#178B7E
Closest named color: Dark Cyan (#008B8B). oklch(57.4% 0.097 183.1), rgb(23, 139, 126).
Aa
Black text reads best on this color (5.03:1).
About this color
#178B7E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.097 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.020 away. Black text reads best on it, at 5.03:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.03:1 |
| White text | 4.17:1 |
Values
| HEX | #178B7E |
| RGB | rgb(23, 139, 126) |
| HSL | hsl(173, 72%, 32%) |
| OKLCH | oklch(57.4% 0.097 183.1) |
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 #178B7E | 4.17:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #178B7E | 5.03:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #178B7E text on white | 4.17:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #178B7E text on black | 5.03:1 | 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
#C8DFDA
oklch(88.5% 0.025 181.2)
-
Step 300
300
#A2CAC3
oklch(80.8% 0.044 183.4)
-
Step 400
400
#6DAFA5
oklch(70.7% 0.069 183.7)
-
Step 500
500
#3E9B8F
oklch(63.1% 0.089 183.6)
-
Step 600
600 (this color)
#178B7E
oklch(57.4% 0.097 183.1)
-
Step 700
700
#007065
oklch(49% 0.087 183.1)
-
Step 800
800
#035C53
oklch(42.7% 0.075 183.3)
-
Step 900
900
#134C44
oklch(37.8% 0.059 181.8)
-
Step 950
950
#0E2C28
oklch(26.9% 0.036 183.6)
#178B7E 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) | #84827E | 0.104 |
| Deuteranopia (no green cones) | #75777F | 0.099 |
| Tritanopia (no blue cones) | #008E87 | 0.014 |
| Achromatopsia (no color) | #7C7C7C | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178B7E
#178B7E
oklch(57.4% 0.097 183.1)
- #A85F73
#A85F73
oklch(57.4% 0.097 3)
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 #178B7E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.020
- Teal #008080 ΔE 0.037
- Teal Green #0A9396 ΔE 0.038
- Dusty Teal #4C9085 ΔE 0.040
- Viridian #1E9167 ΔE 0.044
- Blue Green #0F9B8E ΔE 0.048
- Bluegreen #017A79 ΔE 0.053
- Sea #3C9992 ΔE 0.053
Use #178B7E 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.