#51B12E
Closest named color: Grass (#5CAC2D). oklch(67.7% 0.188 138.9), rgb(81, 177, 46).
Aa
Black text reads best on this color (7.67:1).
About this color
#51B12E is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.188 and its hue 139°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grass (#5CAC2D), ΔE 0.016 away. Black text reads best on it, at 7.67:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.188) |
| Temperature | in between |
| Nearest name | Grass (#5CAC2D) |
| Black text | 7.67:1 |
| White text | 2.73:1 |
Values
| HEX | #51B12E |
| RGB | rgb(81, 177, 46) |
| HSL | hsl(104, 59%, 44%) |
| OKLCH | oklch(67.7% 0.188 138.9) |
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 #51B12E | 2.73:1 | Fails | Lc -57.8 | Large or bold text, headings |
| Black text on #51B12E | 7.67:1 | AAA | Lc 51.5 | Large or bold text, headings |
| #51B12E text on white | 2.73:1 | Fails | Lc 52.6 | Large or bold text, headings |
| #51B12E text on black | 7.67:1 | AAA | Lc -49.3 | 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 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
#C4E4BB
oklch(88.5% 0.065 138.8)
-
Step 300
300
#99D389
oklch(80.9% 0.117 139)
-
Step 400
400 (this color)
#51B12E
oklch(67.7% 0.188 138.9)
-
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
#0B2F00
oklch(26.9% 0.085 139)
#51B12E 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) | #B6A115 | 0.123 |
| Deuteranopia (no green cones) | #AA993B | 0.124 |
| Tritanopia (no blue cones) | #48AB98 | 0.129 |
| Achromatopsia (no color) | #9C9C9C | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B12E
#51B12E
oklch(67.7% 0.188 138.9)
- #C76BE0
#C76BE0
oklch(67.7% 0.188 318.7)
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 #51B12E, closest first.
No curated palette has a color within ΔE 0.04 of #51B12E.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grass #5CAC2D ΔE 0.016
- Leafy Green #51B73B ΔE 0.017
- Leaf Green #5CA904 ΔE 0.023
- Medium Green #39AD48 ΔE 0.029
- Shamrock #01B44C ΔE 0.033
- Leaf #71AA34 ΔE 0.036
- Frog Green #58BC08 ΔE 0.038
- Mid Green #50A747 ΔE 0.040
Use #51B12E 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.