#178F6D
Closest named color: Viridian (#1E9167). oklch(58% 0.112 167.7), rgb(23, 143, 109).
Aa
Black text reads best on this color (5.18:1).
About this color
#178F6D is a medium-dark, moderately saturated green. In OKLCH its lightness is 58%, its chroma 0.112 and its hue 168°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.012 away. Black text reads best on it, at 5.18:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.112) |
| Temperature | in between |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.18:1 |
| White text | 4.04:1 |
Values
| HEX | #178F6D |
| RGB | rgb(23, 143, 109) |
| HSL | hsl(163, 72%, 33%) |
| OKLCH | oklch(58% 0.112 167.7) |
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 #178F6D | 4.04:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #178F6D | 5.18:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #178F6D text on white | 4.04:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #178F6D text on black | 5.18:1 | AA | Lc -34.4 | 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
#F1F7F4
oklch(97.1% 0.007 164.9)
-
Step 100
100
#E1EDE8
oklch(93.6% 0.014 169.2)
-
Step 200
200
#C8DFD5
oklch(88.4% 0.028 167.7)
-
Step 300
300
#A2CCBA
oklch(81% 0.051 167.1)
-
Step 400
400
#6CB197
oklch(70.7% 0.08 168)
-
Step 500
500
#3D9D7D
oklch(63% 0.103 167.8)
-
Step 600
600 (this color)
#178F6D
oklch(58% 0.112 167.7)
-
Step 700
700
#007255
oklch(49% 0.1 167.6)
-
Step 800
800
#015E45
oklch(42.8% 0.087 167.1)
-
Step 900
900
#124D3A
oklch(37.7% 0.068 167.1)
-
Step 950
950
#0D2D22
oklch(27% 0.043 167.5)
#178F6D 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) | #8B846B | 0.113 |
| Deuteranopia (no green cones) | #7D7A6F | 0.109 |
| Tritanopia (no blue cones) | #009085 | 0.035 |
| Achromatopsia (no color) | #7E7E7E | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178F6D
#178F6D
oklch(58% 0.112 167.7)
- #AA5D86
#AA5D86
oklch(58% 0.112 348)
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 #178F6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.012
- Sea Green #2E8B57 ΔE 0.029
- Ocean Green #3D9973 ΔE 0.039
- Light Forest Green #4F9153 ΔE 0.047
- Dark Sage #598556 ΔE 0.051
- Dark Cyan #008B8B ΔE 0.051
- Blue Green #0F9B8E ΔE 0.052
- Dusty Teal #4C9085 ΔE 0.053
Use #178F6D 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.