#A33739
Closest named color: Brown (#A52A2A). oklch(49.4% 0.143 23), rgb(163, 55, 57).
Aa
White text reads best on this color (6.63:1).
About this color
#A33739 is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.143 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Brown (#A52A2A), ΔE 0.022 away. White text reads best on it, at 6.63:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.143) |
| Temperature | warm |
| Nearest name | Brown (#A52A2A) |
| Black text | 3.16:1 |
| White text | 6.63:1 |
Values
| HEX | #A33739 |
| RGB | rgb(163, 55, 57) |
| HSL | hsl(359, 50%, 43%) |
| OKLCH | oklch(49.4% 0.143 23) |
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 #A33739 | 6.63:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #A33739 | 3.16:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #A33739 text on white | 6.63:1 | AA | Lc 81.9 | Fine for body text |
| #A33739 text on black | 3.16:1 | AA large text | Lc -20.0 | 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 700.
-
Step 50
50
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F7E5E4
oklch(93.6% 0.02 21.4)
-
Step 200
200
#F2D0CD
oklch(88.5% 0.039 23.9)
-
Step 300
300
#EAB0AC
oklch(80.9% 0.068 23.2)
-
Step 400
400
#DD8480
oklch(70.7% 0.11 23)
-
Step 500
500
#D16260
oklch(63.1% 0.141 23)
-
Step 600
600
#BC4647
oklch(55.6% 0.153 23)
-
Step 700
700 (this color)
#A33739
oklch(49.4% 0.143 23)
-
Step 800
800
#842E2F
oklch(42.8% 0.119 22.9)
-
Step 900
900
#6A2A2A
oklch(37.7% 0.092 22.5)
-
Step 950
950
#3E1919
oklch(26.9% 0.058 21.7)
#A33739 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) | #544E38 | 0.153 |
| Deuteranopia (no green cones) | #6F6536 | 0.141 |
| Tritanopia (no blue cones) | #B31E39 | 0.041 |
| Achromatopsia (no color) | #5C5C5C | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A33739
#A33739
oklch(49.4% 0.143 23)
- #006F77
#006F77
oklch(49.4% 0.084 203.5)
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 #A33739, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown #A52A2A ΔE 0.022
- Brick #A03623 ΔE 0.026
- Firebrick #B22222 ΔE 0.039
- Rusty Red #AF2F0D ΔE 0.042
- Auburn #9B2226 ΔE 0.042
- Rufous #AE2012 ΔE 0.042
- Rust Red #AA2704 ΔE 0.043
- Light Maroon #A24857 ΔE 0.044
Use #A33739 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.