#51371B
Closest named color: Mud Brown (#60460F). oklch(36% 0.056 66.4), rgb(81, 55, 27).
Aa
White text reads best on this color (10.98:1).
About this color
#51371B is a dark, muted brown. In OKLCH its lightness is 36%, its chroma 0.056 and its hue 66°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.059 away. White text reads best on it, at 10.98:1.
| Hue family | Browns |
| Lightness | dark (36%) |
| Chroma | muted (0.056) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 1.91:1 |
| White text | 10.98:1 |
Values
| HEX | #51371B |
| RGB | rgb(81, 55, 27) |
| HSL | hsl(31, 50%, 21%) |
| OKLCH | oklch(36% 0.056 66.4) |
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 #51371B | 10.98:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #51371B | 1.91:1 | Fails | Lc 8.6 | Not readable |
| #51371B text on white | 10.98:1 | AAA | Lc 95.3 | Preferred for body text |
| #51371B text on black | 1.91:1 | Fails | Lc -7.4 | 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
#F8F5F2
oklch(97.2% 0.005 67.8)
-
Step 100
100
#F0E8E2
oklch(93.6% 0.012 59.6)
-
Step 200
200
#E4D6C9
oklch(88.4% 0.023 65.4)
-
Step 300
300
#D4BCA5
oklch(81% 0.042 66)
-
Step 400
400
#BE9974
oklch(70.8% 0.067 66.4)
-
Step 500
500
#AD7F4F
oklch(63.1% 0.086 66.4)
-
Step 600
600
#986832
oklch(55.7% 0.093 66.9)
-
Step 700
700
#825625
oklch(49.2% 0.087 66.1)
-
Step 800
800
#694620
oklch(42.6% 0.071 65.9)
-
Step 900
900 (this color)
#51371B
oklch(36% 0.056 66.4)
-
Step 950
950
#322313
oklch(27% 0.035 67.2)
#51371B 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) | #403918 | 0.033 |
| Deuteranopia (no green cones) | #463F1C | 0.031 |
| Tritanopia (no blue cones) | #583131 | 0.044 |
| Achromatopsia (no color) | #3C3C3C | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51371B
#51371B
oklch(36% 0.056 66.4)
- #234059
#234059
oklch(36.1% 0.056 246.2)
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 #51371B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.059
- Dark Olive #373E02 ΔE 0.062
- Charcoal Grey #3C4142 ΔE 0.063
- Purple Brown #673A3F ΔE 0.070
- Onyx #343A40 ΔE 0.071
- Chestnut #742802 ΔE 0.074
- Pakistan Green #283618 ΔE 0.075
- Green Brown #544E03 ΔE 0.079
Use #51371B 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.