#51731B
Closest named color: Dark Olive Green (#556B2F). oklch(51.1% 0.12 128.7), rgb(81, 115, 27).
Aa
White text reads best on this color (5.50:1).
About this color
#51731B is a medium-dark, moderately saturated green. In OKLCH its lightness is 51%, its chroma 0.120 and its hue 129°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Olive Green (#556B2F), ΔE 0.035 away. White text reads best on it, at 5.50:1.
| Hue family | Greens |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.120) |
| Temperature | in between |
| Nearest name | Dark Olive Green (#556B2F) |
| Black text | 3.81:1 |
| White text | 5.50:1 |
Values
| HEX | #51731B |
| RGB | rgb(81, 115, 27) |
| HSL | hsl(83, 62%, 28%) |
| OKLCH | oklch(51.1% 0.12 128.7) |
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 #51731B | 5.50:1 | AA | Lc -82.6 | Fine for body text |
| Black text on #51731B | 3.81:1 | AA large text | Lc 26.8 | Dividers and decoration only |
| #51731B text on white | 5.50:1 | AA | Lc 77.3 | Fine for body text |
| #51731B text on black | 3.81:1 | AA large text | Lc -24.5 | 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 700.
-
Step 50
50
#F4F6F1
oklch(97% 0.007 124.4)
-
Step 100
100
#E6ECE0
oklch(93.5% 0.017 128.7)
-
Step 200
200
#D3DEC7
oklch(88.6% 0.033 128)
-
Step 300
300
#B5C8A1
oklch(80.8% 0.057 128.8)
-
Step 400
400
#8FAC6D
oklch(70.7% 0.093 128.7)
-
Step 500
500
#739744
oklch(63.1% 0.119 128.8)
-
Step 600
600
#5C8121
oklch(55.6% 0.129 128.5)
-
Step 700
700 (this color)
#51731B
oklch(51.1% 0.12 128.7)
-
Step 800
800
#3E5914
oklch(42.7% 0.1 128.7)
-
Step 900
900
#354918
oklch(37.6% 0.077 128.4)
-
Step 950
950
#1F2B0F
oklch(27% 0.05 128.5)
#51731B 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) | #796A0A | 0.061 |
| Deuteranopia (no green cones) | #746823 | 0.061 |
| Tritanopia (no blue cones) | #546E62 | 0.094 |
| Achromatopsia (no color) | #696969 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51731B
#51731B
oklch(51.1% 0.12 128.7)
- #7A519B
#7A519B
oklch(51.2% 0.121 308.3)
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 #51731B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Olive Green #556B2F ΔE 0.035
- Muddy Green #657432 ΔE 0.038
- Olive Green #677A04 ΔE 0.039
- Mud Green #606602 ΔE 0.039
- Browny Green #6F6C0A ΔE 0.044
- Murky Green #6C7A0E ΔE 0.044
- Brown Green #706C11 ΔE 0.046
- Camo Green #526525 ΔE 0.046
Use #51731B 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.