#42CA7E
Closest named color: Seaweed (#18D17B). oklch(74.7% 0.161 154.6), rgb(66, 202, 126).
Aa
Black text reads best on this color (9.98:1).
About this color
#42CA7E is a medium-light, vivid green. In OKLCH its lightness is 75%, its chroma 0.161 and its hue 155°. 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 9.98:1.
| Hue family | Greens |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.161) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 9.98:1 |
| White text | 2.10:1 |
Values
| HEX | #42CA7E |
| RGB | rgb(66, 202, 126) |
| HSL | hsl(146, 56%, 53%) |
| OKLCH | oklch(74.7% 0.161 154.6) |
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 #42CA7E | 2.10:1 | Fails | Lc -45.4 | Large or bold text, headings |
| Black text on #42CA7E | 9.98:1 | AAA | Lc 63.1 | Content text, not long reading |
| #42CA7E text on white | 2.10:1 | Fails | Lc 40.8 | Non-text elements, placeholder text |
| #42CA7E text on black | 9.98:1 | AAA | Lc -61.5 | 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 400.
-
Step 50
50
#EFF8F1
oklch(97% 0.013 152.6)
-
Step 100
100
#DCF0E1
oklch(93.6% 0.029 153.3)
-
Step 200
200
#BDE5C9
oklch(88.6% 0.057 154.6)
-
Step 300
300
#8BD4A4
oklch(80.9% 0.1 154.7)
-
Step 400
400 (this color)
#42CA7E
oklch(74.7% 0.161 154.6)
-
Step 500
500
#00A45C
oklch(63.1% 0.158 154.5)
-
Step 600
600
#008A4D
oklch(55.6% 0.138 154.7)
-
Step 700
700
#007440
oklch(49.1% 0.122 154.8)
-
Step 800
800
#005F33
oklch(42.6% 0.106 154.6)
-
Step 900
900
#004F2A
oklch(37.6% 0.093 154.9)
-
Step 950
950
#003017
oklch(27.1% 0.068 154.6)
#42CA7E 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) | #C9BA79 | 0.142 |
| Deuteranopia (no green cones) | #B8AE83 | 0.139 |
| Tritanopia (no blue cones) | #00C8B7 | 0.080 |
| Achromatopsia (no color) | #B3B3B3 | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42CA7E
#42CA7E
oklch(74.7% 0.161 154.6)
- #E983D6
#E983D6
oklch(74.7% 0.16 334.3)
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 #42CA7E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.025
- Dark Mint #48C072 ΔE 0.028
- Greenblue #23C48B ΔE 0.030
- Algae Green #21C36F ΔE 0.031
- Soft Green #6FC276 ΔE 0.034
- Dark Mint Green #20C073 ΔE 0.035
- Green Blue #01C08D ΔE 0.045
- Emerald #06D6A0 ΔE 0.045
Use #42CA7E 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.