#17558F
Closest named color: Dusk Blue (#26538D). oklch(44.3% 0.113 251.1), rgb(23, 85, 143).
Aa
White text reads best on this color (7.68:1).
About this color
#17558F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.113 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.011 away. White text reads best on it, at 7.68:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.73:1 |
| White text | 7.68:1 |
Values
| HEX | #17558F |
| RGB | rgb(23, 85, 143) |
| HSL | hsl(209, 72%, 33%) |
| OKLCH | oklch(44.3% 0.113 251.1) |
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 #17558F | 7.68:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #17558F | 2.73:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #17558F text on white | 7.68:1 | AAA | Lc 86.3 | Fine for body text |
| #17558F 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF1
oklch(88.4% 0.037 252.1)
-
Step 300
300
#A1C4EB
oklch(80.8% 0.067 251.4)
-
Step 400
400
#6DA5E1
oklch(70.7% 0.106 251.1)
-
Step 500
500
#438DD8
oklch(63.1% 0.135 251.1)
-
Step 600
600
#1E75C5
oklch(55.5% 0.147 251.2)
-
Step 700
700
#0D62AB
oklch(49.1% 0.138 251.3)
-
Step 800
800 (this color)
#17558F
oklch(44.3% 0.113 251.1)
-
Step 900
900
#17436E
oklch(37.6% 0.088 251)
-
Step 950
950
#0F2841
oklch(27.1% 0.056 250.6)
#17558F 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) | #395991 | 0.034 |
| Deuteranopia (no green cones) | #254E8E | 0.021 |
| Tritanopia (no blue cones) | #00636B | 0.083 |
| Achromatopsia (no color) | #535353 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17558F
#17558F
oklch(44.3% 0.113 251.1)
- #744900
#744900
oklch(44.4% 0.096 71.2)
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 #17558F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.011
- Light Navy #155084 ΔE 0.022
- Deep Sea Blue #015482 ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.028
- Cobalt #1E488F ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.039
- Peacock Blue #016795 ΔE 0.052
- Denim #3B638C ΔE 0.057
Use #17558F 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.