#66B545
Closest named color: Turtle Green (#75B84F). oklch(69.8% 0.167 137.7), rgb(102, 181, 69).
Aa
Black text reads best on this color (8.26:1).
About this color
#66B545 is a medium-light, vivid green. In OKLCH its lightness is 70%, its chroma 0.167 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 0.021 away. Black text reads best on it, at 8.26:1.
| Hue family | Greens |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.167) |
| Temperature | in between |
| Nearest name | Turtle Green (#75B84F) |
| Black text | 8.26:1 |
| White text | 2.54:1 |
Values
| HEX | #66B545 |
| RGB | rgb(102, 181, 69) |
| HSL | hsl(102, 45%, 49%) |
| OKLCH | oklch(69.8% 0.167 137.7) |
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 #66B545 | 2.54:1 | Fails | Lc -54.7 | Large or bold text, headings |
| Black text on #66B545 | 8.26:1 | AAA | Lc 54.4 | Large or bold text, headings |
| #66B545 text on white | 2.54:1 | Fails | Lc 49.6 | Large or bold text, headings |
| #66B545 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
#A0D18E
oklch(80.9% 0.105 137.5)
-
Step 400
400 (this color)
#66B545
oklch(69.8% 0.167 137.7)
-
Step 500
500
#44A200
oklch(63% 0.193 137.6)
-
Step 600
600
#388900
oklch(55.7% 0.171 137.7)
-
Step 700
700
#2E7300
oklch(49.1% 0.151 137.7)
-
Step 800
800
#245E00
oklch(42.6% 0.131 137.7)
-
Step 900
900
#1D4F00
oklch(37.8% 0.116 137.7)
-
Step 950
950
#0E2F00
oklch(27% 0.083 137.8)
#66B545 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) | #BBA738 | 0.108 |
| Deuteranopia (no green cones) | #B0A04E | 0.109 |
| Tritanopia (no blue cones) | #61AF9D | 0.116 |
| Achromatopsia (no color) | #A2A2A2 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B545
#66B545
oklch(69.8% 0.167 137.7)
- #C879E1
#C879E1
oklch(69.9% 0.167 317.7)
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 #66B545, closest first.
No curated palette has a color within ΔE 0.04 of #66B545.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turtle Green #75B84F ΔE 0.021
- Leafy Green #51B73B ΔE 0.022
- Leaf #71AA34 ΔE 0.030
- Grass #5CAC2D ΔE 0.032
- Dark Pastel Green #56AE57 ΔE 0.033
- Boring Green #63B365 ΔE 0.035
- Fern #63A950 ΔE 0.040
- Cool Green #33B864 ΔE 0.040
Use #66B545 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.