#40D588
Closest named color: Seaweed (#18D17B). oklch(77.7% 0.167 156), rgb(64, 213, 136).
Aa
Black text reads best on this color (11.09:1).
About this color
#40D588 is a medium-light, vivid green. In OKLCH its lightness is 78%, its chroma 0.167 and its hue 156°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.025 away. Black text reads best on it, at 11.09:1.
| Hue family | Greens |
| Lightness | medium-light (78%) |
| Chroma | vivid (0.167) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 11.09:1 |
| White text | 1.89:1 |
Values
| HEX | #40D588 |
| RGB | rgb(64, 213, 136) |
| HSL | hsl(149, 64%, 54%) |
| OKLCH | oklch(77.7% 0.167 156) |
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 #40D588 | 1.89:1 | Fails | Lc -39.8 | Non-text elements, placeholder text |
| Black text on #40D588 | 11.09:1 | AAA | Lc 68.3 | Content text, not long reading |
| #40D588 text on white | 1.89:1 | Fails | Lc 35.6 | Non-text elements, placeholder text |
| #40D588 text on black | 11.09:1 | AAA | Lc -67.0 | Content text, not long reading |
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 300.
-
Step 50
50
#EAFAEF
oklch(97% 0.022 155.9)
-
Step 100
100
#D1F4DD
oklch(93.6% 0.048 156.6)
-
Step 200
200
#A7ECC0
oklch(88.5% 0.092 156)
-
Step 300
300 (this color)
#40D588
oklch(77.7% 0.167 156)
-
Step 400
400
#00BF71
oklch(70.7% 0.172 155.9)
-
Step 500
500
#00A460
oklch(63.2% 0.154 155.8)
-
Step 600
600
#008A50
oklch(55.7% 0.136 155.8)
-
Step 700
700
#007443
oklch(49.1% 0.119 156.1)
-
Step 800
800
#005F36
oklch(42.7% 0.103 156.1)
-
Step 900
900
#004F2C
oklch(37.6% 0.091 156.1)
-
Step 950
950
#002F18
oklch(26.8% 0.065 156.1)
#40D588 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) | #D4C483 | 0.150 |
| Deuteranopia (no green cones) | #C1B78D | 0.146 |
| Tritanopia (no blue cones) | #00D3C1 | 0.079 |
| Achromatopsia (no color) | #BCBCBC | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40D588
#40D588
oklch(77.7% 0.167 156)
- #F78ADE
#F78ADE
oklch(77.7% 0.166 336.2)
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 #40D588, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.025
- Emerald #06D6A0 ΔE 0.031
- Aqua Green #12E193 ΔE 0.032
- Weird Green #3AE57F ΔE 0.050
- Soft Green #6FC276 ΔE 0.054
- Greenblue #23C48B ΔE 0.054
- Algae Green #21C36F ΔE 0.058
- Dark Mint #48C072 ΔE 0.058
Use #40D588 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.