#178B7C
Closest named color: Dark Cyan (#008B8B). oklch(57.4% 0.098 181.3), rgb(23, 139, 124).
Aa
Black text reads best on this color (5.02:1).
About this color
#178B7C is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.098 and its hue 181°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.023 away. Black text reads best on it, at 5.02:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.02:1 |
| White text | 4.18:1 |
Values
| HEX | #178B7C |
| RGB | rgb(23, 139, 124) |
| HSL | hsl(172, 72%, 32%) |
| OKLCH | oklch(57.4% 0.098 181.3) |
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 #178B7C | 4.18:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #178B7C | 5.02:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #178B7C text on white | 4.18:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #178B7C text on black | 5.02:1 | AA | Lc -33.3 | 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
#F1F7F6
oklch(97.1% 0.006 185.3)
-
Step 100
100
#E1EDEA
oklch(93.6% 0.013 179.5)
-
Step 200
200
#C9DFDA
oklch(88.6% 0.024 180.6)
-
Step 300
300
#A2CAC2
oklch(80.8% 0.044 181.6)
-
Step 400
400
#6DAFA3
oklch(70.6% 0.07 181.4)
-
Step 500
500
#3E9B8D
oklch(63% 0.09 181.8)
-
Step 600
600 (this color)
#178B7C
oklch(57.4% 0.098 181.3)
-
Step 700
700
#007164
oklch(49.2% 0.089 181.2)
-
Step 800
800
#045C52
oklch(42.7% 0.075 182.1)
-
Step 900
900
#134C43
oklch(37.8% 0.06 180.2)
-
Step 950
950
#0E2C28
oklch(26.9% 0.036 183.6)
#178B7C 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) | #84827B | 0.104 |
| Deuteranopia (no green cones) | #75777D | 0.099 |
| Tritanopia (no blue cones) | #008E86 | 0.015 |
| Achromatopsia (no color) | #7C7C7C | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178B7C
#178B7C
oklch(57.4% 0.098 181.3)
- #A85E74
#A85E74
oklch(57.3% 0.099 1.6)
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 #178B7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.023
- Teal #008080 ΔE 0.038
- Teal Green #0A9396 ΔE 0.040
- Viridian #1E9167 ΔE 0.041
- Dusty Teal #4C9085 ΔE 0.041
- Blue Green #0F9B8E ΔE 0.048
- Sea Green #2E8B57 ΔE 0.054
- Bluegreen #017A79 ΔE 0.054
Use #178B7C 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.