#178F74
Closest named color: Viridian (#1E9167). oklch(58.2% 0.107 172.4), rgb(23, 143, 116).
Aa
Black text reads best on this color (5.21:1).
About this color
#178F74 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.107 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.022 away. Black text reads best on it, at 5.21:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.21:1 |
| White text | 4.02:1 |
Values
| HEX | #178F74 |
| RGB | rgb(23, 143, 116) |
| HSL | hsl(167, 72%, 33%) |
| OKLCH | oklch(58.2% 0.107 172.4) |
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 #178F74 | 4.02:1 | AA large text | Lc -72.6 | Content text, not long reading |
| Black text on #178F74 | 5.21:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #178F74 text on white | 4.02:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #178F74 text on black | 5.21:1 | AA | Lc -34.6 | 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
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E1EDE9
oklch(93.6% 0.014 174.2)
-
Step 200
200
#C8DFD7
oklch(88.4% 0.027 172.8)
-
Step 300
300
#A2CBBD
oklch(80.9% 0.048 172.2)
-
Step 400
400
#6CB19B
oklch(70.8% 0.078 171.7)
-
Step 500
500
#3C9D83
oklch(63.2% 0.099 172.3)
-
Step 600
600 (this color)
#178F74
oklch(58.2% 0.107 172.4)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#124C3E
oklch(37.6% 0.063 173.1)
-
Step 950
950
#0D2D24
oklch(27% 0.041 171.7)
#178F74 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) | #8A8573 | 0.110 |
| Deuteranopia (no green cones) | #7B7A76 | 0.106 |
| Tritanopia (no blue cones) | #009087 | 0.028 |
| Achromatopsia (no color) | #7F7F7F | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178F74
#178F74
oklch(58.2% 0.107 172.4)
- #AB5F81
#AB5F81
oklch(58.3% 0.107 352.7)
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 #178F74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.022
- Sea Green #2E8B57 ΔE 0.039
- Ocean Green #3D9973 ΔE 0.039
- Dark Cyan #008B8B ΔE 0.041
- Blue Green #0F9B8E ΔE 0.045
- Dusty Teal #4C9085 ΔE 0.045
- Teal Green #0A9396 ΔE 0.050
- Persian Green #2A9D8F ΔE 0.053
Use #178F74 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.