#178F9D
Closest named color: Teal Green (#0A9396). oklch(59.6% 0.098 207.5), rgb(23, 143, 157).
Aa
Black text reads best on this color (5.45:1).
About this color
#178F9D is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 60%, its chroma 0.098 and its hue 208°. 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 5.45:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Teal Green (#0A9396) |
| Black text | 5.45:1 |
| White text | 3.85:1 |
Values
| HEX | #178F9D |
| RGB | rgb(23, 143, 157) |
| HSL | hsl(186, 74%, 35%) |
| OKLCH | oklch(59.6% 0.098 207.5) |
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 #178F9D | 3.85:1 | AA large text | Lc -71.0 | Content text, not long reading |
| Black text on #178F9D | 5.45:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #178F9D text on white | 3.85:1 | AA large text | Lc 65.5 | Content text, not long reading |
| #178F9D text on black | 5.45:1 | AA | Lc -36.1 | 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 500.
-
Step 50
50
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E0EDEF
oklch(93.7% 0.014 207.9)
-
Step 200
200
#C6DEE2
oklch(88.4% 0.026 208.7)
-
Step 300
300
#9DCAD1
oklch(80.9% 0.048 208)
-
Step 400
400
#63AEB9
oklch(70.6% 0.076 207.7)
-
Step 500
500 (this color)
#178F9D
oklch(59.6% 0.098 207.5)
-
Step 600
600
#008290
oklch(55.5% 0.095 208)
-
Step 700
700
#006E79
oklch(49.2% 0.084 206.9)
-
Step 800
800
#005A64
oklch(42.8% 0.073 207.9)
-
Step 900
900
#024B53
oklch(37.8% 0.064 207.2)
-
Step 950
950
#082C31
oklch(27.1% 0.04 208.4)
#178F9D 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) | #81899E | 0.094 |
| Deuteranopia (no green cones) | #707C9D | 0.087 |
| Tritanopia (no blue cones) | #009693 | 0.030 |
| Achromatopsia (no color) | #828282 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178F9D
#178F9D
oklch(59.6% 0.098 207.5)
- #B2675E
#B2675E
oklch(59.6% 0.098 27.6)
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 #178F9D, 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 0.024
- Dark Cyan #008B8B ΔE 0.029
- Blue NCS #118AB2 ΔE 0.040
- Sea #3C9992 ΔE 0.044
- Dusty Teal #4C9085 ΔE 0.046
- Blue Green #0F9B8E ΔE 0.049
- Persian Green #2A9D8F ΔE 0.054
Use #178F9D 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.