#178B7A
Closest named color: Dark Cyan (#008B8B). oklch(57.3% 0.099 179.7), rgb(23, 139, 122).
Aa
Black text reads best on this color (5.01:1).
About this color
#178B7A is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.099 and its hue 180°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.026 away. Black text reads best on it, at 5.01:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.01:1 |
| White text | 4.19:1 |
Values
| HEX | #178B7A |
| RGB | rgb(23, 139, 122) |
| HSL | hsl(171, 72%, 32%) |
| OKLCH | oklch(57.3% 0.099 179.7) |
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 #178B7A | 4.19:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #178B7A | 5.01:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #178B7A text on white | 4.19:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #178B7A text on black | 5.01:1 | AA | Lc -33.2 | 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
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E1EDEA
oklch(93.6% 0.013 179.5)
-
Step 200
200
#C9DFD9
oklch(88.6% 0.025 177.6)
-
Step 300
300
#A2CBC1
oklch(81% 0.046 178.6)
-
Step 400
400
#6DB0A2
oklch(70.8% 0.072 179.3)
-
Step 500
500
#3F9B8B
oklch(63% 0.091 179.9)
-
Step 600
600 (this color)
#178B7A
oklch(57.3% 0.099 179.7)
-
Step 700
700
#007162
oklch(49.1% 0.09 179.3)
-
Step 800
800
#045C50
oklch(42.6% 0.076 179.7)
-
Step 900
900
#134C42
oklch(37.7% 0.06 178.7)
-
Step 950
950
#0E2C27
oklch(26.9% 0.037 180.8)
#178B7A 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) | #858279 | 0.105 |
| Deuteranopia (no green cones) | #76777B | 0.100 |
| Tritanopia (no blue cones) | #008D86 | 0.017 |
| Achromatopsia (no color) | #7C7C7C | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178B7A
#178B7A
oklch(57.3% 0.099 179.7)
- #A75E76
#A75E76
oklch(57.2% 0.099 359.6)
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 #178B7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.026
- Viridian #1E9167 ΔE 0.039
- Teal #008080 ΔE 0.040
- Dusty Teal #4C9085 ΔE 0.043
- Teal Green #0A9396 ΔE 0.043
- Blue Green #0F9B8E ΔE 0.049
- Sea Green #2E8B57 ΔE 0.051
- Ocean Green #3D9973 ΔE 0.054
Use #178B7A 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.