#178A8E
Closest named color: Dark Cyan (#008B8B). oklch(57.7% 0.093 198.6), rgb(23, 138, 142).
Aa
Black text reads best on this color (5.06:1).
About this color
#178A8E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.093 and its hue 199°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.008 away. Black text reads best on it, at 5.06:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.06:1 |
| White text | 4.14:1 |
Values
| HEX | #178A8E |
| RGB | rgb(23, 138, 142) |
| HSL | hsl(182, 72%, 32%) |
| OKLCH | oklch(57.7% 0.093 198.6) |
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 #178A8E | 4.14:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #178A8E | 5.06:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #178A8E text on white | 4.14:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #178A8E text on black | 5.06:1 | AA | Lc -33.6 | 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
#E1ECED
oklch(93.5% 0.012 203.5)
-
Step 200
200
#C8DEDF
oklch(88.5% 0.024 200.1)
-
Step 300
300
#A2C9CB
oklch(80.8% 0.041 200.2)
-
Step 400
400
#6CAEB0
oklch(70.8% 0.067 198.2)
-
Step 500
500
#3D999D
oklch(63% 0.086 199.2)
-
Step 600
600 (this color)
#178A8E
oklch(57.7% 0.093 198.6)
-
Step 700
700
#006F72
oklch(49.2% 0.084 198.1)
-
Step 800
800
#025B5E
oklch(42.8% 0.072 198.7)
-
Step 900
900
#134B4D
oklch(37.9% 0.056 198.5)
-
Step 950
950
#0E2C2D
oklch(27.1% 0.035 198.3)
#178A8E 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) | #7F838E | 0.095 |
| Deuteranopia (no green cones) | #6F778F | 0.090 |
| Tritanopia (no blue cones) | #008F8B | 0.018 |
| Achromatopsia (no color) | #7C7C7C | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178A8E
#178A8E
oklch(57.7% 0.093 198.6)
- #AA6264
#AA6264
oklch(57.8% 0.093 18.6)
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 #178A8E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.008
- Teal Green #0A9396 ΔE 0.026
- Teal Blue #01889F ΔE 0.029
- Teal #008080 ΔE 0.035
- Dusty Teal #4C9085 ΔE 0.043
- Ocean #017B92 ΔE 0.050
- Sea #3C9992 ΔE 0.052
- Blue Green #0F9B8E ΔE 0.052
Use #178A8E 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.