#42CE99
Closest named color: Emerald (#06D6A0). oklch(76.3% 0.142 163.7), rgb(66, 206, 153).
Aa
Black text reads best on this color (10.52:1).
About this color
#42CE99 is a medium-light, vivid green. In OKLCH its lightness is 76%, its chroma 0.142 and its hue 164°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.023 away. Black text reads best on it, at 10.52:1.
| Hue family | Greens |
| Lightness | medium-light (76%) |
| Chroma | vivid (0.142) |
| Temperature | in between |
| Nearest name | Emerald (#06D6A0) |
| Black text | 10.52:1 |
| White text | 1.99:1 |
Values
| HEX | #42CE99 |
| RGB | rgb(66, 206, 153) |
| HSL | hsl(157, 59%, 53%) |
| OKLCH | oklch(76.3% 0.142 163.7) |
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 #42CE99 | 1.99:1 | Fails | Lc -42.7 | Non-text elements, placeholder text |
| Black text on #42CE99 | 10.52:1 | AAA | Lc 65.7 | Content text, not long reading |
| #42CE99 text on white | 1.99:1 | Fails | Lc 38.3 | Non-text elements, placeholder text |
| #42CE99 text on black | 10.52:1 | AAA | Lc -64.1 | 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
#EBFAF2
oklch(97.2% 0.019 162.9)
-
Step 100
100
#D2F3E2
oklch(93.6% 0.041 163.2)
-
Step 200
200
#A9EACB
oklch(88.5% 0.078 163.7)
-
Step 300
300 (this color)
#42CE99
oklch(76.3% 0.142 163.7)
-
Step 400
400
#00BD86
oklch(70.7% 0.151 163.7)
-
Step 500
500
#00A273
oklch(63.1% 0.134 164)
-
Step 600
600
#008860
oklch(55.5% 0.118 164)
-
Step 700
700
#007350
oklch(49.2% 0.105 163.6)
-
Step 800
800
#005E41
oklch(42.7% 0.091 163.9)
-
Step 900
900
#004F36
oklch(37.9% 0.081 163.8)
-
Step 950
950
#002F1E
oklch(27% 0.058 163)
#42CE99 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) | #CABF96 | 0.139 |
| Deuteranopia (no green cones) | #B8B29C | 0.135 |
| Tritanopia (no blue cones) | #00CEBF | 0.053 |
| Achromatopsia (no color) | #B7B7B7 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42CE99
#42CE99
oklch(76.3% 0.142 163.7)
- #F08BC9
#F08BC9
oklch(76.3% 0.143 343.4)
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 #42CE99, closest first.
No curated palette has a color within ΔE 0.04 of #42CE99.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.023
- Greenblue #23C48B ΔE 0.036
- Medium Aquamarine #66CDAA ΔE 0.037
- Seaweed #18D17B ΔE 0.047
- Green Blue #01C08D ΔE 0.048
- Soft Green #6FC276 ΔE 0.048
- Dark Mint #48C072 ΔE 0.054
- Aqua Green #12E193 ΔE 0.058
Use #42CE99 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.