#51AD19
Closest named color: Leaf Green (#5CA904). oklch(66.5% 0.194 137.2), rgb(81, 173, 25).
Aa
Black text reads best on this color (7.34:1).
About this color
#51AD19 is a medium-light, vivid green. In OKLCH its lightness is 67%, its chroma 0.194 and its hue 137°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Leaf Green (#5CA904), ΔE 0.013 away. Black text reads best on it, at 7.34:1.
| Hue family | Greens |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.194) |
| Temperature | in between |
| Nearest name | Leaf Green (#5CA904) |
| Black text | 7.34:1 |
| White text | 2.86:1 |
Values
| HEX | #51AD19 |
| RGB | rgb(81, 173, 25) |
| HSL | hsl(97, 75%, 39%) |
| OKLCH | oklch(66.5% 0.194 137.2) |
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 #51AD19 | 2.86:1 | Fails | Lc -59.7 | Large or bold text, headings |
| Black text on #51AD19 | 7.34:1 | AAA | Lc 49.7 | Large or bold text, headings |
| #51AD19 text on white | 2.86:1 | Fails | Lc 54.4 | Large or bold text, headings |
| #51AD19 text on black | 7.34:1 | AAA | Lc -47.4 | 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 500.
-
Step 50
50
#F2F8EF
oklch(97.2% 0.013 134.9)
-
Step 100
100
#E1EEDD
oklch(93.5% 0.026 138.3)
-
Step 200
200
#C9E2C0
oklch(88.5% 0.053 137.4)
-
Step 300
300
#A4CF93
oklch(80.9% 0.094 137)
-
Step 400
400
#70B652
oklch(70.7% 0.152 137.2)
-
Step 500
500 (this color)
#51AD19
oklch(66.5% 0.194 137.2)
-
Step 600
600
#3A8800
oklch(55.5% 0.169 137.3)
-
Step 700
700
#307300
oklch(49.2% 0.15 137.3)
-
Step 800
800
#265E00
oklch(42.7% 0.13 137.2)
-
Step 900
900
#1F4E00
oklch(37.6% 0.114 137)
-
Step 950
950
#102F01
oklch(27.1% 0.081 137.3)
#51AD19 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) | #B39D00 | 0.123 |
| Deuteranopia (no green cones) | #A7962D | 0.122 |
| Tritanopia (no blue cones) | #4BA793 | 0.136 |
| Achromatopsia (no color) | #999999 | 0.194 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AD19
#51AD19
oklch(66.5% 0.194 137.2)
- #C266E0
#C266E0
oklch(66.5% 0.194 317.2)
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 #51AD19, closest first.
No curated palette has a color within ΔE 0.04 of #51AD19.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leaf Green #5CA904 ΔE 0.013
- Grass #5CAC2D ΔE 0.017
- Leafy Green #51B73B ΔE 0.031
- Medium Green #39AD48 ΔE 0.032
- Kelly Green #02AB2E ΔE 0.035
- Shamrock #01B44C ΔE 0.039
- Leaf #71AA34 ΔE 0.039
- Mid Green #50A747 ΔE 0.040
Use #51AD19 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.