#CA3738
Closest named color: Dull Red (#BB3F3F). oklch(56% 0.184 25.1), rgb(202, 55, 56).
Aa
White text reads best on this color (5.10:1).
About this color
#CA3738 is a medium-dark, vivid red. In OKLCH its lightness is 56%, its chroma 0.184 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.029 away. White text reads best on it, at 5.10:1.
| Hue family | Reds |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.184) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 4.11:1 |
| White text | 5.10:1 |
Values
| HEX | #CA3738 |
| RGB | rgb(202, 55, 56) |
| HSL | hsl(360, 58%, 50%) |
| OKLCH | oklch(56% 0.184 25.1) |
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 #CA3738 | 5.10:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #CA3738 | 4.11:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #CA3738 text on white | 5.10:1 | AA | Lc 73.9 | Content text, not long reading |
| #CA3738 text on black | 4.11:1 | AA large text | Lc -27.8 | 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
#FAE4E2
oklch(93.6% 0.024 23.9)
-
Step 200
200
#F6CECA
oklch(88.4% 0.046 24.8)
-
Step 300
300
#F2ACA6
oklch(80.9% 0.083 24.6)
-
Step 400
400
#E87D76
oklch(70.7% 0.133 24.9)
-
Step 500
500
#DD5752
oklch(63.1% 0.169 25.3)
-
Step 600
600 (this color)
#CA3738
oklch(56% 0.184 25.1)
-
Step 700
700
#AD2629
oklch(49.1% 0.171 25.2)
-
Step 800
800
#8C2223
oklch(42.6% 0.142 25.1)
-
Step 900
900
#712321
oklch(37.7% 0.111 25.4)
-
Step 950
950
#431614
oklch(27.1% 0.07 25.4)
#CA3738 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) | #625A36 | 0.199 |
| Deuteranopia (no green cones) | #877A33 | 0.182 |
| Tritanopia (no blue cones) | #DE0039 | 0.049 |
| Achromatopsia (no color) | #6E6E6E | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CA3738
#CA3738
oklch(56% 0.184 25.1)
- #00848F
#00848F
oklch(56% 0.096 205.1)
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 #CA3738, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.029
- Faded Red #D3494E ΔE 0.040
- Dusty Red #B9484E ΔE 0.041
- Cherry #CF0234 ΔE 0.041
- Crimson #DC143C ΔE 0.043
- Dark Coral #CF524E ΔE 0.049
- Lipstick #D5174E ΔE 0.050
- Sinopia #BB3E03 ΔE 0.051
Use #CA3738 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.