#18B528
Closest named color: Shamrock (#01B44C). oklch(67.3% 0.214 143.6), rgb(24, 181, 40).
Aa
Black text reads best on this color (7.67:1).
About this color
#18B528 is a medium-light, vivid green. In OKLCH its lightness is 67%, its chroma 0.214 and its hue 144°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Shamrock (#01B44C), ΔE 0.029 away. Black text reads best on it, at 7.67:1.
| Hue family | Greens |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.214) |
| Temperature | in between |
| Nearest name | Shamrock (#01B44C) |
| Black text | 7.67:1 |
| White text | 2.73:1 |
Values
| HEX | #18B528 |
| RGB | rgb(24, 181, 40) |
| HSL | hsl(126, 77%, 40%) |
| OKLCH | oklch(67.3% 0.214 143.6) |
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 #18B528 | 2.73:1 | Fails | Lc -57.4 | Large or bold text, headings |
| Black text on #18B528 | 7.67:1 | AAA | Lc 51.8 | Large or bold text, headings |
| #18B528 text on white | 2.73:1 | Fails | Lc 52.2 | Large or bold text, headings |
| #18B528 text on black | 7.67:1 | AAA | Lc -49.7 | 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
#EFF9EE
oklch(97.2% 0.018 142.8)
-
Step 100
100
#DBF1DA
oklch(93.6% 0.038 144.1)
-
Step 200
200
#BCE7BA
oklch(88.6% 0.076 143.8)
-
Step 300
300
#8AD787
oklch(80.9% 0.134 143.4)
-
Step 400
400 (this color)
#18B528
oklch(67.3% 0.214 143.6)
-
Step 500
500
#00A71C
oklch(63.2% 0.207 143.6)
-
Step 600
600
#008C16
oklch(55.5% 0.182 143.6)
-
Step 700
700
#007611
oklch(49.1% 0.161 143.6)
-
Step 800
800
#00610C
oklch(42.7% 0.14 143.6)
-
Step 900
900
#005108
oklch(37.7% 0.124 143.6)
-
Step 950
950
#003103
oklch(27.2% 0.089 143.6)
#18B528 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) | #B9A300 | 0.154 |
| Deuteranopia (no green cones) | #A99839 | 0.154 |
| Tritanopia (no blue cones) | #00B09B | 0.137 |
| Achromatopsia (no color) | #9C9C9C | 0.215 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18B528
#18B528
oklch(67.3% 0.214 143.6)
- #D25DDF
#D25DDF
oklch(67.2% 0.214 323.6)
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 #18B528, closest first.
No curated palette has a color within ΔE 0.04 of #18B528.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Shamrock #01B44C ΔE 0.029
- Kelly Green #02AB2E ΔE 0.031
- Leafy Green #51B73B ΔE 0.035
- Shamrock Green #02C14D ΔE 0.039
- Medium Green #39AD48 ΔE 0.042
- Frog Green #58BC08 ΔE 0.042
- Leaf Green #5CA904 ΔE 0.044
- Grass #5CAC2D ΔE 0.044
Use #18B528 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.