#51A01B
Closest named color: Grassy Green (#419C03). oklch(63.1% 0.178 136.3), rgb(81, 160, 27).
Aa
Black text reads best on this color (6.39:1).
About this color
#51A01B is a medium-light, vivid green. In OKLCH its lightness is 63%, its chroma 0.178 and its hue 136°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grassy Green (#419C03), ΔE 0.021 away. Black text reads best on it, at 6.39:1.
| Hue family | Greens |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.178) |
| Temperature | in between |
| Nearest name | Grassy Green (#419C03) |
| Black text | 6.39:1 |
| White text | 3.28:1 |
Values
| HEX | #51A01B |
| RGB | rgb(81, 160, 27) |
| HSL | hsl(96, 71%, 37%) |
| OKLCH | oklch(63.1% 0.178 136.3) |
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 #51A01B | 3.28:1 | AA large text | Lc -65.3 | Content text, not long reading |
| Black text on #51A01B | 6.39:1 | AA | Lc 44.2 | Non-text elements, placeholder text |
| #51A01B text on white | 3.28:1 | AA large text | Lc 59.9 | Large or bold text, headings |
| #51A01B text on black | 6.39:1 | AA | Lc -41.9 | 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
#E2EEDE
oklch(93.6% 0.025 137.8)
-
Step 200
200
#CBE1C2
oklch(88.5% 0.048 136.5)
-
Step 300
300
#A7CE96
oklch(80.9% 0.087 136.4)
-
Step 400
400
#77B459
oklch(70.7% 0.139 136.3)
-
Step 500
500 (this color)
#51A01B
oklch(63.1% 0.178 136.3)
-
Step 600
600
#3F8800
oklch(55.7% 0.167 136.3)
-
Step 700
700
#347200
oklch(49.1% 0.147 136.3)
-
Step 800
800
#295D00
oklch(42.5% 0.127 136.3)
-
Step 900
900
#214E00
oklch(37.7% 0.113 136.4)
-
Step 950
950
#142E04
oklch(27% 0.074 136)
#51A01B 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) | #A69200 | 0.110 |
| Deuteranopia (no green cones) | #9C8B2C | 0.111 |
| Tritanopia (no blue cones) | #4D9A88 | 0.126 |
| Achromatopsia (no color) | #8E8E8E | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A01B
#51A01B
oklch(63.1% 0.178 136.3)
- #B261D0
#B261D0
oklch(63% 0.178 316.1)
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 #51A01B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grassy Green #419C03 ΔE 0.021
- Grass Green #3F9B0B ΔE 0.024
- Leaf Green #5CA904 ΔE 0.031
- Mid Green #50A747 ΔE 0.034
- Grass #5CAC2D ΔE 0.038
- Kelly Green #02AB2E ΔE 0.040
- Medium Green #39AD48 ΔE 0.041
- Leaf #71AA34 ΔE 0.049
Use #51A01B 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.