#66B548
Closest named color: Turtle Green (#75B84F). oklch(69.9% 0.165 138.1), rgb(102, 181, 72).
Aa
Black text reads best on this color (8.26:1).
About this color
#66B548 is a medium-light, vivid green. In OKLCH its lightness is 70%, its chroma 0.165 and its hue 138°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Turtle Green (#75B84F), ΔE 0.020 away. Black text reads best on it, at 8.26:1.
| Hue family | Greens |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.165) |
| Temperature | in between |
| Nearest name | Turtle Green (#75B84F) |
| Black text | 8.26:1 |
| White text | 2.53:1 |
Values
| HEX | #66B548 |
| RGB | rgb(102, 181, 72) |
| HSL | hsl(103, 43%, 50%) |
| OKLCH | oklch(69.9% 0.165 138.1) |
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 #66B548 | 2.53:1 | Fails | Lc -54.6 | Large or bold text, headings |
| Black text on #66B548 | 8.26:1 | AAA | Lc 54.5 | Large or bold text, headings |
| #66B548 text on white | 2.53:1 | Fails | Lc 49.5 | Large or bold text, headings |
| #66B548 text on black | 8.26:1 | AAA | Lc -52.4 | 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
#F1F8EF
oklch(97.1% 0.014 138.7)
-
Step 100
100
#E0EFDC
oklch(93.6% 0.03 139.1)
-
Step 200
200
#C7E3BE
oklch(88.5% 0.058 138.1)
-
Step 300
300
#A0D18F
oklch(81% 0.104 137.8)
-
Step 400
400 (this color)
#66B548
oklch(69.9% 0.165 138.1)
-
Step 500
500
#41A300
oklch(63.2% 0.196 138.1)
-
Step 600
600
#368900
oklch(55.6% 0.172 138)
-
Step 700
700
#2C7300
oklch(49.1% 0.152 138.1)
-
Step 800
800
#235E00
oklch(42.6% 0.131 138)
-
Step 900
900
#1C4F00
oklch(37.8% 0.117 138)
-
Step 950
950
#0D2F00
oklch(26.9% 0.084 138.2)
#66B548 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) | #BAA73C | 0.107 |
| Deuteranopia (no green cones) | #B0A050 | 0.108 |
| Tritanopia (no blue cones) | #61AF9E | 0.115 |
| Achromatopsia (no color) | #A2A2A2 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B548
#66B548
oklch(69.9% 0.165 138.1)
- #C879DF
#C879DF
oklch(69.8% 0.165 318.3)
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 #66B548, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turtle Green #75B84F ΔE 0.020
- Leafy Green #51B73B ΔE 0.024
- Leaf #71AA34 ΔE 0.030
- Dark Pastel Green #56AE57 ΔE 0.032
- Boring Green #63B365 ΔE 0.033
- Grass #5CAC2D ΔE 0.033
- Fern #63A950 ΔE 0.038
- Cool Green #33B864 ΔE 0.038
Use #66B548 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.