#663237
Closest named color: Purple Brown (#673A3F). oklch(38.7% 0.075 15.1), rgb(102, 50, 55).
Aa
White text reads best on this color (10.11:1).
About this color
#663237 is a dark, moderately saturated red. In OKLCH its lightness is 39%, its chroma 0.075 and its hue 15°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.021 away. White text reads best on it, at 10.11:1.
| Hue family | Reds |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.075) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.07:1 |
| White text | 10.11:1 |
Values
| HEX | #663237 |
| RGB | rgb(102, 50, 55) |
| HSL | hsl(354, 34%, 30%) |
| OKLCH | oklch(38.7% 0.075 15.1) |
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 #663237 | 10.11:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #663237 | 2.07:1 | Fails | Lc 10.8 | Not readable |
| #663237 text on white | 10.11:1 | AAA | Lc 93.2 | Preferred for body text |
| #663237 text on black | 2.07:1 | Fails | Lc -9.3 | Not readable |
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 900.
-
Step 50
50
#FAF3F4
oklch(97% 0.008 7.3)
-
Step 100
100
#F5E6E6
oklch(93.7% 0.016 17.4)
-
Step 200
200
#EDD1D2
oklch(88.4% 0.031 15.3)
-
Step 300
300
#E3B3B5
oklch(81% 0.056 15.6)
-
Step 400
400
#D2898E
oklch(70.6% 0.09 15.1)
-
Step 500
500
#C56B73
oklch(63.2% 0.114 15.2)
-
Step 600
600
#B0515B
oklch(55.7% 0.124 15.5)
-
Step 700
700
#97414B
oklch(49.2% 0.116 15.2)
-
Step 800
800
#7B363E
oklch(42.8% 0.096 14.9)
-
Step 900
900 (this color)
#663237
oklch(38.7% 0.075 15.1)
-
Step 950
950
#3A1C1F
oklch(26.9% 0.047 14.4)
#663237 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) | #3D3B37 | 0.080 |
| Deuteranopia (no green cones) | #494636 | 0.076 |
| Tritanopia (no blue cones) | #6F2C34 | 0.021 |
| Achromatopsia (no color) | #424242 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663237
#663237
oklch(38.7% 0.075 15.1)
- #004F4F
#004F4F
oklch(38.7% 0.066 194.8)
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 #663237, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.021
- Chestnut #742802 ΔE 0.059
- Brownish Purple #76424E ΔE 0.060
- Reddy Brown #6E1005 ΔE 0.072
- Wine Red #7B0323 ΔE 0.073
- Bordeaux #7B002C ΔE 0.076
- Merlot #730039 ΔE 0.080
- Blood #770001 ΔE 0.082
Use #663237 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.