#18A137
Closest named color: Grass Green (#3F9B0B). oklch(61.9% 0.183 145.8), rgb(24, 161, 55).
Aa
Black text reads best on this color (6.19:1).
About this color
#18A137 is a medium-dark, vivid green. In OKLCH its lightness is 62%, its chroma 0.183 and its hue 146°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grass Green (#3F9B0B), ΔE 0.026 away. Black text reads best on it, at 6.19:1.
| Hue family | Greens |
| Lightness | medium-dark (62%) |
| Chroma | vivid (0.183) |
| Temperature | in between |
| Nearest name | Grass Green (#3F9B0B) |
| Black text | 6.19:1 |
| White text | 3.39:1 |
Values
| HEX | #18A137 |
| RGB | rgb(24, 161, 55) |
| HSL | hsl(134, 74%, 36%) |
| OKLCH | oklch(61.9% 0.183 145.8) |
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 #18A137 | 3.39:1 | AA large text | Lc -66.2 | Content text, not long reading |
| Black text on #18A137 | 6.19:1 | AA | Lc 43.3 | Non-text elements, placeholder text |
| #18A137 text on white | 3.39:1 | AA large text | Lc 60.8 | Content text, not long reading |
| #18A137 text on black | 6.19:1 | AA | Lc -40.9 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F1F8F1
oklch(97.2% 0.012 145.5)
-
Step 100
100
#E0EFE0
oklch(93.7% 0.026 145.4)
-
Step 200
200
#C5E2C6
oklch(88.4% 0.049 146.1)
-
Step 300
300
#9CD19E
oklch(81% 0.09 145.6)
-
Step 400
400
#5FB868
oklch(70.8% 0.143 146)
-
Step 500
500 (this color)
#18A137
oklch(61.9% 0.183 145.8)
-
Step 600
600
#008C2A
oklch(55.7% 0.171 145.8)
-
Step 700
700
#007622
oklch(49.2% 0.151 145.8)
-
Step 800
800
#00611A
oklch(42.9% 0.132 145.8)
-
Step 900
900
#005114
oklch(37.8% 0.117 145.7)
-
Step 950
950
#06300D
oklch(27.2% 0.075 145.8)
#18A137 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) | #A3912A | 0.138 |
| Deuteranopia (no green cones) | #958741 | 0.138 |
| Tritanopia (no blue cones) | #009D8B | 0.111 |
| Achromatopsia (no color) | #8B8B8B | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18A137
#18A137
oklch(61.9% 0.183 145.8)
- #BB57C0
#BB57C0
oklch(61.9% 0.182 325.7)
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 #18A137, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grass Green #3F9B0B ΔE 0.026
- Grassy Green #419C03 ΔE 0.027
- Kelly Green #02AB2E ΔE 0.032
- Irish Green #019529 ΔE 0.037
- Medium Green #39AD48 ΔE 0.042
- Mid Green #50A747 ΔE 0.043
- Kelley Green #009337 ΔE 0.044
- True Green #089404 ΔE 0.044
Use #18A137 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.