#175399
Closest named color: Dusk Blue (#26538D). oklch(44.5% 0.129 255.3), rgb(23, 83, 153).
Aa
White text reads best on this color (7.68:1).
About this color
#175399 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.129 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.022 away. White text reads best on it, at 7.68:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.73:1 |
| White text | 7.68:1 |
Values
| HEX | #175399 |
| RGB | rgb(23, 83, 153) |
| HSL | hsl(212, 74%, 35%) |
| OKLCH | oklch(44.5% 0.129 255.3) |
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 #175399 | 7.68:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #175399 | 2.73:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #175399 text on white | 7.68:1 | AAA | Lc 86.2 | Fine for body text |
| #175399 text on black | 2.73:1 | Fails | Lc -15.8 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A0C3F1
oklch(80.8% 0.076 255.4)
-
Step 400
400
#6CA3EB
oklch(70.7% 0.121 255.6)
-
Step 500
500
#418AE4
oklch(63.1% 0.154 255.2)
-
Step 600
600
#1D72D2
oklch(55.6% 0.167 255.2)
-
Step 700
700
#0D5FB6
oklch(49.1% 0.155 255.2)
-
Step 800
800 (this color)
#175399
oklch(44.5% 0.129 255.3)
-
Step 900
900
#174175
oklch(37.6% 0.1 255.6)
-
Step 950
950
#0F2745
oklch(27.1% 0.064 255.3)
#175399 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) | #2E599C | 0.027 |
| Deuteranopia (no green cones) | #0F4E98 | 0.016 |
| Tritanopia (no blue cones) | #00646E | 0.098 |
| Achromatopsia (no color) | #535353 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175399
#175399
oklch(44.5% 0.129 255.3)
- #714B00
#714B00
oklch(44.4% 0.093 75.6)
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 #175399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.022
- Cobalt #1E488F ΔE 0.033
- Light Navy #155084 ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.042
- Denim Blue #3B5B92 ΔE 0.044
- Peacock Blue #016795 ΔE 0.060
- Twilight #4E518B ΔE 0.061
Use #175399 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.