#178B2B
Closest named color: Forest Green (#228B22). oklch(55.7% 0.166 145), rgb(23, 139, 43).
Aa
Black text reads best on this color (4.76:1).
About this color
#178B2B is a medium-dark, vivid green. In OKLCH its lightness is 56%, its chroma 0.166 and its hue 145°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Forest Green (#228B22), ΔE 0.007 away. Black text reads best on it, at 4.76:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.166) |
| Temperature | in between |
| Nearest name | Forest Green (#228B22) |
| Black text | 4.76:1 |
| White text | 4.40:1 |
Values
| HEX | #178B2B |
| RGB | rgb(23, 139, 43) |
| HSL | hsl(130, 72%, 32%) |
| OKLCH | oklch(55.7% 0.166 145) |
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 #178B2B | 4.40:1 | AA large text | Lc -75.5 | Fine for body text |
| Black text on #178B2B | 4.76:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #178B2B text on white | 4.40:1 | AA large text | Lc 70.0 | Content text, not long reading |
| #178B2B text on black | 4.76:1 | AA | Lc -31.7 | 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
#C9E1C9
oklch(88.5% 0.041 145.2)
-
Step 300
300
#A3CEA3
oklch(80.9% 0.075 144.8)
-
Step 400
400
#6FB471
oklch(70.7% 0.119 144.8)
-
Step 500
500
#42A14A
oklch(63.2% 0.153 145)
-
Step 600
600 (this color)
#178B2B
oklch(55.7% 0.166 145)
-
Step 700
700
#01761D
oklch(49.2% 0.154 145)
-
Step 800
800
#0C601B
oklch(42.7% 0.127 145.1)
-
Step 900
900
#164F1C
oklch(37.8% 0.1 144.9)
-
Step 950
950
#0F2E12
oklch(26.9% 0.062 145.4)
#178B2B 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) | #8D7D1E | 0.123 |
| Deuteranopia (no green cones) | #817534 | 0.123 |
| Tritanopia (no blue cones) | #008777 | 0.102 |
| Achromatopsia (no color) | #787878 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178B2B
#178B2B
oklch(55.7% 0.166 145)
- #A24AA8
#A24AA8
oklch(55.7% 0.166 325)
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 #178B2B, closest first.
No curated palette has a color within ΔE 0.04 of #178B2B.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Forest Green #228B22 ΔE 0.007
- Emerald Green #028F1E ΔE 0.018
- Kelley Green #009337 ΔE 0.023
- Irish Green #019529 ΔE 0.030
- Dark Grass Green #388004 ΔE 0.034
- True Green #089404 ΔE 0.037
- Tree Green #2A7E19 ΔE 0.037
- Green #008000 ΔE 0.039
Use #178B2B 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.