#51591B
Closest named color: Army Green (#4B5D16). oklch(44.3% 0.085 116.2), rgb(81, 89, 27).
Aa
White text reads best on this color (7.51:1).
About this color
#51591B is a dark, moderately saturated brown. In OKLCH its lightness is 44%, its chroma 0.085 and its hue 116°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Army Green (#4B5D16), ΔE 0.017 away. White text reads best on it, at 7.51:1.
| Hue family | Browns |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.085) |
| Temperature | in between |
| Nearest name | Army Green (#4B5D16) |
| Black text | 2.79:1 |
| White text | 7.51:1 |
Values
| HEX | #51591B |
| RGB | rgb(81, 89, 27) |
| HSL | hsl(68, 53%, 23%) |
| OKLCH | oklch(44.3% 0.085 116.2) |
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 #51591B | 7.51:1 | AAA | Lc -90.9 | Preferred for body text |
| Black text on #51591B | 2.79:1 | Fails | Lc 18.0 | Dividers and decoration only |
| #51591B text on white | 7.51:1 | AAA | Lc 86.0 | Fine for body text |
| #51591B text on black | 2.79:1 | Fails | Lc -16.0 | 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 800.
-
Step 50
50
#F5F6F1
oklch(97.1% 0.007 115.7)
-
Step 100
100
#E9EBE1
oklch(93.6% 0.013 115.8)
-
Step 200
200
#D8DCC7
oklch(88.6% 0.029 115.7)
-
Step 300
300
#BEC5A1
oklch(80.8% 0.05 116.5)
-
Step 400
400
#9DA76D
oklch(70.6% 0.08 116.5)
-
Step 500
500
#869145
oklch(63.1% 0.101 116.2)
-
Step 600
600
#707B24
oklch(55.6% 0.11 116.3)
-
Step 700
700
#5E6716
oklch(49% 0.102 115.9)
-
Step 800
800 (this color)
#51591B
oklch(44.3% 0.085 116.2)
-
Step 900
900
#404619
oklch(37.8% 0.066 116)
-
Step 950
950
#252910
oklch(27% 0.042 116.8)
#51591B 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) | #5F5413 | 0.025 |
| Deuteranopia (no green cones) | #5F551F | 0.027 |
| Tritanopia (no blue cones) | #56544C | 0.073 |
| Achromatopsia (no color) | #545454 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51591B
#51591B
oklch(44.3% 0.085 116.2)
- #58497D
#58497D
oklch(44.4% 0.085 296)
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 #51591B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Army Green #4B5D16 ΔE 0.017
- Camouflage Green #4B6113 ΔE 0.028
- Olive Brown #645403 ΔE 0.032
- Green Brown #544E03 ΔE 0.032
- Camo Green #526525 ΔE 0.036
- Greeny Brown #696006 ΔE 0.047
- Pine #2B5D34 ΔE 0.048
- Navy Green #35530A ΔE 0.049
Use #51591B 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.