#A63537
Closest named color: Brown (#A52A2A). oklch(49.6% 0.149 23.4), rgb(166, 53, 55).
Aa
White text reads best on this color (6.59:1).
About this color
#A63537 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.149 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Brown (#A52A2A), ΔE 0.020 away. White text reads best on it, at 6.59:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.149) |
| Temperature | warm |
| Nearest name | Brown (#A52A2A) |
| Black text | 3.18:1 |
| White text | 6.59:1 |
Values
| HEX | #A63537 |
| RGB | rgb(166, 53, 55) |
| HSL | hsl(359, 52%, 43%) |
| OKLCH | oklch(49.6% 0.149 23.4) |
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 #A63537 | 6.59:1 | AA | Lc -86.8 | Fine for body text |
| Black text on #A63537 | 3.18:1 | AA large text | Lc 22.4 | Dividers and decoration only |
| #A63537 text on white | 6.59:1 | AA | Lc 81.6 | Fine for body text |
| #A63537 text on black | 3.18:1 | AA large text | Lc -20.2 | 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
#F8E5E3
oklch(93.7% 0.021 24.8)
-
Step 200
200
#F3D0CD
oklch(88.6% 0.04 23.7)
-
Step 300
300
#ECAFAB
oklch(80.9% 0.072 23)
-
Step 400
400
#DF837E
oklch(70.7% 0.114 23.7)
-
Step 500
500
#D4605E
oklch(63.2% 0.147 23.2)
-
Step 600
600
#BF4344
oklch(55.6% 0.159 23.4)
-
Step 700
700 (this color)
#A63537
oklch(49.6% 0.149 23.4)
-
Step 800
800
#852C2D
oklch(42.6% 0.122 23.3)
-
Step 900
900
#6C2928
oklch(37.8% 0.096 23.7)
-
Step 950
950
#3F1918
oklch(27% 0.06 23.4)
#A63537 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) | #544E36 | 0.159 |
| Deuteranopia (no green cones) | #706634 | 0.147 |
| Tritanopia (no blue cones) | #B61837 | 0.042 |
| Achromatopsia (no color) | #5D5D5D | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A63537
#A63537
oklch(49.6% 0.149 23.4)
- #007078
#007078
oklch(49.7% 0.085 203.5)
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 #A63537, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown #A52A2A ΔE 0.020
- Brick #A03623 ΔE 0.026
- Firebrick #B22222 ΔE 0.033
- Rufous #AE2012 ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.038
- Rust Red #AA2704 ΔE 0.039
- Auburn #9B2226 ΔE 0.043
- Rouge #AB1239 ΔE 0.044
Use #A63537 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.