#66D997
Closest named color: Emerald (#06D6A0). oklch(80.1% 0.142 156), rgb(102, 217, 151).
Aa
Black text reads best on this color (11.93:1).
About this color
#66D997 is a light, vivid green. In OKLCH its lightness is 80%, its chroma 0.142 and its hue 156°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.040 away. Black text reads best on it, at 11.93:1.
| Hue family | Greens |
| Lightness | light (80%) |
| Chroma | vivid (0.142) |
| Temperature | in between |
| Nearest name | Emerald (#06D6A0) |
| Black text | 11.93:1 |
| White text | 1.75:1 |
Values
| HEX | #66D997 |
| RGB | rgb(102, 217, 151) |
| HSL | hsl(146, 60%, 63%) |
| OKLCH | oklch(80.1% 0.142 156) |
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 #66D997 | 1.75:1 | Fails | Lc -35.9 | Non-text elements, placeholder text |
| Black text on #66D997 | 11.93:1 | AAA | Lc 71.9 | Content text, not long reading |
| #66D997 text on white | 1.75:1 | Fails | Lc 31.9 | Non-text elements, placeholder text |
| #66D997 text on black | 11.93:1 | AAA | Lc -70.8 | 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
#ECFAF0
oklch(97.2% 0.02 154.9)
-
Step 100
100
#D5F3DF
oklch(93.7% 0.041 156.3)
-
Step 200
200
#AFE9C4
oklch(88.4% 0.078 156.4)
-
Step 300
300 (this color)
#66D997
oklch(80.1% 0.142 156)
-
Step 400
400
#00BF71
oklch(70.7% 0.172 155.9)
-
Step 500
500
#00A460
oklch(63.2% 0.154 155.8)
-
Step 600
600
#008A50
oklch(55.7% 0.136 155.8)
-
Step 700
700
#007443
oklch(49.1% 0.119 156.1)
-
Step 800
800
#005F36
oklch(42.7% 0.103 156.1)
-
Step 900
900
#004F2C
oklch(37.6% 0.091 156.1)
-
Step 950
950
#002F18
oklch(26.8% 0.065 156.1)
#66D997 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) | #D8CA93 | 0.129 |
| Deuteranopia (no green cones) | #C8BF9B | 0.125 |
| Tritanopia (no blue cones) | #44D7C8 | 0.069 |
| Achromatopsia (no color) | #C3C3C3 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D997
#66D997
oklch(80.1% 0.142 156)
- #F799E1
#F799E1
oklch(80.1% 0.143 335.9)
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 #66D997, closest first.
No curated palette has a color within ΔE 0.04 of #66D997.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.040
- Aqua Green #12E193 ΔE 0.041
- Medium Aquamarine #66CDAA ΔE 0.049
- Aqua Marine #2EE8BB ΔE 0.052
- Seafoam Blue #78D1B6 ΔE 0.057
- Weird Green #3AE57F ΔE 0.058
- Seaweed #18D17B ΔE 0.060
- Soft Green #6FC276 ΔE 0.064
Use #66D997 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.