#17538B
Closest named color: Dusk Blue (#26538D). oklch(43.5% 0.11 250.9), rgb(23, 83, 139).
Aa
White text reads best on this color (7.93:1).
About this color
#17538B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.110 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.012 away. White text reads best on it, at 7.93:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.64:1 |
| White text | 7.93:1 |
Values
| HEX | #17538B |
| RGB | rgb(23, 83, 139) |
| HSL | hsl(209, 72%, 32%) |
| OKLCH | oklch(43.5% 0.11 250.9) |
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 #17538B | 7.93:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #17538B | 2.64:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #17538B text on white | 7.93:1 | AAA | Lc 87.1 | Fine for body text |
| #17538B text on black | 2.64:1 | Fails | Lc -15.0 | Not readable |
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
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DBF1
oklch(88.4% 0.037 252.1)
-
Step 300
300
#A2C4E9
oklch(80.8% 0.064 250.8)
-
Step 400
400
#6FA5DF
oklch(70.8% 0.103 251.1)
-
Step 500
500
#458DD6
oklch(63.1% 0.132 251)
-
Step 600
600
#2276C3
oklch(55.7% 0.142 250.8)
-
Step 700
700
#1363A9
oklch(49.3% 0.133 250.8)
-
Step 800
800 (this color)
#17538B
oklch(43.5% 0.11 250.9)
-
Step 900
900
#19436D
oklch(37.6% 0.086 251.2)
-
Step 950
950
#102840
oklch(27.1% 0.054 250.5)
#17538B 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) | #38578D | 0.033 |
| Deuteranopia (no green cones) | #254C8A | 0.021 |
| Tritanopia (no blue cones) | #006068 | 0.080 |
| Achromatopsia (no color) | #515151 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17538B
#17538B
oklch(43.5% 0.11 250.9)
- #714700
#714700
oklch(43.6% 0.094 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 #17538B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.012
- Light Navy #155084 ΔE 0.014
- Deep Sea Blue #015482 ΔE 0.019
- Light Navy Blue #2E5A88 ΔE 0.031
- Cobalt #1E488F ΔE 0.033
- Denim Blue #3B5B92 ΔE 0.044
- Twilight Blue #0A437A ΔE 0.054
- Peacock Blue #016795 ΔE 0.058
Use #17538B 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.