#18B557
Closest named color: Shamrock (#01B44C). oklch(67.8% 0.18 150.1), rgb(24, 181, 87).
Aa
Black text reads best on this color (7.78:1).
About this color
#18B557 is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.180 and its hue 150°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Shamrock (#01B44C), ΔE 0.013 away. Black text reads best on it, at 7.78:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.180) |
| Temperature | in between |
| Nearest name | Shamrock (#01B44C) |
| Black text | 7.78:1 |
| White text | 2.69:1 |
Values
| HEX | #18B557 |
| RGB | rgb(24, 181, 87) |
| HSL | hsl(144, 77%, 40%) |
| OKLCH | oklch(67.8% 0.18 150.1) |
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 #18B557 | 2.69:1 | Fails | Lc -56.9 | Large or bold text, headings |
| Black text on #18B557 | 7.78:1 | AAA | Lc 52.3 | Large or bold text, headings |
| #18B557 text on white | 2.69:1 | Fails | Lc 51.7 | Large or bold text, headings |
| #18B557 text on black | 7.78:1 | AAA | Lc -50.2 | 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
#EFF8F0
oklch(97% 0.014 148.8)
-
Step 100
100
#DBF0DF
oklch(93.5% 0.032 151.2)
-
Step 200
200
#BDE5C4
oklch(88.4% 0.061 150.1)
-
Step 300
300
#8AD59A
oklch(80.8% 0.112 150.1)
-
Step 400
400 (this color)
#18B557
oklch(67.8% 0.18 150.1)
-
Step 500
500
#00A54C
oklch(63.1% 0.173 150.1)
-
Step 600
600
#008B3F
oklch(55.7% 0.153 150.2)
-
Step 700
700
#007534
oklch(49.2% 0.135 150.2)
-
Step 800
800
#006029
oklch(42.7% 0.118 150)
-
Step 900
900
#005021
oklch(37.7% 0.104 150)
-
Step 950
950
#003011
oklch(27% 0.074 150)
#18B557 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) | #B6A54F | 0.148 |
| Deuteranopia (no green cones) | #A6995E | 0.147 |
| Tritanopia (no blue cones) | #00B29F | 0.100 |
| Achromatopsia (no color) | #9D9D9D | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18B557
#18B557
oklch(67.8% 0.18 150.1)
- #D368CB
#D368CB
oklch(67.8% 0.18 330.2)
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 #18B557, closest first.
No curated palette has a color within ΔE 0.04 of #18B557.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Shamrock #01B44C ΔE 0.013
- Cool Green #33B864 ΔE 0.021
- Medium Green #39AD48 ΔE 0.023
- Jade Green #2BAF6A ΔE 0.034
- Dark Pastel Green #56AE57 ΔE 0.036
- Leafy Green #51B73B ΔE 0.036
- Shamrock Green #02C14D ΔE 0.039
- Green Teal #0CB577 ΔE 0.039
Use #18B557 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.