#175A9F
Closest named color: Dusk Blue (#26538D). oklch(46.5% 0.129 253.3), rgb(23, 90, 159).
Aa
White text reads best on this color (7.00:1).
About this color
#175A9F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.129 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.032 away. White text reads best on it, at 7.00:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.99:1 |
| White text | 7.00:1 |
Values
| HEX | #175A9F |
| RGB | rgb(23, 90, 159) |
| HSL | hsl(210, 75%, 36%) |
| OKLCH | oklch(46.5% 0.129 253.3) |
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 #175A9F | 7.00:1 | AAA | Lc -88.8 | Fine for body text |
| Black text on #175A9F | 2.99:1 | Fails | Lc 20.3 | Dividers and decoration only |
| #175A9F text on white | 7.00:1 | AAA | Lc 83.8 | Fine for body text |
| #175A9F text on black | 2.99:1 | Fails | Lc -18.2 | 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 700.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CADBF0
oklch(88.5% 0.034 253.7)
-
Step 300
300
#A5C4E9
oklch(81% 0.062 253.1)
-
Step 400
400
#73A4DE
oklch(70.7% 0.1 253.3)
-
Step 500
500
#4D8CD4
oklch(63.1% 0.127 253.2)
-
Step 600
600
#2E75C2
oklch(55.7% 0.139 253.2)
-
Step 700
700 (this color)
#175A9F
oklch(46.5% 0.129 253.3)
-
Step 800
800
#1D5087
oklch(42.7% 0.106 253)
-
Step 900
900
#1E436C
oklch(37.7% 0.082 252.9)
-
Step 950
950
#12273F
oklch(26.9% 0.053 253.1)
#175A9F 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) | #3760A2 | 0.033 |
| Deuteranopia (no green cones) | #1D549E | 0.016 |
| Tritanopia (no blue cones) | #006B74 | 0.098 |
| Achromatopsia (no color) | #595959 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175A9F
#175A9F
oklch(46.5% 0.129 253.3)
- #7A4F00
#7A4F00
oklch(46.4% 0.099 73.2)
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 #175A9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.032
- Denim Blue #3B5B92 ΔE 0.036
- Light Navy Blue #2E5A88 ΔE 0.040
- Peacock Blue #016795 ΔE 0.044
- Light Navy #155084 ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.051
- Dusky Blue #475F94 ΔE 0.051
- Cobalt #1E488F ΔE 0.054
Use #175A9F 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.