#178E9D
Closest named color: Teal Blue (#01889F). oklch(59.4% 0.098 208.5), rgb(23, 142, 157).
Aa
Black text reads best on this color (5.39:1).
About this color
#178E9D is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.098 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.021 away. Black text reads best on it, at 5.39:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.39:1 |
| White text | 3.89:1 |
Values
| HEX | #178E9D |
| RGB | rgb(23, 142, 157) |
| HSL | hsl(187, 74%, 35%) |
| OKLCH | oklch(59.4% 0.098 208.5) |
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 #178E9D | 3.89:1 | AA large text | Lc -71.4 | Content text, not long reading |
| Black text on #178E9D | 5.39:1 | AA | Lc 38.2 | Non-text elements, placeholder text |
| #178E9D text on white | 3.89:1 | AA large text | Lc 65.9 | Content text, not long reading |
| #178E9D text on black | 5.39:1 | AA | Lc -35.7 | 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
#63AEBA
oklch(70.7% 0.077 208.8)
-
Step 500
500 (this color)
#178E9D
oklch(59.4% 0.098 208.5)
-
Step 600
600
#008291
oklch(55.5% 0.096 208.9)
-
Step 700
700
#006E7A
oklch(49.2% 0.085 207.9)
-
Step 800
800
#005A64
oklch(42.8% 0.073 207.9)
-
Step 900
900
#034B53
oklch(37.8% 0.064 207.3)
-
Step 950
950
#082C31
oklch(27.1% 0.04 208.4)
#178E9D 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) | #80889E | 0.093 |
| Deuteranopia (no green cones) | #6F7C9D | 0.084 |
| Tritanopia (no blue cones) | #009592 | 0.031 |
| Achromatopsia (no color) | #818181 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178E9D
#178E9D
oklch(59.4% 0.098 208.5)
- #B1675D
#B1675D
oklch(59.4% 0.097 28.5)
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 #178E9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.021
- Teal Green #0A9396 ΔE 0.021
- Dark Cyan #008B8B ΔE 0.029
- Blue NCS #118AB2 ΔE 0.038
- Sea #3C9992 ΔE 0.047
- Dusty Teal #4C9085 ΔE 0.048
- Blue Green #0F9B8E ΔE 0.052
- Teal #008080 ΔE 0.056
Use #178E9D 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.