#51A366
Closest named color: Muted Green (#5FA052). oklch(64.8% 0.122 150.2), rgb(81, 163, 102).
Aa
Black text reads best on this color (6.78:1).
About this color
#51A366 is a medium-light, moderately saturated green. In OKLCH its lightness is 65%, its chroma 0.122 and its hue 150°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Muted Green (#5FA052), ΔE 0.023 away. Black text reads best on it, at 6.78:1.
| Hue family | Greens |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.122) |
| Temperature | in between |
| Nearest name | Muted Green (#5FA052) |
| Black text | 6.78:1 |
| White text | 3.09:1 |
Values
| HEX | #51A366 |
| RGB | rgb(81, 163, 102) |
| HSL | hsl(135, 34%, 48%) |
| OKLCH | oklch(64.8% 0.122 150.2) |
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 #51A366 | 3.09:1 | AA large text | Lc -63.1 | Content text, not long reading |
| Black text on #51A366 | 6.78:1 | AA | Lc 46.3 | Large or bold text, headings |
| #51A366 text on white | 3.09:1 | AA large text | Lc 57.7 | Large or bold text, headings |
| #51A366 text on black | 6.78:1 | AA | Lc -44.0 | Non-text elements, placeholder text |
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
#F2F7F3
oklch(97.1% 0.007 151.9)
-
Step 100
100
#E2EDE4
oklch(93.5% 0.017 151.1)
-
Step 200
200
#CAE0CE
oklch(88.5% 0.034 150.8)
-
Step 300
300
#A6CCAD
oklch(80.9% 0.059 150.3)
-
Step 400
400
#74B281
oklch(70.8% 0.096 150)
-
Step 500
500 (this color)
#51A366
oklch(64.8% 0.122 150.2)
-
Step 600
600
#298847
oklch(55.6% 0.132 150)
-
Step 700
700
#197339
oklch(49% 0.122 150.3)
-
Step 800
800
#195E2F
oklch(42.7% 0.102 150)
-
Step 900
900
#1C4D2A
oklch(37.7% 0.08 150.2)
-
Step 950
950
#122D19
oklch(26.9% 0.05 150.3)
#51A366 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) | #A49762 | 0.102 |
| Deuteranopia (no green cones) | #988F6A | 0.100 |
| Tritanopia (no blue cones) | #40A194 | 0.067 |
| Achromatopsia (no color) | #929292 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A366
#51A366
oklch(64.8% 0.122 150.2)
- #B872B1
#B872B1
oklch(64.8% 0.121 330.5)
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 #51A366, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Green #5FA052 ΔE 0.023
- Algae #54AC68 ΔE 0.027
- Jade #1FA774 ΔE 0.029
- Off Green #6BA353 ΔE 0.030
- Seaweed Green #35AD6B ΔE 0.031
- Flat Green #699D4C ΔE 0.033
- Dark Seafoam Green #3EAF76 ΔE 0.034
- Dull Green #74A662 ΔE 0.037
Use #51A366 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.