#51B11D
Closest named color: Grass (#5CAC2D). oklch(67.6% 0.197 137.7), rgb(81, 177, 29).
Aa
Black text reads best on this color (7.65:1).
About this color
#51B11D is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.197 and its hue 138°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grass (#5CAC2D), ΔE 0.021 away. Black text reads best on it, at 7.65:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.197) |
| Temperature | in between |
| Nearest name | Grass (#5CAC2D) |
| Black text | 7.65:1 |
| White text | 2.74:1 |
Values
| HEX | #51B11D |
| RGB | rgb(81, 177, 29) |
| HSL | hsl(99, 72%, 40%) |
| OKLCH | oklch(67.6% 0.197 137.7) |
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 #51B11D | 2.74:1 | Fails | Lc -57.9 | Large or bold text, headings |
| Black text on #51B11D | 7.65:1 | AAA | Lc 51.4 | Large or bold text, headings |
| #51B11D text on white | 2.74:1 | Fails | Lc 52.6 | Large or bold text, headings |
| #51B11D text on black | 7.65:1 | AAA | Lc -49.2 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F8EE
oklch(97% 0.016 139.4)
-
Step 100
100
#DFF0D9
oklch(93.6% 0.035 137.5)
-
Step 200
200
#C4E4B9
oklch(88.4% 0.067 137.7)
-
Step 300
300
#99D384
oklch(80.8% 0.123 137.7)
-
Step 400
400 (this color)
#51B11D
oklch(67.6% 0.197 137.7)
-
Step 500
500
#44A200
oklch(63% 0.193 137.6)
-
Step 600
600
#388900
oklch(55.7% 0.171 137.7)
-
Step 700
700
#2E7300
oklch(49.1% 0.151 137.7)
-
Step 800
800
#245E00
oklch(42.6% 0.131 137.7)
-
Step 900
900
#1D4F00
oklch(37.8% 0.116 137.7)
-
Step 950
950
#0E2F00
oklch(27% 0.083 137.8)
#51B11D 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) | #B7A100 | 0.126 |
| Deuteranopia (no green cones) | #AB9930 | 0.126 |
| Tritanopia (no blue cones) | #49AA97 | 0.139 |
| Achromatopsia (no color) | #9C9C9C | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B11D
#51B11D
oklch(67.6% 0.197 137.7)
- #C768E4
#C768E4
oklch(67.5% 0.197 317.7)
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 #51B11D, closest first.
No curated palette has a color within ΔE 0.04 of #51B11D.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grass #5CAC2D ΔE 0.021
- Leaf Green #5CA904 ΔE 0.022
- Leafy Green #51B73B ΔE 0.022
- Frog Green #58BC08 ΔE 0.034
- Medium Green #39AD48 ΔE 0.036
- Shamrock #01B44C ΔE 0.038
- Kelly Green #02AB2E ΔE 0.041
- Leaf #71AA34 ΔE 0.041
Use #51B11D 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.