#A63738
Closest named color: Brown (#A52A2A). oklch(49.9% 0.146 23.6), rgb(166, 55, 56).
Aa
White text reads best on this color (6.51:1).
About this color
#A63738 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.146 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Brown (#A52A2A), ΔE 0.023 away. White text reads best on it, at 6.51:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.146) |
| Temperature | warm |
| Nearest name | Brown (#A52A2A) |
| Black text | 3.22:1 |
| White text | 6.51:1 |
Values
| HEX | #A63738 |
| RGB | rgb(166, 55, 56) |
| HSL | hsl(359, 50%, 43%) |
| OKLCH | oklch(49.9% 0.146 23.6) |
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 #A63738 | 6.51:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #A63738 | 3.22:1 | AA large text | Lc 22.7 | Dividers and decoration only |
| #A63738 text on white | 6.51:1 | AA | Lc 81.4 | Fine for body text |
| #A63738 text on black | 3.22:1 | AA large text | Lc -20.5 | 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
#F7E5E3
oklch(93.6% 0.02 25.2)
-
Step 200
200
#F2D0CD
oklch(88.5% 0.039 23.9)
-
Step 300
300
#EBAFAB
oklch(80.8% 0.071 23.1)
-
Step 400
400
#DE837E
oklch(70.6% 0.113 23.7)
-
Step 500
500
#D3615E
oklch(63.2% 0.145 23.6)
-
Step 600
600
#BE4444
oklch(55.6% 0.157 23.8)
-
Step 700
700 (this color)
#A63738
oklch(49.9% 0.146 23.6)
-
Step 800
800
#852D2D
oklch(42.8% 0.121 23.8)
-
Step 900
900
#6B2928
oklch(37.6% 0.095 23.6)
-
Step 950
950
#3F1918
oklch(27% 0.06 23.4)
#A63738 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) | #554F37 | 0.157 |
| Deuteranopia (no green cones) | #716735 | 0.145 |
| Tritanopia (no blue cones) | #B61C39 | 0.043 |
| Achromatopsia (no color) | #5E5E5E | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A63738
#A63738
oklch(49.9% 0.146 23.6)
- #007179
#007179
oklch(50% 0.085 203.4)
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 #A63738, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown #A52A2A ΔE 0.023
- Brick #A03623 ΔE 0.027
- Firebrick #B22222 ΔE 0.035
- Rusty Red #AF2F0D ΔE 0.038
- Rufous #AE2012 ΔE 0.040
- Rust Red #AA2704 ΔE 0.041
- Light Maroon #A24857 ΔE 0.044
- Russet #A13905 ΔE 0.045
Use #A63738 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.