#66B021
Closest named color: Grass (#5CAC2D). oklch(68.3% 0.183 134), rgb(102, 176, 33).
Aa
Black text reads best on this color (7.79:1).
About this color
#66B021 is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.183 and its hue 134°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grass (#5CAC2D), ΔE 0.017 away. Black text reads best on it, at 7.79:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.183) |
| Temperature | in between |
| Nearest name | Grass (#5CAC2D) |
| Black text | 7.79:1 |
| White text | 2.69:1 |
Values
| HEX | #66B021 |
| RGB | rgb(102, 176, 33) |
| HSL | hsl(91, 68%, 41%) |
| OKLCH | oklch(68.3% 0.183 134) |
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 #66B021 | 2.69:1 | Fails | Lc -57.2 | Large or bold text, headings |
| Black text on #66B021 | 7.79:1 | AAA | Lc 52.0 | Large or bold text, headings |
| #66B021 text on white | 2.69:1 | Fails | Lc 52.0 | Large or bold text, headings |
| #66B021 text on black | 7.79:1 | AAA | Lc -49.9 | 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
#F1F8EE
oklch(97.1% 0.015 136.1)
-
Step 100
100
#E1EFD9
oklch(93.6% 0.033 133.9)
-
Step 200
200
#C8E3B9
oklch(88.5% 0.063 134.4)
-
Step 300
300
#A2D184
oklch(80.9% 0.115 133.9)
-
Step 400
400 (this color)
#66B021
oklch(68.3% 0.183 134)
-
Step 500
500
#579F00
oklch(63% 0.181 134)
-
Step 600
600
#488600
oklch(55.6% 0.16 134.1)
-
Step 700
700
#3C7100
oklch(49.2% 0.141 134)
-
Step 800
800
#305C00
oklch(42.6% 0.122 134)
-
Step 900
900
#274D00
oklch(37.7% 0.108 134.1)
-
Step 950
950
#152E00
oklch(27% 0.078 134)
#66B021 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) | #B7A100 | 0.107 |
| Deuteranopia (no green cones) | #AD9B32 | 0.108 |
| Tritanopia (no blue cones) | #65A996 | 0.135 |
| Achromatopsia (no color) | #9E9E9E | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B021
#66B021
oklch(68.3% 0.183 134)
- #C171E7
#C171E7
oklch(68.3% 0.183 313.8)
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 #66B021, closest first.
No curated palette has a color within ΔE 0.04 of #66B021.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grass #5CAC2D ΔE 0.017
- Leafy Green #51B73B ΔE 0.023
- Leaf Green #5CA904 ΔE 0.025
- Leaf #71AA34 ΔE 0.026
- Frog Green #58BC08 ΔE 0.038
- Dark Lime #84B701 ΔE 0.040
- Avocado Green #87A922 ΔE 0.040
- Medium Green #39AD48 ΔE 0.043
Use #66B021 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.