#175B77
Closest named color: Petrol (#005F6A). oklch(44.4% 0.079 230.5), rgb(23, 91, 119).
Aa
White text reads best on this color (7.50:1).
About this color
#175B77 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.079 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.030 away. White text reads best on it, at 7.50:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.79:1 |
| White text | 7.50:1 |
Values
| HEX | #175B77 |
| RGB | rgb(23, 91, 119) |
| HSL | hsl(197, 68%, 28%) |
| OKLCH | oklch(44.4% 0.079 230.5) |
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 #175B77 | 7.50:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #175B77 | 2.79:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #175B77 text on white | 7.50:1 | AAA | Lc 85.7 | Fine for body text |
| #175B77 text on black | 2.79:1 | Fails | Lc -16.3 | 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
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C9DDE7
oklch(88.6% 0.025 229.2)
-
Step 300
300
#A3C7D9
oklch(80.9% 0.046 229.7)
-
Step 400
400
#6FAAC6
oklch(70.8% 0.074 229.5)
-
Step 500
500
#4494B8
oklch(63.2% 0.095 230.3)
-
Step 600
600
#1C7EA4
oklch(55.7% 0.103 230)
-
Step 700
700
#0A6A8D
oklch(49.2% 0.096 230.6)
-
Step 800
800 (this color)
#175B77
oklch(44.4% 0.079 230.5)
-
Step 900
900
#18475C
oklch(37.6% 0.062 231)
-
Step 950
950
#102A36
oklch(27.1% 0.039 230.5)
#175B77 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) | #4D5A78 | 0.054 |
| Deuteranopia (no green cones) | #405177 | 0.046 |
| Tritanopia (no blue cones) | #006364 | 0.047 |
| Achromatopsia (no color) | #555555 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175B77
#175B77
oklch(44.4% 0.079 230.5)
- #764628
#764628
oklch(44.4% 0.079 51.5)
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 #175B77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.030
- Deep Sea Blue #015482 ΔE 0.034
- Light Navy Blue #2E5A88 ΔE 0.036
- YInMn Blue #415A77 ΔE 0.038
- Light Navy #155084 ΔE 0.045
- Dusk Blue #26538D ΔE 0.050
- Deep Teal #00555A ΔE 0.051
- Denim #3B638C ΔE 0.053
Use #175B77 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.