#66C457
Closest named color: Turtle Green (#75B84F). oklch(73.8% 0.172 141), rgb(102, 196, 87).
Aa
Black text reads best on this color (9.59:1).
About this color
#66C457 is a medium-light, vivid green. In OKLCH its lightness is 74%, its chroma 0.172 and its hue 141°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Turtle Green (#75B84F), ΔE 0.033 away. Black text reads best on it, at 9.59:1.
| Hue family | Greens |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.172) |
| Temperature | in between |
| Nearest name | Turtle Green (#75B84F) |
| Black text | 9.59:1 |
| White text | 2.18:1 |
Values
| HEX | #66C457 |
| RGB | rgb(102, 196, 87) |
| HSL | hsl(112, 48%, 55%) |
| OKLCH | oklch(73.8% 0.172 141) |
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 #66C457 | 2.18:1 | Fails | Lc -47.5 | Large or bold text, headings |
| Black text on #66C457 | 9.59:1 | AAA | Lc 61.2 | Content text, not long reading |
| #66C457 text on white | 2.18:1 | Fails | Lc 42.8 | Non-text elements, placeholder text |
| #66C457 text on black | 9.59:1 | AAA | Lc -59.4 | 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
#F0F8EF
oklch(97.1% 0.015 142.2)
-
Step 100
100
#DFEFDC
oklch(93.5% 0.03 140.8)
-
Step 200
200
#C4E4BF
oklch(88.6% 0.06 141.3)
-
Step 300
300
#9AD290
oklch(80.8% 0.108 140.8)
-
Step 400
400 (this color)
#66C457
oklch(73.8% 0.172 141)
-
Step 500
500
#26A500
oklch(63% 0.207 141)
-
Step 600
600
#1E8B00
oklch(55.5% 0.183 141)
-
Step 700
700
#187500
oklch(49.1% 0.161 141)
-
Step 800
800
#126000
oklch(42.7% 0.14 141)
-
Step 900
900
#0D5000
oklch(37.6% 0.124 141)
-
Step 950
950
#053000
oklch(27% 0.089 141)
#66C457 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) | #C9B44C | 0.121 |
| Deuteranopia (no green cones) | #BCAC5F | 0.120 |
| Tritanopia (no blue cones) | #5CBEAC | 0.114 |
| Achromatopsia (no color) | #AFAFAF | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66C457
#66C457
oklch(73.8% 0.172 141)
- #DA82EB
#DA82EB
oklch(73.8% 0.172 321)
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 #66C457, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turtle Green #75B84F ΔE 0.033
- Apple #6ECB3C ΔE 0.034
- Dark Mint #48C072 ΔE 0.039
- Soft Green #6FC276 ΔE 0.039
- Algae Green #21C36F ΔE 0.043
- Dark Lime Green #7EBD01 ΔE 0.044
- Leafy Green #51B73B ΔE 0.047
- Seaweed #18D17B ΔE 0.049
Use #66C457 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.