#51B451
Closest named color: Dark Pastel Green (#56AE57). oklch(68.8% 0.166 143.5), rgb(81, 180, 81).
Aa
Black text reads best on this color (7.99:1).
About this color
#51B451 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.166 and its hue 144°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Pastel Green (#56AE57), ΔE 0.021 away. Black text reads best on it, at 7.99:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.166) |
| Temperature | in between |
| Nearest name | Dark Pastel Green (#56AE57) |
| Black text | 7.99:1 |
| White text | 2.62:1 |
Values
| HEX | #51B451 |
| RGB | rgb(81, 180, 81) |
| HSL | hsl(120, 40%, 51%) |
| OKLCH | oklch(68.8% 0.166 143.5) |
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 #51B451 | 2.62:1 | Fails | Lc -56.0 | Large or bold text, headings |
| Black text on #51B451 | 7.99:1 | AAA | Lc 53.1 | Large or bold text, headings |
| #51B451 text on white | 2.62:1 | Fails | Lc 50.9 | Large or bold text, headings |
| #51B451 text on black | 7.99:1 | AAA | Lc -51.0 | 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
#F0F8F0
oklch(97.1% 0.014 145.5)
-
Step 100
100
#DFEFDD
oklch(93.5% 0.029 142.2)
-
Step 200
200
#C3E4C1
oklch(88.6% 0.059 143.5)
-
Step 300
300
#98D295
oklch(80.8% 0.103 143.4)
-
Step 400
400 (this color)
#51B451
oklch(68.8% 0.166 143.5)
-
Step 500
500
#00A71A
oklch(63.2% 0.208 143.5)
-
Step 600
600
#008C14
oklch(55.5% 0.183 143.5)
-
Step 700
700
#007610
oklch(49.1% 0.161 143.5)
-
Step 800
800
#00610B
oklch(42.7% 0.141 143.5)
-
Step 900
900
#005107
oklch(37.7% 0.124 143.4)
-
Step 950
950
#013003
oklch(26.9% 0.087 143.3)
#51B451 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) | #B7A548 | 0.122 |
| Deuteranopia (no green cones) | #AA9C58 | 0.121 |
| Tritanopia (no blue cones) | #41AF9E | 0.105 |
| Achromatopsia (no color) | #A0A0A0 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B451
#51B451
oklch(68.8% 0.166 143.5)
- #CB73D5
#CB73D5
oklch(68.8% 0.166 323.4)
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 #51B451, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Pastel Green #56AE57 ΔE 0.021
- Cool Green #33B864 ΔE 0.023
- Leafy Green #51B73B ΔE 0.024
- Medium Green #39AD48 ΔE 0.029
- Boring Green #63B365 ΔE 0.031
- Grass #5CAC2D ΔE 0.031
- Fern #63A950 ΔE 0.033
- Shamrock #01B44C ΔE 0.034
Use #51B451 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.