#175B7B
Closest named color: Deep Sea Blue (#015482). oklch(44.6% 0.083 234.1), rgb(23, 91, 123).
Aa
White text reads best on this color (7.44:1).
About this color
#175B7B is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.083 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.029 away. White text reads best on it, at 7.44:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.81:1 |
| White text | 7.44:1 |
Values
| HEX | #175B7B |
| RGB | rgb(23, 91, 123) |
| HSL | hsl(199, 68%, 29%) |
| OKLCH | oklch(44.6% 0.083 234.1) |
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 #175B7B | 7.44:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #175B7B | 2.81:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #175B7B text on white | 7.44:1 | AAA | Lc 85.6 | Fine for body text |
| #175B7B text on black | 2.81:1 | Fails | Lc -16.5 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C9DDE9
oklch(88.6% 0.027 234)
-
Step 300
300
#A3C6DC
oklch(80.8% 0.049 235.8)
-
Step 400
400
#6EA9CA
oklch(70.7% 0.078 233.9)
-
Step 500
500
#4393BC
oklch(63.1% 0.099 233.8)
-
Step 600
600
#1B7DA9
oklch(55.7% 0.108 234)
-
Step 700
700
#086991
oklch(49.1% 0.101 234.2)
-
Step 800
800 (this color)
#175B7B
oklch(44.6% 0.083 234.1)
-
Step 900
900
#17475F
oklch(37.7% 0.065 234.2)
-
Step 950
950
#0F2A37
oklch(27.1% 0.041 231.9)
#175B7B 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) | #4B5A7C | 0.051 |
| Deuteranopia (no green cones) | #3E517A | 0.043 |
| Tritanopia (no blue cones) | #006366 | 0.050 |
| Achromatopsia (no color) | #555555 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175B7B
#175B7B
oklch(44.6% 0.083 234.1)
- #774623
#774623
oklch(44.5% 0.083 54.2)
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 #175B7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.029
- Light Navy Blue #2E5A88 ΔE 0.030
- Petrol #005F6A ΔE 0.036
- YInMn Blue #415A77 ΔE 0.038
- Light Navy #155084 ΔE 0.040
- Dusk Blue #26538D ΔE 0.044
- Peacock Blue #016795 ΔE 0.049
- Denim #3B638C ΔE 0.049
Use #175B7B 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.