#51AA40
Closest named color: Mid Green (#50A747). oklch(66% 0.167 140.6), rgb(81, 170, 64).
Aa
Black text reads best on this color (7.17:1).
About this color
#51AA40 is a medium-light, vivid green. In OKLCH its lightness is 66%, its chroma 0.167 and its hue 141°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Mid Green (#50A747), ΔE 0.012 away. Black text reads best on it, at 7.17:1.
| Hue family | Greens |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.167) |
| Temperature | in between |
| Nearest name | Mid Green (#50A747) |
| Black text | 7.17:1 |
| White text | 2.92:1 |
Values
| HEX | #51AA40 |
| RGB | rgb(81, 170, 64) |
| HSL | hsl(110, 45%, 46%) |
| OKLCH | oklch(66% 0.167 140.6) |
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 #51AA40 | 2.92:1 | Fails | Lc -60.7 | Content text, not long reading |
| Black text on #51AA40 | 7.17:1 | AAA | Lc 48.6 | Large or bold text, headings |
| #51AA40 text on white | 2.92:1 | Fails | Lc 55.4 | Large or bold text, headings |
| #51AA40 text on black | 7.17:1 | AAA | Lc -46.4 | 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
#F2F7F0
oklch(97% 0.011 136.6)
-
Step 100
100
#E2EEDF
oklch(93.6% 0.024 139.4)
-
Step 200
200
#CAE1C5
oklch(88.5% 0.045 140.1)
-
Step 300
300
#A4CE9C
oklch(80.8% 0.082 140.6)
-
Step 400
400
#71B465
oklch(70.6% 0.13 140.7)
-
Step 500
500 (this color)
#51AA40
oklch(66% 0.167 140.6)
-
Step 600
600
#238B00
oklch(55.6% 0.181 140.6)
-
Step 700
700
#1C7500
oklch(49.2% 0.16 140.5)
-
Step 800
800
#156000
oklch(42.7% 0.139 140.6)
-
Step 900
900
#1A4F0F
oklch(37.8% 0.109 140.6)
-
Step 950
950
#112E0B
oklch(26.9% 0.069 140.4)
#51AA40 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) | #AE9C34 | 0.114 |
| Deuteranopia (no green cones) | #A39449 | 0.116 |
| Tritanopia (no blue cones) | #47A593 | 0.110 |
| Achromatopsia (no color) | #979797 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AA40
#51AA40
oklch(66% 0.167 140.6)
- #BF6BD0
#BF6BD0
oklch(66% 0.168 320.7)
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 #51AA40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Green #50A747 ΔE 0.012
- Medium Green #39AD48 ΔE 0.016
- Grass #5CAC2D ΔE 0.018
- Dark Pastel Green #56AE57 ΔE 0.025
- Fern #63A950 ΔE 0.026
- Leaf Green #5CA904 ΔE 0.029
- Leaf #71AA34 ΔE 0.030
- Shamrock #01B44C ΔE 0.037
Use #51AA40 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.