#51A820
Closest named color: Leaf Green (#5CA904). oklch(65.2% 0.185 137.2), rgb(81, 168, 32).
Aa
Black text reads best on this color (6.97:1).
About this color
#51A820 is a medium-light, vivid green. In OKLCH its lightness is 65%, its chroma 0.185 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 0.012 away. Black text reads best on it, at 6.97:1.
| Hue family | Greens |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.185) |
| Temperature | in between |
| Nearest name | Leaf Green (#5CA904) |
| Black text | 6.97:1 |
| White text | 3.01:1 |
Values
| HEX | #51A820 |
| RGB | rgb(81, 168, 32) |
| HSL | hsl(98, 68%, 39%) |
| OKLCH | oklch(65.2% 0.185 137.2) |
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 #51A820 | 3.01:1 | AA large text | Lc -61.8 | Content text, not long reading |
| Black text on #51A820 | 6.97:1 | AA | Lc 47.6 | Large or bold text, headings |
| #51A820 text on white | 3.01:1 | AA large text | Lc 56.5 | Large or bold text, headings |
| #51A820 text on black | 6.97:1 | AA | Lc -45.3 | 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
#F2F7F0
oklch(97% 0.011 136.6)
-
Step 100
100
#E2EEDD
oklch(93.5% 0.026 136.3)
-
Step 200
200
#CAE1C1
oklch(88.4% 0.05 136.9)
-
Step 300
300
#A5CF95
oklch(81% 0.091 137.2)
-
Step 400
400
#73B557
oklch(70.7% 0.144 137.2)
-
Step 500
500 (this color)
#51A820
oklch(65.2% 0.185 137.2)
-
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
#1E4E00
oklch(37.5% 0.114 137.3)
-
Step 950
950
#122E03
oklch(26.9% 0.076 136.8)
#51A820 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) | #AE9900 | 0.117 |
| Deuteranopia (no green cones) | #A39230 | 0.117 |
| Tritanopia (no blue cones) | #4BA28F | 0.130 |
| Achromatopsia (no color) | #959595 | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A820
#51A820
oklch(65.2% 0.185 137.2)
- #BC65D9
#BC65D9
oklch(65.2% 0.185 317)
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 #51A820, closest first.
No curated palette has a color within ΔE 0.04 of #51A820.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leaf Green #5CA904 ΔE 0.012
- Grass #5CAC2D ΔE 0.018
- Medium Green #39AD48 ΔE 0.029
- Mid Green #50A747 ΔE 0.030
- Kelly Green #02AB2E ΔE 0.032
- Leaf #71AA34 ΔE 0.038
- Grassy Green #419C03 ΔE 0.040
- Leafy Green #51B73B ΔE 0.043
Use #51A820 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.