#51A331
Closest named color: Mid Green (#50A747). oklch(64% 0.169 138.3), rgb(81, 163, 49).
Aa
Black text reads best on this color (6.63:1).
About this color
#51A331 is a medium-light, vivid green. In OKLCH its lightness is 64%, its chroma 0.169 and its hue 138°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Mid Green (#50A747), ΔE 0.020 away. Black text reads best on it, at 6.63:1.
| Hue family | Greens |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.169) |
| Temperature | in between |
| Nearest name | Mid Green (#50A747) |
| Black text | 6.63:1 |
| White text | 3.16:1 |
Values
| HEX | #51A331 |
| RGB | rgb(81, 163, 49) |
| HSL | hsl(103, 54%, 42%) |
| OKLCH | oklch(64% 0.169 138.3) |
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 #51A331 | 3.16:1 | AA large text | Lc -63.9 | Content text, not long reading |
| Black text on #51A331 | 6.63:1 | AA | Lc 45.6 | Large or bold text, headings |
| #51A331 text on white | 3.16:1 | AA large text | Lc 58.5 | Large or bold text, headings |
| #51A331 text on black | 6.63:1 | AA | Lc -43.2 | 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
#F2F7F0
oklch(97% 0.011 136.6)
-
Step 100
100
#E2EEDF
oklch(93.6% 0.024 139.4)
-
Step 200
200
#CBE1C4
oklch(88.6% 0.046 138.1)
-
Step 300
300
#A6CE9A
oklch(80.9% 0.083 138.5)
-
Step 400
400
#75B460
oklch(70.7% 0.133 138.3)
-
Step 500
500 (this color)
#51A331
oklch(64% 0.169 138.3)
-
Step 600
600
#348900
oklch(55.6% 0.173 138.4)
-
Step 700
700
#2B7300
oklch(49% 0.152 138.2)
-
Step 800
800
#225F00
oklch(42.8% 0.133 138.3)
-
Step 900
900
#1E4E08
oklch(37.6% 0.11 138.4)
-
Step 950
950
#132E09
oklch(27% 0.069 138.4)
#51A331 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) | #A89520 | 0.110 |
| Deuteranopia (no green cones) | #9D8E3C | 0.111 |
| Tritanopia (no blue cones) | #4B9D8C | 0.117 |
| Achromatopsia (no color) | #919191 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A331
#51A331
oklch(64% 0.169 138.3)
- #B666CD
#B666CD
oklch(64% 0.168 318.3)
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 #51A331, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Green #50A747 ΔE 0.020
- Medium Green #39AD48 ΔE 0.030
- Grass #5CAC2D ΔE 0.030
- Leaf Green #5CA904 ΔE 0.030
- Grassy Green #419C03 ΔE 0.033
- Grass Green #3F9B0B ΔE 0.035
- Fern #63A950 ΔE 0.039
- Kelly Green #02AB2E ΔE 0.040
Use #51A331 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.