#178D19
Closest named color: Emerald Green (#028F1E). oklch(56.1% 0.179 142.9), rgb(23, 141, 25).
Aa
Black text reads best on this color (4.86:1).
About this color
#178D19 is a medium-dark, vivid green. In OKLCH its lightness is 56%, its chroma 0.179 and its hue 143°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald Green (#028F1E), ΔE 0.006 away. Black text reads best on it, at 4.86:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.179) |
| Temperature | in between |
| Nearest name | Emerald Green (#028F1E) |
| Black text | 4.86:1 |
| White text | 4.32:1 |
Values
| HEX | #178D19 |
| RGB | rgb(23, 141, 25) |
| HSL | hsl(121, 72%, 32%) |
| OKLCH | oklch(56.1% 0.179 142.9) |
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 #178D19 | 4.32:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #178D19 | 4.86:1 | AA | Lc 34.8 | Non-text elements, placeholder text |
| #178D19 text on white | 4.32:1 | AA large text | Lc 69.3 | Content text, not long reading |
| #178D19 text on black | 4.86:1 | AA | Lc -32.4 | 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 600.
-
Step 50
50
#F1F7F1
oklch(97% 0.01 145.5)
-
Step 100
100
#E1EEE0
oklch(93.6% 0.023 143.4)
-
Step 200
200
#C9E1C6
oklch(88.5% 0.045 142.1)
-
Step 300
300
#A3CE9F
oklch(80.8% 0.079 142.6)
-
Step 400
400
#6EB56A
oklch(70.8% 0.128 142.9)
-
Step 500
500
#41A13E
oklch(63% 0.164 142.8)
-
Step 600
600 (this color)
#178D19
oklch(56.1% 0.179 142.9)
-
Step 700
700
#007606
oklch(49% 0.165 142.9)
-
Step 800
800
#0A600C
oklch(42.6% 0.137 142.9)
-
Step 900
900
#154F15
oklch(37.7% 0.107 143.1)
-
Step 950
950
#0F2E0E
oklch(26.9% 0.067 142.9)
#178D19 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) | #907F00 | 0.126 |
| Deuteranopia (no green cones) | #847628 | 0.128 |
| Tritanopia (no blue cones) | #008978 | 0.115 |
| Achromatopsia (no color) | #7A7A7A | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178D19
#178D19
oklch(56.1% 0.179 142.9)
- #A447B0
#A447B0
oklch(56% 0.179 323)
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 #178D19, closest first.
No curated palette has a color within ΔE 0.04 of #178D19.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald Green #028F1E ΔE 0.006
- Forest Green #228B22 ΔE 0.010
- Irish Green #019529 ΔE 0.023
- True Green #089404 ΔE 0.024
- Kelley Green #009337 ΔE 0.024
- Dark Grass Green #388004 ΔE 0.038
- Green #008000 ΔE 0.041
- Tree Green #2A7E19 ΔE 0.045
Use #178D19 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.