#66B554
Closest named color: Turtle Green (#75B84F). oklch(70% 0.154 140), rgb(102, 181, 84).
Aa
Black text reads best on this color (8.30:1).
About this color
#66B554 is a medium-light, vivid green. In OKLCH its lightness is 70%, its chroma 0.154 and its hue 140°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Turtle Green (#75B84F), ΔE 0.019 away. Black text reads best on it, at 8.30:1.
| Hue family | Greens |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.154) |
| Temperature | in between |
| Nearest name | Turtle Green (#75B84F) |
| Black text | 8.30:1 |
| White text | 2.52:1 |
Values
| HEX | #66B554 |
| RGB | rgb(102, 181, 84) |
| HSL | hsl(109, 40%, 52%) |
| OKLCH | oklch(70% 0.154 140) |
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 #66B554 | 2.52:1 | Fails | Lc -54.5 | Large or bold text, headings |
| Black text on #66B554 | 8.30:1 | AAA | Lc 54.6 | Large or bold text, headings |
| #66B554 text on white | 2.52:1 | Fails | Lc 49.4 | Large or bold text, headings |
| #66B554 text on black | 8.30:1 | AAA | Lc -52.6 | Large or bold text, headings |
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
#F1F8F0
oklch(97.2% 0.013 141.8)
-
Step 100
100
#E0EFDD
oklch(93.6% 0.029 140.5)
-
Step 200
200
#C7E2C1
oklch(88.4% 0.053 140)
-
Step 300
300
#A0D095
oklch(80.9% 0.095 139.8)
-
Step 400
400 (this color)
#66B554
oklch(70% 0.154 140)
-
Step 500
500
#37A411
oklch(63.2% 0.197 139.9)
-
Step 600
600
#288A00
oklch(55.5% 0.179 140)
-
Step 700
700
#217400
oklch(49% 0.157 139.9)
-
Step 800
800
#196000
oklch(42.8% 0.138 140)
-
Step 900
900
#135000
oklch(37.8% 0.122 140.1)
-
Step 950
950
#0B2F03
oklch(26.9% 0.081 140.1)
#66B554 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) | #BAA74B | 0.107 |
| Deuteranopia (no green cones) | #AFA05B | 0.107 |
| Tritanopia (no blue cones) | #5FB09F | 0.103 |
| Achromatopsia (no color) | #A3A3A3 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B554
#66B554
oklch(70% 0.154 140)
- #C87CD9
#C87CD9
oklch(70% 0.154 320.1)
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 #66B554, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turtle Green #75B84F ΔE 0.019
- Boring Green #63B365 ΔE 0.021
- Dark Pastel Green #56AE57 ΔE 0.027
- Asparagus #77AB56 ΔE 0.033
- Leafy Green #51B73B ΔE 0.034
- Leaf #71AA34 ΔE 0.034
- Cool Green #33B864 ΔE 0.034
- Fern #63A950 ΔE 0.034
Use #66B554 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.