#633F18
Closest named color: Mud Brown (#60460F). oklch(40.2% 0.073 64.9), rgb(99, 63, 24).
Aa
White text reads best on this color (9.31:1).
About this color
#633F18 is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.073 and its hue 65°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.024 away. White text reads best on it, at 9.31:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.073) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.25:1 |
| White text | 9.31:1 |
Values
| HEX | #633F18 |
| RGB | rgb(99, 63, 24) |
| HSL | hsl(31, 61%, 24%) |
| OKLCH | oklch(40.2% 0.073 64.9) |
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 #633F18 | 9.31:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #633F18 | 2.25:1 | Fails | Lc 12.7 | Not readable |
| #633F18 text on white | 9.31:1 | AAA | Lc 91.3 | Preferred for body text |
| #633F18 text on black | 2.25:1 | 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
#F9F4F0
oklch(97% 0.008 61.5)
-
Step 100
100
#F2E8DF
oklch(93.6% 0.016 64.7)
-
Step 200
200
#E8D6C5
oklch(88.6% 0.03 65.8)
-
Step 300
300
#DABA9C
oklch(80.9% 0.055 65.1)
-
Step 400
400
#C79565
oklch(70.7% 0.088 64.4)
-
Step 500
500
#B87A38
oklch(63.2% 0.112 64.8)
-
Step 600
600
#A36209
oklch(55.7% 0.122 65.3)
-
Step 700
700
#8A5100
oklch(49% 0.11 65.1)
-
Step 800
800
#714204
oklch(42.6% 0.094 64.9)
-
Step 900
900 (this color)
#633F18
oklch(40.2% 0.073 64.9)
-
Step 950
950
#36210C
oklch(27% 0.046 63.5)
#633F18 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) | #4B4213 | 0.047 |
| Deuteranopia (no green cones) | #534A19 | 0.042 |
| Tritanopia (no blue cones) | #6C3737 | 0.056 |
| Achromatopsia (no color) | #474747 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #633F18
#633F18
oklch(40.2% 0.073 64.9)
- #224C6D
#224C6D
oklch(40.3% 0.073 244.8)
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 #633F18, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.024
- Green Brown #544E03 ΔE 0.057
- Chestnut #742802 ΔE 0.058
- Purple Brown #673A3F ΔE 0.060
- Olive Brown #645403 ΔE 0.067
- Milk Chocolate #7F4E1E ΔE 0.072
- Medium Brown #7F5112 ΔE 0.078
- Rust Brown #8B3103 ΔE 0.081
Use #633F18 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.