#178F2A
Closest named color: Emerald Green (#028F1E). oklch(56.8% 0.171 144.7), rgb(23, 143, 42).
Aa
Black text reads best on this color (4.99:1).
About this color
#178F2A is a medium-dark, vivid green. In OKLCH its lightness is 57%, its chroma 0.171 and its hue 145°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald Green (#028F1E), ΔE 0.011 away. Black text reads best on it, at 4.99:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.171) |
| Temperature | in between |
| Nearest name | Emerald Green (#028F1E) |
| Black text | 4.99:1 |
| White text | 4.20:1 |
Values
| HEX | #178F2A |
| RGB | rgb(23, 143, 42) |
| HSL | hsl(130, 72%, 33%) |
| OKLCH | oklch(56.8% 0.171 144.7) |
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 #178F2A | 4.20:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #178F2A | 4.99:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #178F2A text on white | 4.20:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #178F2A text on black | 4.99:1 | AA | Lc -33.3 | 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
#E1EEE1
oklch(93.6% 0.022 145.4)
-
Step 200
200
#C9E1C8
oklch(88.5% 0.042 144.1)
-
Step 300
300
#A2CEA2
oklch(80.8% 0.077 144.8)
-
Step 400
400
#6DB56F
oklch(70.8% 0.124 144.7)
-
Step 500
500
#40A147
oklch(63.1% 0.157 144.7)
-
Step 600
600 (this color)
#178F2A
oklch(56.8% 0.171 144.7)
-
Step 700
700
#00761B
oklch(49.2% 0.156 144.8)
-
Step 800
800
#076017
oklch(42.6% 0.131 144.7)
-
Step 900
900
#144F1A
oklch(37.7% 0.103 144.7)
-
Step 950
950
#0E2E10
oklch(26.9% 0.065 144.6)
#178F2A 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) | #92811B | 0.127 |
| Deuteranopia (no green cones) | #857834 | 0.127 |
| Tritanopia (no blue cones) | #008B7B | 0.107 |
| Achromatopsia (no color) | #7C7C7C | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178F2A
#178F2A
oklch(56.8% 0.171 144.7)
- #A64CAD
#A64CAD
oklch(56.8% 0.17 324.7)
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 #178F2A, closest first.
No curated palette has a color within ΔE 0.04 of #178F2A.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald Green #028F1E ΔE 0.011
- Forest Green #228B22 ΔE 0.012
- Kelley Green #009337 ΔE 0.014
- Irish Green #019529 ΔE 0.018
- True Green #089404 ΔE 0.027
- Dark Grass Green #388004 ΔE 0.043
- Sap Green #5C8B15 ΔE 0.048
- Grass Green #3F9B0B ΔE 0.049
Use #178F2A 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.