#40B684
Closest named color: Dark Seafoam (#1FB57A). oklch(69.7% 0.129 161.7), rgb(64, 182, 132).
Aa
Black text reads best on this color (8.24:1).
About this color
#40B684 is a medium-light, moderately saturated green. In OKLCH its lightness is 70%, its chroma 0.129 and its hue 162°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Seafoam (#1FB57A), ΔE 0.022 away. Black text reads best on it, at 8.24:1.
| Hue family | Greens |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.129) |
| Temperature | in between |
| Nearest name | Dark Seafoam (#1FB57A) |
| Black text | 8.24:1 |
| White text | 2.54:1 |
Values
| HEX | #40B684 |
| RGB | rgb(64, 182, 132) |
| HSL | hsl(155, 48%, 48%) |
| OKLCH | oklch(69.7% 0.129 161.7) |
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 #40B684 | 2.54:1 | Fails | Lc -54.7 | Large or bold text, headings |
| Black text on #40B684 | 8.24:1 | AAA | Lc 54.4 | Large or bold text, headings |
| #40B684 text on white | 2.54:1 | Fails | Lc 49.6 | Large or bold text, headings |
| #40B684 text on black | 8.24:1 | AAA | Lc -52.4 | 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 400.
-
Step 50
50
#EFF8F3
oklch(97.1% 0.012 162.1)
-
Step 100
100
#DDEFE5
oklch(93.6% 0.023 161.7)
-
Step 200
200
#C0E3D0
oklch(88.5% 0.045 161.6)
-
Step 300
300
#91D1B0
oklch(80.8% 0.08 161.4)
-
Step 400
400 (this color)
#40B684
oklch(69.7% 0.129 161.7)
-
Step 500
500
#00A36E
oklch(63.2% 0.14 161.4)
-
Step 600
600
#00895C
oklch(55.7% 0.123 161.5)
-
Step 700
700
#00734D
oklch(49.1% 0.108 161.8)
-
Step 800
800
#005E3E
oklch(42.6% 0.094 161.6)
-
Step 900
900
#004F33
oklch(37.8% 0.084 161.3)
-
Step 950
950
#002F1D
oklch(27% 0.059 161.7)
#40B684 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) | #B3A981 | 0.123 |
| Deuteranopia (no green cones) | #A49E87 | 0.120 |
| Tritanopia (no blue cones) | #00B6A8 | 0.052 |
| Achromatopsia (no color) | #A2A2A2 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B684
#40B684
oklch(69.7% 0.129 161.7)
- #D37CB4
#D37CB4
oklch(69.7% 0.128 341.8)
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 #40B684, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Seafoam #1FB57A ΔE 0.022
- Bluey Green #2BB179 ΔE 0.023
- Dark Seafoam Green #3EAF76 ΔE 0.024
- Medium Sea Green #3CB371 ΔE 0.025
- Green Teal #0CB577 ΔE 0.028
- Greeny Blue #42B395 ΔE 0.028
- Green Blue #01C08D ΔE 0.029
- Tea #65AB7C ΔE 0.037
Use #40B684 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.