#178A3F
Closest named color: Forest Green (#228B22). oklch(55.6% 0.148 149.2), rgb(23, 138, 63).
Aa
Black text reads best on this color (4.74:1).
About this color
#178A3F is a medium-dark, vivid green. In OKLCH its lightness is 56%, its chroma 0.148 and its hue 149°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Forest Green (#228B22), ΔE 0.027 away. Black text reads best on it, at 4.74:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.148) |
| Temperature | in between |
| Nearest name | Forest Green (#228B22) |
| Black text | 4.74:1 |
| White text | 4.42:1 |
Values
| HEX | #178A3F |
| RGB | rgb(23, 138, 63) |
| HSL | hsl(141, 71%, 32%) |
| OKLCH | oklch(55.6% 0.148 149.2) |
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 #178A3F | 4.42:1 | AA large text | Lc -75.7 | Fine for body text |
| Black text on #178A3F | 4.74:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #178A3F text on white | 4.42:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #178A3F text on black | 4.74:1 | AA | Lc -31.5 | 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
#F2F7F2
oklch(97.1% 0.008 145.5)
-
Step 100
100
#E1EEE3
oklch(93.6% 0.02 150.1)
-
Step 200
200
#C9E0CC
oklch(88.4% 0.037 149.1)
-
Step 300
300
#A3CDAA
oklch(80.9% 0.066 149.6)
-
Step 400
400
#6FB37C
oklch(70.7% 0.106 149.2)
-
Step 500
500
#43A05A
oklch(63.2% 0.136 149.1)
-
Step 600
600 (this color)
#178A3F
oklch(55.6% 0.148 149.2)
-
Step 700
700
#017531
oklch(49.1% 0.137 149.3)
-
Step 800
800
#0C5F29
oklch(42.6% 0.114 149.2)
-
Step 900
900
#164E26
oklch(37.7% 0.089 149.4)
-
Step 950
950
#0F2E17
oklch(27.1% 0.056 149.6)
#178A3F 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) | #8B7D38 | 0.120 |
| Deuteranopia (no green cones) | #7F7445 | 0.120 |
| Tritanopia (no blue cones) | #008779 | 0.084 |
| Achromatopsia (no color) | #787878 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178A3F
#178A3F
oklch(55.6% 0.148 149.2)
- #A14F9D
#A14F9D
oklch(55.7% 0.147 329.2)
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 #178A3F, closest first.
No curated palette has a color within ΔE 0.04 of #178A3F.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Forest Green #228B22 ΔE 0.027
- Jungle Green #048243 ΔE 0.028
- Kelley Green #009337 ΔE 0.031
- Sea Green #2E8B57 ΔE 0.034
- Emerald Green #028F1E ΔE 0.037
- Tree Green #2A7E19 ΔE 0.041
- Dark Grass Green #388004 ΔE 0.042
- Irish Green #019529 ΔE 0.044
Use #178A3F 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.