#51B737
Closest named color: Leafy Green (#51B73B). oklch(69.3% 0.19 139.9), rgb(81, 183, 55).
Aa
Black text reads best on this color (8.17:1).
About this color
#51B737 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.190 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 0.003 away. Black text reads best on it, at 8.17:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.190) |
| Temperature | in between |
| Nearest name | Leafy Green (#51B73B) |
| Black text | 8.17:1 |
| White text | 2.56:1 |
Values
| HEX | #51B737 |
| RGB | rgb(81, 183, 55) |
| HSL | hsl(108, 54%, 47%) |
| OKLCH | oklch(69.3% 0.19 139.9) |
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 #51B737 | 2.56:1 | Fails | Lc -55.0 | Large or bold text, headings |
| Black text on #51B737 | 8.17:1 | AAA | Lc 54.1 | Large or bold text, headings |
| #51B737 text on white | 2.56:1 | Fails | Lc 49.9 | Large or bold text, headings |
| #51B737 text on black | 8.17:1 | AAA | Lc -52.1 | 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
#C3E4BB
oklch(88.4% 0.065 139.6)
-
Step 300
300
#97D48A
oklch(81% 0.119 140.1)
-
Step 400
400 (this color)
#51B737
oklch(69.3% 0.19 139.9)
-
Step 500
500
#32A400
oklch(63% 0.202 139.9)
-
Step 600
600
#298A00
oklch(55.5% 0.178 139.9)
-
Step 700
700
#217400
oklch(49% 0.157 139.9)
-
Step 800
800
#196000
oklch(42.8% 0.138 140)
-
Step 900
900
#145000
oklch(37.8% 0.121 139.9)
-
Step 950
950
#083000
oklch(27.1% 0.087 140)
#51B737 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) | #BCA723 | 0.128 |
| Deuteranopia (no green cones) | #AF9E43 | 0.129 |
| Tritanopia (no blue cones) | #45B19D | 0.127 |
| Achromatopsia (no color) | #A2A2A2 | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B737
#51B737
oklch(69.3% 0.19 139.9)
- #CE6FE4
#CE6FE4
oklch(69.3% 0.189 319.8)
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 #51B737, closest first.
No curated palette has a color within ΔE 0.04 of #51B737.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leafy Green #51B73B ΔE 0.003
- Frog Green #58BC08 ΔE 0.027
- Grass #5CAC2D ΔE 0.030
- Shamrock Green #02C14D ΔE 0.034
- Shamrock #01B44C ΔE 0.036
- Leaf Green #5CA904 ΔE 0.039
- Medium Green #39AD48 ΔE 0.040
- Cool Green #33B864 ΔE 0.042
Use #51B737 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.