#40B542
Closest named color: Leafy Green (#51B73B). oklch(68.3% 0.187 143.4), rgb(64, 181, 66).
Aa
Black text reads best on this color (7.90:1).
About this color
#40B542 is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.187 and its hue 143°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Leafy Green (#51B73B), ΔE 0.014 away. Black text reads best on it, at 7.90:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.187) |
| Temperature | in between |
| Nearest name | Leafy Green (#51B73B) |
| Black text | 7.90:1 |
| White text | 2.65:1 |
Values
| HEX | #40B542 |
| RGB | rgb(64, 181, 66) |
| HSL | hsl(121, 48%, 48%) |
| OKLCH | oklch(68.3% 0.187 143.4) |
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 #40B542 | 2.65:1 | Fails | Lc -56.4 | Large or bold text, headings |
| Black text on #40B542 | 7.90:1 | AAA | Lc 52.8 | Large or bold text, headings |
| #40B542 text on white | 2.65:1 | Fails | Lc 51.3 | Large or bold text, headings |
| #40B542 text on black | 7.90:1 | AAA | Lc -50.6 | 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
#F0F8EF
oklch(97.1% 0.015 142.2)
-
Step 100
100
#DDF0DC
oklch(93.6% 0.033 143.9)
-
Step 200
200
#C0E5BE
oklch(88.5% 0.066 143.7)
-
Step 300
300
#92D48F
oklch(80.8% 0.117 143.4)
-
Step 400
400 (this color)
#40B542
oklch(68.3% 0.187 143.4)
-
Step 500
500
#00A719
oklch(63.2% 0.209 143.4)
-
Step 600
600
#008C13
oklch(55.5% 0.183 143.4)
-
Step 700
700
#00760F
oklch(49.1% 0.162 143.5)
-
Step 800
800
#00610A
oklch(42.7% 0.141 143.4)
-
Step 900
900
#005107
oklch(37.7% 0.124 143.4)
-
Step 950
950
#003103
oklch(27.2% 0.089 143.6)
#40B542 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) | #B9A534 | 0.136 |
| Deuteranopia (no green cones) | #AA9B4C | 0.135 |
| Tritanopia (no blue cones) | #26B09D | 0.118 |
| Achromatopsia (no color) | #9F9F9F | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B542
#40B542
oklch(68.3% 0.187 143.4)
- #CF6BDA
#CF6BDA
oklch(68.4% 0.186 323.5)
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 #40B542, closest first.
No curated palette has a color within ΔE 0.04 of #40B542.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leafy Green #51B73B ΔE 0.014
- Shamrock #01B44C ΔE 0.021
- Medium Green #39AD48 ΔE 0.026
- Grass #5CAC2D ΔE 0.028
- Cool Green #33B864 ΔE 0.033
- Shamrock Green #02C14D ΔE 0.034
- Dark Pastel Green #56AE57 ΔE 0.038
- Leaf Green #5CA904 ΔE 0.039
Use #40B542 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.