb(192, 55, 40).
Aa
White text reads best on this color (5.49:1).
About this color
#C03728 is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.176 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.024 away. White text reads best on it, at 5.49:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.176) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.81:1 |
| White text | 5.49:1 |
Values
| HEX | #C03728 |
| RGB | rgb(192, 55, 40) |
| HSL | hsl(6, 66%, 45%) |
| OKLCH | oklch(54.1% 0.176 30) |
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 #C03728 | 5.49:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #C03728 | 3.81:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #C03728 text on white | 5.49:1 | AA | Lc 76.2 | Fine for body text |
| #C03728 text on black | 3.81:1 | AA large text | Lc -25.5 | 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 600.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#F9E5E1
oklch(93.7% 0.023 31.1)
-
Step 200
200
#F5CFC8
oklch(88.5% 0.044 30.2)
-
Step 300
300
#EFAEA2
oklch(80.9% 0.079 30.6)
-
Step 400
400
#E58070
oklch(70.7% 0.128 30.1)
-
Step 500
500
#DA5C4B
oklch(63.2% 0.162 30)
-
Step 600
600 (this color)
#C03728
oklch(54.1% 0.176 30)
-
Step 700
700
#AA2D1F
oklch(49.1% 0.164 30.2)
-
Step 800
800
#8A271C
oklch(42.7% 0.136 30)
-
Step 900
900
#6F261D
oklch(37.7% 0.106 29.8)
-
Step 950
950
#411712
oklch(26.9% 0.067 29.1)
#C03728 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) | #605625 | 0.186 |
| Deuteranopia (no green cones) | #827422 | 0.170 |
| Tritanopia (no blue cones) | #D40035 | 0.056 |
| Achromatopsia (no color) | #696969 | 0.177 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C03728
#C03728
oklch(54.1% 0.176 30)
- #007D8D
#007D8D
oklch(54% 0.094 210.3)
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 #C03728, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.024
- Sinopia #BB3E03 ΔE 0.028
- Rusty Red #AF2F0D ΔE 0.043
- Dusty Red #B9484E ΔE 0.043
- Brick Orange #C14A09 ΔE 0.043
- Firebrick #B22222 ΔE 0.045
- Scarlet #BE0119 ΔE 0.048
- Lipstick Red #C0022F ΔE 0.052
Use #C03728 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.