#175B9E
Closest named color: Dusk Blue (#26538D). oklch(46.7% 0.127 252.4), rgb(23, 91, 158).
Aa
White text reads best on this color (6.93:1).
About this color
#175B9E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.127 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.033 away. White text reads best on it, at 6.93:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 3.02:1 |
| White text | 6.93:1 |
Values
| HEX | #175B9E |
| RGB | rgb(23, 91, 158) |
| HSL | hsl(210, 75%, 35%) |
| OKLCH | oklch(46.7% 0.127 252.4) |
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 #175B9E | 6.93:1 | AA | Lc -88.5 | Fine for body text |
| Black text on #175B9E | 3.02:1 | AA large text | Lc 20.5 | Dividers and decoration only |
| #175B9E text on white | 6.93:1 | AA | Lc 83.5 | Fine for body text |
| #175B9E text on black | 3.02:1 | AA large text | Lc -18.4 | 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
#A5C4E8
oklch(81% 0.061 252.4)
-
Step 400
400
#73A4DC
oklch(70.6% 0.098 252.5)
-
Step 500
500
#4D8DD3
oklch(63.2% 0.125 252.2)
-
Step 600
600
#2E75C0
oklch(55.6% 0.136 252.6)
-
Step 700
700 (this color)
#175B9E
oklch(46.7% 0.127 252.4)
-
Step 800
800
#1D5086
oklch(42.6% 0.105 252.7)
-
Step 900
900
#1E436B
oklch(37.7% 0.081 252.3)
-
Step 950
950
#12273F
oklch(26.9% 0.053 253.1)
#175B9E 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) | #3960A1 | 0.033 |
| Deuteranopia (no green cones) | #21549D | 0.019 |
| Tritanopia (no blue cones) | #006B75 | 0.093 |
| Achromatopsia (no color) | #5A5A5A | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175B9E
#175B9E
oklch(46.7% 0.127 252.4)
- #7C4F00
#7C4F00
oklch(46.7% 0.1 71.9)
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 #175B9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.033
- Denim Blue #3B5B92 ΔE 0.034
- Light Navy Blue #2E5A88 ΔE 0.038
- Peacock Blue #016795 ΔE 0.041
- Dusky Blue #475F94 ΔE 0.049
- Light Navy #155084 ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.050
- Denim #3B638C ΔE 0.051
Use #175B9E 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.