#C03540
Closest named color: Dull Red (#BB3F3F). oklch(54.2% 0.175 21.1), rgb(192, 53, 64).
Aa
White text reads best on this color (5.49:1).
About this color
#C03540 is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.175 and its hue 21°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.018 away. White text reads best on it, at 5.49:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.175) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.82:1 |
| White text | 5.49:1 |
Values
| HEX | #C03540 |
| RGB | rgb(192, 53, 64) |
| HSL | hsl(355, 57%, 48%) |
| OKLCH | oklch(54.2% 0.175 21.1) |
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 #C03540 | 5.49:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #C03540 | 3.82:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #C03540 text on white | 5.49:1 | AA | Lc 76.2 | Fine for body text |
| #C03540 text on black | 3.82:1 | AA large text | Lc -25.6 | 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 600.
-
Step 50
50
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#F9E4E3
oklch(93.5% 0.023 20.9)
-
Step 200
200
#F5CECD
oklch(88.4% 0.044 19.8)
-
Step 300
300
#EFADAB
oklch(80.9% 0.078 20.9)
-
Step 400
400
#E47F7E
oklch(70.7% 0.125 21.3)
-
Step 500
500
#DA5A5D
oklch(63.2% 0.161 21.5)
-
Step 600
600 (this color)
#C03540
oklch(54.2% 0.175 21.1)
-
Step 700
700
#AA2A36
oklch(49.1% 0.164 20.8)
-
Step 800
800
#8A252D
oklch(42.7% 0.136 20.8)
-
Step 900
900
#6F2528
oklch(37.8% 0.105 21.3)
-
Step 950
950
#411718
oklch(27% 0.066 21.1)
#C03540 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) | #5C563F | 0.191 |
| Deuteranopia (no green cones) | #7F743C | 0.176 |
| Tritanopia (no blue cones) | #D3003A | 0.046 |
| Achromatopsia (no color) | #696969 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C03540
#C03540
oklch(54.2% 0.175 21.1)
- #007F85
#007F85
oklch(54.2% 0.092 200.6)
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 #C03540, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.018
- Dusty Red #B9484E ΔE 0.032
- Cherry #CF0234 ΔE 0.042
- Lipstick Red #C0022F ΔE 0.043
- Dark Rose #B5485D ΔE 0.044
- Ruby #CA0147 ΔE 0.047
- Rose Red #BE013C ΔE 0.047
- Firebrick #B22222 ΔE 0.049
Use #C03540 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.