#18B553
Closest named color: Shamrock (#01B44C). oklch(67.7% 0.184 149.3), rgb(24, 181, 83).
Aa
Black text reads best on this color (7.77:1).
About this color
#18B553 is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.184 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Shamrock (#01B44C), ΔE 0.009 away. Black text reads best on it, at 7.77:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.184) |
| Temperature | in between |
| Nearest name | Shamrock (#01B44C) |
| Black text | 7.77:1 |
| White text | 2.70:1 |
Values
| HEX | #18B553 |
| RGB | rgb(24, 181, 83) |
| HSL | hsl(143, 77%, 40%) |
| OKLCH | oklch(67.7% 0.184 149.3) |
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 #18B553 | 2.70:1 | Fails | Lc -57.0 | Large or bold text, headings |
| Black text on #18B553 | 7.77:1 | AAA | Lc 52.2 | Large or bold text, headings |
| #18B553 text on white | 2.70:1 | Fails | Lc 51.8 | Large or bold text, headings |
| #18B553 text on black | 7.77:1 | AAA | Lc -50.1 | 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
#EFF9F0
oklch(97.2% 0.016 148.4)
-
Step 100
100
#DBF1DE
oklch(93.7% 0.034 149.3)
-
Step 200
200
#BDE6C3
oklch(88.6% 0.064 149.1)
-
Step 300
300
#8AD698
oklch(81% 0.115 149.1)
-
Step 400
400 (this color)
#18B553
oklch(67.7% 0.184 149.3)
-
Step 500
500
#00A548
oklch(63% 0.177 149.3)
-
Step 600
600
#008B3C
oklch(55.6% 0.155 149.4)
-
Step 700
700
#007531
oklch(49.1% 0.138 149.3)
-
Step 800
800
#006027
oklch(42.7% 0.12 149.3)
-
Step 900
900
#00501F
oklch(37.7% 0.106 149.2)
-
Step 950
950
#003010
oklch(27% 0.075 149.4)
#18B553 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) | #B6A44A | 0.148 |
| Deuteranopia (no green cones) | #A6995B | 0.147 |
| Tritanopia (no blue cones) | #00B19F | 0.105 |
| Achromatopsia (no color) | #9D9D9D | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18B553
#18B553
oklch(67.7% 0.184 149.3)
- #D367CE
#D367CE
oklch(67.8% 0.184 329.1)
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 #18B553, closest first.
No curated palette has a color within ΔE 0.04 of #18B553.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Shamrock #01B44C ΔE 0.009
- Medium Green #39AD48 ΔE 0.023
- Cool Green #33B864 ΔE 0.024
- Leafy Green #51B73B ΔE 0.033
- Shamrock Green #02C14D ΔE 0.037
- Dark Pastel Green #56AE57 ΔE 0.038
- Jade Green #2BAF6A ΔE 0.038
- Kelly Green #02AB2E ΔE 0.041
Use #18B553 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.