#66D491
Closest named color: Emerald (#06D6A0). oklch(78.8% 0.14 154.7), rgb(102, 212, 145).
Aa
Black text reads best on this color (11.39:1).
About this color
#66D491 is a light, vivid green. In OKLCH its lightness is 79%, its chroma 0.140 and its hue 155°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.038 away. Black text reads best on it, at 11.39:1.
| Hue family | Greens |
| Lightness | light (79%) |
| Chroma | vivid (0.140) |
| Temperature | in between |
| Nearest name | Emerald (#06D6A0) |
| Black text | 11.39:1 |
| White text | 1.84:1 |
Values
| HEX | #66D491 |
| RGB | rgb(102, 212, 145) |
| HSL | hsl(143, 56%, 62%) |
| OKLCH | oklch(78.8% 0.14 154.7) |
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 #66D491 | 1.84:1 | Fails | Lc -38.5 | Non-text elements, placeholder text |
| Black text on #66D491 | 11.39:1 | AAA | Lc 69.5 | Content text, not long reading |
| #66D491 text on white | 1.84:1 | Fails | Lc 34.4 | Non-text elements, placeholder text |
| #66D491 text on black | 11.39:1 | AAA | Lc -68.2 | 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
#ECF9F0
oklch(97% 0.018 155.8)
-
Step 100
100
#D6F2DE
oklch(93.5% 0.04 154.5)
-
Step 200
200
#B1E9C3
oklch(88.5% 0.077 154.9)
-
Step 300
300 (this color)
#66D491
oklch(78.8% 0.14 154.7)
-
Step 400
400
#00BF6D
oklch(70.7% 0.176 154.8)
-
Step 500
500
#00A45D
oklch(63.1% 0.157 154.8)
-
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)
#66D491 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) | #D4C58D | 0.126 |
| Deuteranopia (no green cones) | #C4BA95 | 0.123 |
| Tritanopia (no blue cones) | #48D2C2 | 0.069 |
| Achromatopsia (no color) | #BFBFBF | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D491
#66D491
oklch(78.8% 0.14 154.7)
- #F096DE
#F096DE
oklch(78.7% 0.14 334.5)
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 #66D491, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.038
- Medium Aquamarine #66CDAA ΔE 0.045
- Aqua Green #12E193 ΔE 0.046
- Soft Green #6FC276 ΔE 0.050
- Seaweed #18D17B ΔE 0.052
- Seafoam Blue #78D1B6 ΔE 0.058
- Weird Green #3AE57F ΔE 0.063
- Greenblue #23C48B ΔE 0.063
Use #66D491 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.