#178A8B
Closest named color: Dark Cyan (#008B8B). oklch(57.6% 0.094 195.8), rgb(23, 138, 139).
Aa
Black text reads best on this color (5.04:1).
About this color
#178A8B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.094 and its hue 196°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.005 away. Black text reads best on it, at 5.04:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.04:1 |
| White text | 4.16:1 |
Values
| HEX | #178A8B |
| RGB | rgb(23, 138, 139) |
| HSL | hsl(181, 72%, 32%) |
| OKLCH | oklch(57.6% 0.094 195.8) |
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 #178A8B | 4.16:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #178A8B | 5.04:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #178A8B text on white | 4.16:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #178A8B text on black | 5.04:1 | AA | Lc -33.4 | 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
#E1EDEC
oklch(93.7% 0.013 190.9)
-
Step 200
200
#C8DEDE
oklch(88.4% 0.023 196.7)
-
Step 300
300
#A2CAC9
oklch(81% 0.042 194.5)
-
Step 400
400
#6CAEAE
oklch(70.7% 0.067 195.7)
-
Step 500
500
#3E9A9A
oklch(63.2% 0.086 195.2)
-
Step 600
600 (this color)
#178A8B
oklch(57.6% 0.094 195.8)
-
Step 700
700
#006F70
oklch(49.1% 0.084 195.9)
-
Step 800
800
#035B5C
oklch(42.7% 0.072 196.1)
-
Step 900
900
#134B4B
oklch(37.8% 0.056 195)
-
Step 950
950
#0E2C2C
oklch(27.1% 0.035 195.3)
#178A8B 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) | #80838B | 0.097 |
| Deuteranopia (no green cones) | #70778C | 0.091 |
| Tritanopia (no blue cones) | #008F8A | 0.016 |
| Achromatopsia (no color) | #7C7C7C | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178A8B
#178A8B
oklch(57.6% 0.094 195.8)
- #A96166
#A96166
oklch(57.5% 0.094 16)
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 #178A8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.005
- Teal Green #0A9396 ΔE 0.027
- Teal #008080 ΔE 0.033
- Teal Blue #01889F ΔE 0.034
- Dusty Teal #4C9085 ΔE 0.041
- Blue Green #0F9B8E ΔE 0.051
- Sea #3C9992 ΔE 0.052
- Ocean #017B92 ΔE 0.052
Use #178A8B 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.