#C03701
Closest named color: Sinopia (#BB3E03). oklch(53.9% 0.181 36.7), rgb(192, 55, 1).
Aa
White text reads best on this color (5.54:1).
About this color
#C03701 is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.181 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.013 away. White text reads best on it, at 5.54:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.181) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.78:1 |
| White text | 5.54:1 |
Values
| HEX | #C03701 |
| RGB | rgb(192, 55, 1) |
| HSL | hsl(17, 99%, 38%) |
| OKLCH | oklch(53.9% 0.181 36.7) |
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 #C03701 | 5.54:1 | AA | Lc -81.7 | Fine for body text |
| Black text on #C03701 | 3.78:1 | AA large text | Lc 27.7 | Dividers and decoration only |
| #C03701 text on white | 5.54:1 | AA | Lc 76.4 | Fine for body text |
| #C03701 text on black | 3.78:1 | AA large text | Lc -25.4 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#F9E5DF
oklch(93.6% 0.023 37.4)
-
Step 200
200
#F5CFC5
oklch(88.4% 0.045 35.1)
-
Step 300
300
#F0AF9C
oklch(81% 0.081 36.9)
-
Step 400
400
#E58165
oklch(70.7% 0.13 36.5)
-
Step 500
500
#DB5D38
oklch(63.2% 0.167 36.9)
-
Step 600
600 (this color)
#C03701
oklch(53.9% 0.181 36.7)
-
Step 700
700
#AA2F00
oklch(49.1% 0.166 36.6)
-
Step 800
800
#8B2805
oklch(42.8% 0.14 36.8)
-
Step 900
900
#6F2711
oklch(37.7% 0.108 37)
-
Step 950
950
#42180C
oklch(27.1% 0.069 36.7)
#C03701 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) | #615500 | 0.186 |
| Deuteranopia (no green cones) | #837400 | 0.167 |
| Tritanopia (no blue cones) | #D40030 | 0.067 |
| Achromatopsia (no color) | #686868 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C03701
#C03701
oklch(53.9% 0.181 36.7)
- #007B92
#007B92
oklch(53.7% 0.096 216.9)
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 #C03701, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.013
- Brick Orange #C14A09 ΔE 0.033
- Rusty Red #AF2F0D ΔE 0.040
- Burnt Orange #C04E01 ΔE 0.041
- Dull Red #BB3F3F ΔE 0.043
- Burnt Siena #B75203 ΔE 0.050
- Firebrick #B22222 ΔE 0.052
- Cinnamon #AC4F06 ΔE 0.053
Use #C03701 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.