#178D8B
Closest named color: Dark Cyan (#008B8B). oklch(58.4% 0.095 193), rgb(23, 141, 139).
Aa
Black text reads best on this color (5.21:1).
About this color
#178D8B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.095 and its hue 193°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.009 away. Black text reads best on it, at 5.21:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.21:1 |
| White text | 4.02:1 |
Values
| HEX | #178D8B |
| RGB | rgb(23, 141, 139) |
| HSL | hsl(179, 72%, 32%) |
| OKLCH | oklch(58.4% 0.095 193) |
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 #178D8B | 4.02:1 | AA large text | Lc -72.6 | Content text, not long reading |
| Black text on #178D8B | 5.21:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #178D8B text on white | 4.02:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #178D8B 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
#F1F7F6
oklch(97.1% 0.006 185.3)
-
Step 100
100
#E1EDEC
oklch(93.7% 0.013 190.9)
-
Step 200
200
#C8DEDD
oklch(88.4% 0.023 193.4)
-
Step 300
300
#A1CAC8
oklch(80.9% 0.043 192.6)
-
Step 400
400
#6BAEAC
oklch(70.6% 0.068 193.3)
-
Step 500
500
#3C9A98
oklch(63.1% 0.087 193.2)
-
Step 600
600 (this color)
#178D8B
oklch(58.4% 0.095 193)
-
Step 700
700
#006F6E
oklch(49% 0.084 193.7)
-
Step 800
800
#005B5A
oklch(42.6% 0.073 193.5)
-
Step 900
900
#114B4A
oklch(37.7% 0.057 193.3)
-
Step 950
950
#0D2C2B
oklch(27% 0.036 192.3)
#178D8B 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) | #83858B | 0.100 |
| Deuteranopia (no green cones) | #747A8C | 0.094 |
| Tritanopia (no blue cones) | #00928C | 0.015 |
| Achromatopsia (no color) | #7F7F7F | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178D8B
#178D8B
oklch(58.4% 0.095 193)
- #AC636B
#AC636B
oklch(58.4% 0.095 13.4)
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 #178D8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.009
- Teal Green #0A9396 ΔE 0.021
- Dusty Teal #4C9085 ΔE 0.036
- Teal Blue #01889F ΔE 0.039
- Teal #008080 ΔE 0.041
- Blue Green #0F9B8E ΔE 0.042
- Sea #3C9992 ΔE 0.043
- Persian Green #2A9D8F ΔE 0.050
Use #178D8B 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.