#40C66F
Closest named color: Algae Green (#21C36F). oklch(73.4% 0.17 151.1), rgb(64, 198, 111).
Aa
Black text reads best on this color (9.52:1).
About this color
#40C66F is a medium-light, vivid green. In OKLCH its lightness is 73%, its chroma 0.170 and its hue 151°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Algae Green (#21C36F), ΔE 0.017 away. Black text reads best on it, at 9.52:1.
| Hue family | Greens |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.170) |
| Temperature | in between |
| Nearest name | Algae Green (#21C36F) |
| Black text | 9.52:1 |
| White text | 2.20:1 |
Values
| HEX | #40C66F |
| RGB | rgb(64, 198, 111) |
| HSL | hsl(141, 54%, 51%) |
| OKLCH | oklch(73.4% 0.17 151.1) |
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 #40C66F | 2.20:1 | Fails | Lc -47.7 | Large or bold text, headings |
| Black text on #40C66F | 9.52:1 | AAA | Lc 61.0 | Content text, not long reading |
| #40C66F text on white | 2.20:1 | Fails | Lc 43.0 | Non-text elements, placeholder text |
| #40C66F text on black | 9.52:1 | AAA | Lc -59.2 | 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
#EFF8F1
oklch(97% 0.013 152.6)
-
Step 100
100
#DCF0E0
oklch(93.6% 0.03 151.5)
-
Step 200
200
#BEE5C6
oklch(88.6% 0.059 151.1)
-
Step 300
300
#8CD49E
oklch(80.8% 0.105 151.4)
-
Step 400
400 (this color)
#40C66F
oklch(73.4% 0.17 151.1)
-
Step 500
500
#00A550
oklch(63.2% 0.17 151.1)
-
Step 600
600
#008B42
oklch(55.7% 0.15 151)
-
Step 700
700
#007537
oklch(49.2% 0.132 151.1)
-
Step 800
800
#00602C
oklch(42.8% 0.115 151.2)
-
Step 900
900
#005023
oklch(37.7% 0.102 150.9)
-
Step 950
950
#003013
oklch(27.1% 0.072 151.4)
#40C66F 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) | #C7B669 | 0.143 |
| Deuteranopia (no green cones) | #B6AA75 | 0.140 |
| Tritanopia (no blue cones) | #00C3B1 | 0.091 |
| Achromatopsia (no color) | #AFAFAF | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40C66F
#40C66F
oklch(73.4% 0.17 151.1)
- #E47DD9
#E47DD9
oklch(73.4% 0.169 331.2)
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 #40C66F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Algae Green #21C36F ΔE 0.017
- Dark Mint #48C072 ΔE 0.019
- Dark Mint Green #20C073 ΔE 0.025
- Seaweed #18D17B ΔE 0.030
- Greenblue #23C48B ΔE 0.038
- Soft Green #6FC276 ΔE 0.038
- Cool Green #33B864 ΔE 0.042
- Shamrock Green #02C14D ΔE 0.045
Use #40C66F 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.