#42D688
Closest named color: Seaweed (#18D17B). oklch(78% 0.167 155.7), rgb(66, 214, 136).
Aa
Black text reads best on this color (11.20:1).
About this color
#42D688 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 0.027 away. Black text reads best on it, at 11.20:1.
| Hue family | Greens |
| Lightness | medium-light (78%) |
| Chroma | vivid (0.167) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 11.20:1 |
| White text | 1.87:1 |
Values
| HEX | #42D688 |
| RGB | rgb(66, 214, 136) |
| HSL | hsl(148, 64%, 55%) |
| OKLCH | oklch(78% 0.167 155.7) |
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 #42D688 | 1.87:1 | Fails | Lc -39.2 | Non-text elements, placeholder text |
| Black text on #42D688 | 11.20:1 | AAA | Lc 68.8 | Content text, not long reading |
| #42D688 text on white | 1.87:1 | Fails | Lc 35.0 | Non-text elements, placeholder text |
| #42D688 text on black | 11.20:1 | AAA | Lc -67.5 | 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
#D1F4DC
oklch(93.6% 0.049 155.4)
-
Step 200
200
#A7ECBF
oklch(88.5% 0.093 155.4)
-
Step 300
300 (this color)
#42D688
oklch(78% 0.167 155.7)
-
Step 400
400
#00BF70
oklch(70.7% 0.173 155.6)
-
Step 500
500
#00A45F
oklch(63.2% 0.155 155.5)
-
Step 600
600
#008A4F
oklch(55.7% 0.136 155.4)
-
Step 700
700
#007442
oklch(49.1% 0.12 155.6)
-
Step 800
800
#005F35
oklch(42.7% 0.104 155.6)
-
Step 900
900
#004F2B
oklch(37.6% 0.092 155.5)
-
Step 950
950
#003018
oklch(27.2% 0.067 155.5)
#42D688 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) | #D5C583 | 0.150 |
| Deuteranopia (no green cones) | #C3B88D | 0.147 |
| Tritanopia (no blue cones) | #00D4C2 | 0.080 |
| Achromatopsia (no color) | #BDBDBD | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42D688
#42D688
oklch(78% 0.167 155.7)
- #F88AE0
#F88AE0
oklch(77.9% 0.168 335.8)
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 #42D688, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.027
- Aqua Green #12E193 ΔE 0.030
- Emerald #06D6A0 ΔE 0.032
- Weird Green #3AE57F ΔE 0.047
- Soft Green #6FC276 ΔE 0.056
- Greenblue #23C48B ΔE 0.057
- Algae Green #21C36F ΔE 0.060
- Dark Mint #48C072 ΔE 0.061
Use #42D688 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.