#51AA57
Closest named color: Dark Pastel Green (#56AE57). oklch(66.3% 0.147 145), rgb(81, 170, 87).
Aa
Black text reads best on this color (7.23:1).
About this color
#51AA57 is a medium-light, vivid green. In OKLCH its lightness is 66%, its chroma 0.147 and its hue 145°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Pastel Green (#56AE57), ΔE 0.013 away. Black text reads best on it, at 7.23:1.
| Hue family | Greens |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.147) |
| Temperature | in between |
| Nearest name | Dark Pastel Green (#56AE57) |
| Black text | 7.23:1 |
| White text | 2.90:1 |
Values
| HEX | #51AA57 |
| RGB | rgb(81, 170, 87) |
| HSL | hsl(124, 35%, 49%) |
| OKLCH | oklch(66.3% 0.147 145) |
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 #51AA57 | 2.90:1 | Fails | Lc -60.4 | Content text, not long reading |
| Black text on #51AA57 | 7.23:1 | AAA | Lc 49.0 | Large or bold text, headings |
| #51AA57 text on white | 2.90:1 | Fails | Lc 55.1 | Large or bold text, headings |
| #51AA57 text on black | 7.23:1 | AAA | Lc -46.7 | 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 500.
-
Step 50
50
#F2F7F2
oklch(97.1% 0.008 145.5)
-
Step 100
100
#E2EEE2
oklch(93.7% 0.02 145.4)
-
Step 200
200
#CAE1C9
oklch(88.6% 0.041 144.1)
-
Step 300
300
#A4CDA4
oklch(80.8% 0.072 144.9)
-
Step 400
400
#71B373
oklch(70.6% 0.114 144.9)
-
Step 500
500 (this color)
#51AA57
oklch(66.3% 0.147 145)
-
Step 600
600
#208A2F
oklch(55.6% 0.159 145)
-
Step 700
700
#0E7521
oklch(49.1% 0.148 145)
-
Step 800
800
#135F1E
oklch(42.6% 0.122 145)
-
Step 900
900
#194E1E
oklch(37.6% 0.096 145)
-
Step 950
950
#102E12
oklch(27% 0.062 144.9)
#51AA57 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) | #AD9D50 | 0.112 |
| Deuteranopia (no green cones) | #A1945D | 0.112 |
| Tritanopia (no blue cones) | #43A697 | 0.091 |
| Achromatopsia (no color) | #989898 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AA57
#51AA57
oklch(66.3% 0.147 145)
- #BF71C4
#BF71C4
oklch(66.3% 0.146 324.9)
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 #51AA57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Pastel Green #56AE57 ΔE 0.013
- Fern #63A950 ΔE 0.016
- Mid Green #50A747 ΔE 0.017
- Algae #54AC68 ΔE 0.021
- Seaweed Green #35AD6B ΔE 0.025
- Jade Green #2BAF6A ΔE 0.027
- Medium Green #39AD48 ΔE 0.028
- Off Green #6BA353 ΔE 0.028
Use #51AA57 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.