#175C66
Closest named color: Petrol (#005F6A). oklch(43.8% 0.067 209.2), rgb(23, 92, 102).
Aa
White text reads best on this color (7.61:1).
About this color
#175C66 is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.067 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.011 away. White text reads best on it, at 7.61:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.75:1 |
| White text | 7.61:1 |
Values
| HEX | #175C66 |
| RGB | rgb(23, 92, 102) |
| HSL | hsl(188, 63%, 25%) |
| OKLCH | oklch(43.8% 0.067 209.2) |
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 #175C66 | 7.61:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #175C66 | 2.75:1 | Fails | Lc 17.9 | Dividers and decoration only |
| #175C66 text on white | 7.61:1 | AAA | Lc 86.1 | Fine for body text |
| #175C66 text on black | 2.75:1 | Fails | Lc -15.9 | Dividers and decoration only |
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 800.
-
Step 50
50
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#C9DDE1
oklch(88.4% 0.022 211)
-
Step 300
300
#A4C8CE
oklch(80.9% 0.039 208.8)
-
Step 400
400
#71ACB6
oklch(70.8% 0.063 209.3)
-
Step 500
500
#4697A4
oklch(63.1% 0.081 209.3)
-
Step 600
600
#20818F
oklch(55.6% 0.087 209.4)
-
Step 700
700
#0E6D7A
oklch(49.1% 0.081 209.7)
-
Step 800
800 (this color)
#175C66
oklch(43.8% 0.067 209.2)
-
Step 900
900
#194951
oklch(37.7% 0.053 210.3)
-
Step 950
950
#102B2F
oklch(27% 0.033 208.2)
#175C66 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) | #535867 | 0.064 |
| Deuteranopia (no green cones) | #485066 | 0.059 |
| Tritanopia (no blue cones) | #00615F | 0.024 |
| Achromatopsia (no color) | #545454 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175C66
#175C66
oklch(43.8% 0.067 209.2)
- #73433C
#73433C
oklch(43.8% 0.068 29)
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 #175C66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.011
- Deep Teal #00555A ΔE 0.030
- Dark Green Blue #1F6357 ΔE 0.039
- Dark Aqua #05696B ΔE 0.040
- Dark Slate Gray #2F4F4F ΔE 0.047
- YInMn Blue #415A77 ΔE 0.052
- Dark Blue Green #005249 ΔE 0.055
- Dark Teal #014D4E ΔE 0.059
Use #175C66 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.