#51B22D
Closest named color: Leafy Green (#51B73B). oklch(67.9% 0.19 138.8), rgb(81, 178, 45).
Aa
Black text reads best on this color (7.75:1).
About this color
#51B22D is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.190 and its hue 139°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Leafy Green (#51B73B), ΔE 0.015 away. Black text reads best on it, at 7.75:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.190) |
| Temperature | in between |
| Nearest name | Leafy Green (#51B73B) |
| Black text | 7.75:1 |
| White text | 2.70:1 |
Values
| HEX | #51B22D |
| RGB | rgb(81, 178, 45) |
| HSL | hsl(104, 60%, 44%) |
| OKLCH | oklch(67.9% 0.19 138.8) |
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 #51B22D | 2.70:1 | Fails | Lc -57.3 | Large or bold text, headings |
| Black text on #51B22D | 7.75:1 | AAA | Lc 51.9 | Large or bold text, headings |
| #51B22D text on white | 2.70:1 | Fails | Lc 52.1 | Large or bold text, headings |
| #51B22D text on black | 7.75:1 | AAA | Lc -49.7 | 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
#DFF0DA
oklch(93.7% 0.034 138.6)
-
Step 200
200
#C4E4BA
oklch(88.5% 0.066 138.3)
-
Step 300
300
#99D388
oklch(80.9% 0.118 138.7)
-
Step 400
400 (this color)
#51B22D
oklch(67.9% 0.19 138.8)
-
Step 500
500
#3CA300
oklch(63% 0.198 138.8)
-
Step 600
600
#318900
oklch(55.5% 0.174 138.8)
-
Step 700
700
#287400
oklch(49.2% 0.155 138.8)
-
Step 800
800
#1F5F00
oklch(42.7% 0.134 138.9)
-
Step 900
900
#194F00
oklch(37.7% 0.118 138.8)
-
Step 950
950
#0C2F00
oklch(26.9% 0.084 138.6)
#51B22D 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) | #B7A212 | 0.124 |
| Deuteranopia (no green cones) | #AB9A3B | 0.125 |
| Tritanopia (no blue cones) | #48AC98 | 0.130 |
| Achromatopsia (no color) | #9D9D9D | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B22D
#51B22D
oklch(67.9% 0.19 138.8)
- #C86BE1
#C86BE1
oklch(67.9% 0.19 318.8)
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 #51B22D, closest first.
No curated palette has a color within ΔE 0.04 of #51B22D.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leafy Green #51B73B ΔE 0.015
- Grass #5CAC2D ΔE 0.018
- Leaf Green #5CA904 ΔE 0.025
- Medium Green #39AD48 ΔE 0.032
- Shamrock #01B44C ΔE 0.034
- Frog Green #58BC08 ΔE 0.035
- Leaf #71AA34 ΔE 0.038
- Kelly Green #02AB2E ΔE 0.043
Use #51B22D 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.