#175A7A
Closest named color: Deep Sea Blue (#015482). oklch(44.3% 0.083 234.4), rgb(23, 90, 122).
Aa
White text reads best on this color (7.55:1).
About this color
#175A7A is a dark, moderately saturated blue. In OKLCH its lightness is 44%, 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 0.028 away. White text reads best on it, at 7.55:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.77:1 |
| White text | 7.55:1 |
Values
| HEX | #175A7A |
| RGB | rgb(23, 90, 122) |
| HSL | hsl(199, 68%, 28%) |
| OKLCH | oklch(44.3% 0.083 234.4) |
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 #175A7A | 7.55:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #175A7A | 2.77:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #175A7A text on white | 7.55:1 | AAA | Lc 85.9 | Fine for body text |
| #175A7A text on black | 2.77:1 | Fails | Lc -16.1 | 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
#6FA9CA
oklch(70.7% 0.077 234.4)
-
Step 500
500
#4493BC
oklch(63.1% 0.099 234)
-
Step 600
600
#1D7DA9
oklch(55.7% 0.108 234.3)
-
Step 700
700
#0B6991
oklch(49.2% 0.1 234.5)
-
Step 800
800 (this color)
#175A7A
oklch(44.3% 0.083 234.4)
-
Step 900
900
#18475F
oklch(37.8% 0.065 234.6)
-
Step 950
950
#102A37
oklch(27.1% 0.04 232.6)
#175A7A 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) | #4A597B | 0.050 |
| Deuteranopia (no green cones) | #3D5079 | 0.042 |
| Tritanopia (no blue cones) | #006265 | 0.050 |
| Achromatopsia (no color) | #545454 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175A7A
#175A7A
oklch(44.3% 0.083 234.4)
- #764522
#764522
oklch(44.1% 0.083 54.1)
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 #175A7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.028
- Light Navy Blue #2E5A88 ΔE 0.031
- Petrol #005F6A ΔE 0.036
- YInMn Blue #415A77 ΔE 0.038
- Light Navy #155084 ΔE 0.039
- Dusk Blue #26538D ΔE 0.043
- Denim #3B638C ΔE 0.051
- Peacock Blue #016795 ΔE 0.052
Use #175A7A 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.