#40AE81
Closest named color: Dark Seafoam Green (#3EAF76). oklch(67.6% 0.121 162.8), rgb(64, 174, 129).
Aa
Black text reads best on this color (7.58:1).
About this color
#40AE81 is a medium-light, moderately saturated green. In OKLCH its lightness is 68%, its chroma 0.121 and its hue 163°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Seafoam Green (#3EAF76), ΔE 0.017 away. Black text reads best on it, at 7.58:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.121) |
| Temperature | in between |
| Nearest name | Dark Seafoam Green (#3EAF76) |
| Black text | 7.58:1 |
| White text | 2.76:1 |
Values
| HEX | #40AE81 |
| RGB | rgb(64, 174, 129) |
| HSL | hsl(155, 46%, 47%) |
| OKLCH | oklch(67.6% 0.121 162.8) |
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 #40AE81 | 2.76:1 | Fails | Lc -58.3 | Large or bold text, headings |
| Black text on #40AE81 | 7.58:1 | AAA | Lc 50.9 | Large or bold text, headings |
| #40AE81 text on white | 2.76:1 | Fails | Lc 53.1 | Large or bold text, headings |
| #40AE81 text on black | 7.58:1 | AAA | Lc -48.8 | 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
#F0F8F3
oklch(97.2% 0.011 158.8)
-
Step 100
100
#DEEFE6
oklch(93.7% 0.022 163)
-
Step 200
200
#C1E2D1
oklch(88.4% 0.042 163.1)
-
Step 300
300
#94D0B2
oklch(80.8% 0.075 162.4)
-
Step 400
400 (this color)
#40AE81
oklch(67.6% 0.121 162.8)
-
Step 500
500
#00A271
oklch(63% 0.136 163)
-
Step 600
600
#00895E
oklch(55.7% 0.121 162.5)
-
Step 700
700
#00734F
oklch(49.1% 0.106 163)
-
Step 800
800
#005E40
oklch(42.6% 0.092 163.1)
-
Step 900
900
#004F35
oklch(37.8% 0.082 162.9)
-
Step 950
950
#002F1E
oklch(27% 0.058 163)
#40AE81 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) | #ABA27E | 0.117 |
| Deuteranopia (no green cones) | #9C9784 | 0.114 |
| Tritanopia (no blue cones) | #00AEA2 | 0.049 |
| Achromatopsia (no color) | #9B9B9B | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40AE81
#40AE81
oklch(67.6% 0.121 162.8)
- #CA77AB
#CA77AB
oklch(67.5% 0.122 342.7)
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 #40AE81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Seafoam Green #3EAF76 ΔE 0.017
- Bluey Green #2BB179 ΔE 0.020
- Tea #65AB7C ΔE 0.028
- Greeny Blue #42B395 ΔE 0.028
- Dark Seafoam #1FB57A ΔE 0.029
- Medium Sea Green #3CB371 ΔE 0.030
- Seaweed Green #35AD6B ΔE 0.031
- Algae #54AC68 ΔE 0.032
Use #40AE81 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.