#CA3437
Closest named color: Dull Red (#BB3F3F). oklch(55.7% 0.187 24.7), rgb(202, 52, 55).
Aa
White text reads best on this color (5.17:1).
About this color
#CA3437 is a medium-dark, vivid red. In OKLCH its lightness is 56%, its chroma 0.187 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.030 away. White text reads best on it, at 5.17:1.
| Hue family | Reds |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.187) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 4.05:1 |
| White text | 5.17:1 |
Values
| HEX | #CA3437 |
| RGB | rgb(202, 52, 55) |
| HSL | hsl(359, 59%, 50%) |
| OKLCH | oklch(55.7% 0.187 24.7) |
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 #CA3437 | 5.17:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #CA3437 | 4.05:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #CA3437 text on white | 5.17:1 | AA | Lc 74.3 | Content text, not long reading |
| #CA3437 text on black | 4.05:1 | AA large text | Lc -27.4 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FAE4E2
oklch(93.6% 0.024 23.9)
-
Step 200
200
#F7CECA
oklch(88.5% 0.047 24.6)
-
Step 300
300
#F2ACA6
oklch(80.9% 0.083 24.6)
-
Step 400
400
#E87C76
oklch(70.6% 0.134 24.4)
-
Step 500
500
#DE5652
oklch(63.1% 0.171 25)
-
Step 600
600 (this color)
#CA3437
oklch(55.7% 0.187 24.7)
-
Step 700
700
#AE2429
oklch(49.2% 0.174 24.9)
-
Step 800
800
#8D2123
oklch(42.7% 0.144 24.9)
-
Step 900
900
#712221
oklch(37.6% 0.112 24.9)
-
Step 950
950
#431514
oklch(27% 0.072 24.4)
#CA3437 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) | #615836 | 0.201 |
| Deuteranopia (no green cones) | #867932 | 0.185 |
| Tritanopia (no blue cones) | #DE0037 | 0.046 |
| Achromatopsia (no color) | #6D6D6D | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CA3437
#CA3437
oklch(55.7% 0.187 24.7)
- #00838E
#00838E
oklch(55.7% 0.095 205.2)
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 #CA3437, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.030
- Cherry #CF0234 ΔE 0.037
- Crimson #DC143C ΔE 0.041
- Dusty Red #B9484E ΔE 0.043
- Faded Red #D3494E ΔE 0.043
- Lipstick #D5174E ΔE 0.048
- Lipstick Red #C0022F ΔE 0.051
- Sinopia #BB3E03 ΔE 0.052
Use #CA3437 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.