#178A74
Closest named color: Viridian (#1E9167). oklch(56.8% 0.101 175.5), rgb(23, 138, 116).
Aa
Black text reads best on this color (4.92:1).
About this color
#178A74 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.101 and its hue 176°. Its hue sits on the cool side of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.034 away. Black text reads best on it, at 4.92:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Viridian (#1E9167) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #178A74 |
| RGB | rgb(23, 138, 116) |
| HSL | hsl(169, 71%, 32%) |
| OKLCH | oklch(56.8% 0.101 175.5) |
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 #178A74 | 4.26:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #178A74 | 4.92:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #178A74 text on white | 4.26:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #178A74 text on black | 4.92:1 | AA | Lc -32.6 | 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
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E1EDE9
oklch(93.6% 0.014 174.2)
-
Step 200
200
#C9DFD8
oklch(88.5% 0.025 174.7)
-
Step 300
300
#A3CBBF
oklch(81% 0.046 174.9)
-
Step 400
400
#6DB09E
oklch(70.7% 0.074 175.1)
-
Step 500
500
#409C87
oklch(63.1% 0.093 175.6)
-
Step 600
600 (this color)
#178A74
oklch(56.8% 0.101 175.5)
-
Step 700
700
#00715E
oklch(49% 0.092 175.6)
-
Step 800
800
#065D4D
oklch(42.8% 0.079 175.3)
-
Step 900
900
#144C40
oklch(37.7% 0.061 175.6)
-
Step 950
950
#0E2D25
oklch(27.1% 0.04 173.6)
#178A74 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) | #858173 | 0.106 |
| Deuteranopia (no green cones) | #767676 | 0.101 |
| Tritanopia (no blue cones) | #008C83 | 0.022 |
| Achromatopsia (no color) | #7A7A7A | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178A74
#178A74
oklch(56.8% 0.101 175.5)
- #A55C79
#A55C79
oklch(56.7% 0.101 355.6)
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 #178A74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.034
- Dark Cyan #008B8B ΔE 0.035
- Teal #008080 ΔE 0.042
- Sea Green #2E8B57 ΔE 0.043
- Dusty Teal #4C9085 ΔE 0.048
- Teal Green #0A9396 ΔE 0.051
- Ocean Green #3D9973 ΔE 0.054
- Bluegreen #017A79 ΔE 0.055
Use #178A74 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.