#DD3739
Closest named color: Imperial Red (#E63946). oklch(59.3% 0.202 25.4), rgb(221, 55, 57).
Aa
Black text reads best on this color (4.67:1).
About this color
#DD3739 is a medium-dark, vivid red. In OKLCH its lightness is 59%, its chroma 0.202 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Imperial Red (#E63946), ΔE 0.023 away. Black text reads best on it, at 4.67:1.
| Hue family | Reds |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.202) |
| Temperature | warm |
| Nearest name | Imperial Red (#E63946) |
| Black text | 4.67:1 |
| White text | 4.48:1 |
Values
| HEX | #DD3739 |
| RGB | rgb(221, 55, 57) |
| HSL | hsl(359, 71%, 54%) |
| OKLCH | oklch(59.3% 0.202 25.4) |
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 #DD3739 | 4.48:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #DD3739 | 4.67:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #DD3739 text on white | 4.48:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #DD3739 text on black | 4.67:1 | AA | Lc -32.0 | Non-text elements, placeholder text |
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
#FEF3F1
oklch(97.2% 0.012 29.9)
-
Step 100
100
#FBE4E1
oklch(93.7% 0.026 26.5)
-
Step 200
200
#F9CDC8
oklch(88.5% 0.05 25.7)
-
Step 300
300
#F6AAA3
oklch(80.9% 0.091 25.1)
-
Step 400
400
#EE7971
oklch(70.8% 0.146 25.4)
-
Step 500
500
#E44F4B
oklch(63.1% 0.186 25.5)
-
Step 600
600 (this color)
#DD3739
oklch(59.3% 0.202 25.4)
-
Step 700
700
#B31520
oklch(49.1% 0.188 25.5)
-
Step 800
800
#91181D
oklch(42.6% 0.155 25.3)
-
Step 900
900
#751D1D
oklch(37.7% 0.122 25.2)
-
Step 950
950
#451312
oklch(27% 0.077 24.9)
#DD3739 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) | #696037 | 0.220 |
| Deuteranopia (no green cones) | #928433 | 0.201 |
| Tritanopia (no blue cones) | #F3003A | 0.048 |
| Achromatopsia (no color) | #777777 | 0.204 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #DD3739
#DD3739
oklch(59.3% 0.202 25.4)
- #008F9B
#008F9B
oklch(59.3% 0.101 205.2)
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 #DD3739, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Imperial Red #E63946 ΔE 0.023
- Faded Red #D3494E ΔE 0.031
- Crimson #DC143C ΔE 0.035
- Red Pantone #EF233C ΔE 0.036
- Tomato Red #EC2D01 ΔE 0.040
- Pale Red #D9544D ΔE 0.043
- Dark Coral #CF524E ΔE 0.044
- Vermillion #F4320C ΔE 0.051
Use #DD3739 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.