#42CF8A
Closest named color: Seaweed (#18D17B). oklch(76.2% 0.156 157.6), rgb(66, 207, 138).
Aa
Black text reads best on this color (10.52:1).
About this color
#42CF8A is a medium-light, vivid green. In OKLCH its lightness is 76%, its chroma 0.156 and its hue 158°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.028 away. Black text reads best on it, at 10.52:1.
| Hue family | Greens |
| Lightness | medium-light (76%) |
| Chroma | vivid (0.156) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 10.52:1 |
| White text | 1.99:1 |
Values
| HEX | #42CF8A |
| RGB | rgb(66, 207, 138) |
| HSL | hsl(151, 59%, 54%) |
| OKLCH | oklch(76.2% 0.156 157.6) |
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 #42CF8A | 1.99:1 | Fails | Lc -42.6 | Non-text elements, placeholder text |
| Black text on #42CF8A | 10.52:1 | AAA | Lc 65.7 | Content text, not long reading |
| #42CF8A text on white | 1.99:1 | Fails | Lc 38.2 | Non-text elements, placeholder text |
| #42CF8A text on black | 10.52:1 | AAA | Lc -64.2 | 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
#EBFAF0
oklch(97.1% 0.021 156.8)
-
Step 100
100
#D2F4DE
oklch(93.7% 0.046 157)
-
Step 200
200
#A9EBC3
oklch(88.5% 0.086 157.5)
-
Step 300
300 (this color)
#42CF8A
oklch(76.2% 0.156 157.6)
-
Step 400
400
#00BE76
oklch(70.6% 0.166 157.6)
-
Step 500
500
#00A365
oklch(63% 0.148 157.8)
-
Step 600
600
#008954
oklch(55.5% 0.13 157.7)
-
Step 700
700
#007446
oklch(49.2% 0.116 157.5)
-
Step 800
800
#005F38
oklch(42.7% 0.101 157.3)
-
Step 900
900
#004F2E
oklch(37.6% 0.089 157.5)
-
Step 950
950
#002F1A
oklch(26.9% 0.063 158.2)
#42CF8A 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) | #CDBF86 | 0.143 |
| Deuteranopia (no green cones) | #BBB28E | 0.140 |
| Tritanopia (no blue cones) | #00CEBD | 0.071 |
| Achromatopsia (no color) | #B7B7B7 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42CF8A
#42CF8A
oklch(76.2% 0.156 157.6)
- #F088D5
#F088D5
oklch(76.3% 0.157 337.5)
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 #42CF8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.028
- Emerald #06D6A0 ΔE 0.029
- Greenblue #23C48B ΔE 0.037
- Soft Green #6FC276 ΔE 0.042
- Dark Mint #48C072 ΔE 0.044
- Algae Green #21C36F ΔE 0.047
- Aqua Green #12E193 ΔE 0.048
- Dark Mint Green #20C073 ΔE 0.051
Use #42CF8A 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.