#178E9B
Closest named color: Teal Green (#0A9396). oklch(59.3% 0.097 206.7), rgb(23, 142, 155).
Aa
Black text reads best on this color (5.37:1).
About this color
#178E9B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.097 and its hue 207°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Green (#0A9396), ΔE 0.019 away. Black text reads best on it, at 5.37:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Teal Green (#0A9396) |
| Black text | 5.37:1 |
| White text | 3.90:1 |
Values
| HEX | #178E9B |
| RGB | rgb(23, 142, 155) |
| HSL | hsl(186, 74%, 35%) |
| OKLCH | oklch(59.3% 0.097 206.7) |
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 #178E9B | 3.90:1 | AA large text | Lc -71.5 | Content text, not long reading |
| Black text on #178E9B | 5.37:1 | AA | Lc 38.1 | Non-text elements, placeholder text |
| #178E9B text on white | 3.90:1 | AA large text | Lc 66.0 | Content text, not long reading |
| #178E9B text on black | 5.37:1 | AA | Lc -35.6 | 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
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C8DEE1
oklch(88.5% 0.024 206.6)
-
Step 300
300
#A1C9CF
oklch(80.9% 0.043 207.6)
-
Step 400
400
#6AADB6
oklch(70.6% 0.069 206.6)
-
Step 500
500
#3999A5
oklch(63.2% 0.09 206.8)
-
Step 600
600 (this color)
#178E9B
oklch(59.3% 0.097 206.7)
-
Step 700
700
#006E79
oklch(49.2% 0.084 206.9)
-
Step 800
800
#005A63
oklch(42.7% 0.073 206.6)
-
Step 900
900
#0F4A51
oklch(37.6% 0.058 206.9)
-
Step 950
950
#0C2B2F
oklch(26.8% 0.037 206.9)
#178E9B 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) | #81889C | 0.094 |
| Deuteranopia (no green cones) | #707C9B | 0.086 |
| Tritanopia (no blue cones) | #009592 | 0.029 |
| Achromatopsia (no color) | #818181 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178E9B
#178E9B
oklch(59.3% 0.097 206.7)
- #B1665F
#B1665F
oklch(59.3% 0.098 26.1)
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 #178E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Green #0A9396 ΔE 0.019
- Teal Blue #01889F ΔE 0.022
- Dark Cyan #008B8B ΔE 0.026
- Blue NCS #118AB2 ΔE 0.041
- Dusty Teal #4C9085 ΔE 0.045
- Sea #3C9992 ΔE 0.045
- Blue Green #0F9B8E ΔE 0.050
- Teal #008080 ΔE 0.054
Use #178E9B 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.