#66C577
Closest named color: Soft Green (#6FC276). oklch(74.6% 0.144 148), rgb(102, 197, 119).
Aa
Black text reads best on this color (9.81:1).
About this color
#66C577 is a medium-light, vivid green. In OKLCH its lightness is 75%, its chroma 0.144 and its hue 148°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Soft Green (#6FC276), ΔE 0.010 away. Black text reads best on it, at 9.81:1.
| Hue family | Greens |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.144) |
| Temperature | in between |
| Nearest name | Soft Green (#6FC276) |
| Black text | 9.81:1 |
| White text | 2.13:1 |
Values
| HEX | #66C577 |
| RGB | rgb(102, 197, 119) |
| HSL | hsl(131, 45%, 59%) |
| OKLCH | oklch(74.6% 0.144 148) |
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 #66C577 | 2.13:1 | Fails | Lc -46.4 | Large or bold text, headings |
| Black text on #66C577 | 9.81:1 | AAA | Lc 62.2 | Content text, not long reading |
| #66C577 text on white | 2.13:1 | Fails | Lc 41.8 | Non-text elements, placeholder text |
| #66C577 text on black | 9.81:1 | AAA | Lc -60.5 | 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
#F0F8F1
oklch(97.1% 0.013 149.3)
-
Step 100
100
#DFEFE0
oklch(93.6% 0.026 147.1)
-
Step 200
200
#C4E3C7
oklch(88.6% 0.05 147.8)
-
Step 300
300
#99D1A0
oklch(80.9% 0.09 148)
-
Step 400
400 (this color)
#66C577
oklch(74.6% 0.144 148)
-
Step 500
500
#00A541
oklch(63% 0.182 148)
-
Step 600
600
#008B36
oklch(55.5% 0.161 148.1)
-
Step 700
700
#00752C
oklch(49% 0.142 148)
-
Step 800
800
#006023
oklch(42.7% 0.123 148.1)
-
Step 900
900
#00501C
oklch(37.6% 0.109 148.1)
-
Step 950
950
#02300F
oklch(27.1% 0.075 148.2)
#66C577 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) | #C7B771 | 0.116 |
| Deuteranopia (no green cones) | #B9AE7C | 0.113 |
| Tritanopia (no blue cones) | #55C2B2 | 0.083 |
| Achromatopsia (no color) | #B1B1B1 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66C577
#66C577
oklch(74.6% 0.144 148)
- #DD8ADA
#DD8ADA
oklch(74.6% 0.143 328.2)
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 #66C577, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Green #6FC276 ΔE 0.010
- Dark Mint #48C072 ΔE 0.029
- Greenblue #23C48B ΔE 0.042
- Algae Green #21C36F ΔE 0.043
- Dark Mint Green #20C073 ΔE 0.045
- Seaweed #18D17B ΔE 0.046
- Turtle Green #75B84F ΔE 0.046
- Boring Green #63B365 ΔE 0.051
Use #66C577 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.