#663D17
Closest named color: Mud Brown (#60460F). oklch(40.2% 0.077 60.2), rgb(102, 61, 23).
Aa
White text reads best on this color (9.35:1).
About this color
#663D17 is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.077 and its hue 60°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.030 away. White text reads best on it, at 9.35:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.077) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.24:1 |
| White text | 9.35:1 |
Values
| HEX | #663D17 |
| RGB | rgb(102, 61, 23) |
| HSL | hsl(29, 63%, 25%) |
| OKLCH | oklch(40.2% 0.077 60.2) |
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 #663D17 | 9.35:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #663D17 | 2.24:1 | Fails | Lc 12.6 | Not readable |
| #663D17 text on white | 9.35:1 | AAA | Lc 91.4 | Preferred for body text |
| #663D17 text on black | 2.24:1 | Fails | Lc -11.0 | 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
#FAF4F0
oklch(97.1% 0.008 56.3)
-
Step 100
100
#F3E8DF
oklch(93.7% 0.017 62)
-
Step 200
200
#EAD5C4
oklch(88.6% 0.033 61.4)
-
Step 300
300
#DDB99B
oklch(81% 0.058 61.7)
-
Step 400
400
#CB9364
oklch(70.7% 0.092 60.5)
-
Step 500
500
#BD7736
oklch(63.2% 0.118 60.6)
-
Step 600
600
#A85E04
oklch(55.6% 0.128 60.5)
-
Step 700
700
#8F4E00
oklch(49.2% 0.115 60)
-
Step 800
800
#753F02
oklch(42.6% 0.099 59.7)
-
Step 900
900 (this color)
#663D17
oklch(40.2% 0.077 60.2)
-
Step 950
950
#38200B
oklch(27% 0.049 59.4)
#663D17 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) | #4A4112 | 0.055 |
| Deuteranopia (no green cones) | #534A17 | 0.050 |
| Tritanopia (no blue cones) | #703435 | 0.056 |
| Achromatopsia (no color) | #474747 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663D17
#663D17
oklch(40.2% 0.077 60.2)
- #184D6D
#184D6D
oklch(40.2% 0.077 239.6)
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 #663D17, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.030
- Chestnut #742802 ΔE 0.051
- Purple Brown #673A3F ΔE 0.058
- Green Brown #544E03 ΔE 0.064
- Milk Chocolate #7F4E1E ΔE 0.071
- Olive Brown #645403 ΔE 0.071
- Rust Brown #8B3103 ΔE 0.074
- Medium Brown #7F5112 ΔE 0.078
Use #663D17 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.