#51BC39
Closest named color: Leafy Green (#51B73B). oklch(70.6% 0.195 140.3), rgb(81, 188, 57).
Aa
Black text reads best on this color (8.60:1).
About this color
#51BC39 is a medium-light, vivid green. In OKLCH its lightness is 71%, its chroma 0.195 and its hue 140°. 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 8.60:1.
| Hue family | Greens |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.195) |
| Temperature | in between |
| Nearest name | Leafy Green (#51B73B) |
| Black text | 8.60:1 |
| White text | 2.44:1 |
Values
| HEX | #51BC39 |
| RGB | rgb(81, 188, 57) |
| HSL | hsl(109, 53%, 48%) |
| OKLCH | oklch(70.6% 0.195 140.3) |
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 #51BC39 | 2.44:1 | Fails | Lc -52.7 | Large or bold text, headings |
| Black text on #51BC39 | 8.60:1 | AAA | Lc 56.3 | Large or bold text, headings |
| #51BC39 text on white | 2.44:1 | Fails | Lc 47.7 | Large or bold text, headings |
| #51BC39 text on black | 8.60:1 | AAA | Lc -54.4 | 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 400.
-
Step 50
50
#F0F8EE
oklch(97% 0.016 139.4)
-
Step 100
100
#DEF0DA
oklch(93.6% 0.035 140)
-
Step 200
200
#C2E5BB
oklch(88.6% 0.068 140.4)
-
Step 300
300
#95D488
oklch(80.9% 0.122 140.2)
-
Step 400
400 (this color)
#51BC39
oklch(70.6% 0.195 140.3)
-
Step 500
500
#2EA500
oklch(63.2% 0.205 140.3)
-
Step 600
600
#258B00
oklch(55.7% 0.181 140.4)
-
Step 700
700
#1E7500
oklch(49.2% 0.159 140.3)
-
Step 800
800
#176000
oklch(42.8% 0.139 140.3)
-
Step 900
900
#125000
oklch(37.7% 0.122 140.2)
-
Step 950
950
#073000
oklch(27% 0.088 140.4)
#51BC39 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) | #C1AB25 | 0.132 |
| Deuteranopia (no green cones) | #B4A245 | 0.133 |
| Tritanopia (no blue cones) | #44B6A2 | 0.130 |
| Achromatopsia (no color) | #A6A6A6 | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BC39
#51BC39
oklch(70.6% 0.195 140.3)
- #D471EA
#D471EA
oklch(70.6% 0.195 320.1)
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 #51BC39, closest first.
No curated palette has a color within ΔE 0.04 of #51BC39.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leafy Green #51B73B ΔE 0.015
- Frog Green #58BC08 ΔE 0.021
- Shamrock Green #02C14D ΔE 0.028
- Dark Lime Green #7EBD01 ΔE 0.042
- Turtle Green #75B84F ΔE 0.043
- Grass #5CAC2D ΔE 0.043
- Shamrock #01B44C ΔE 0.044
- Dark Lime #84B701 ΔE 0.046
Use #51BC39 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.