#17538E
Closest named color: Dusk Blue (#26538D). oklch(43.7% 0.114 252), rgb(23, 83, 142).
Aa
White text reads best on this color (7.88:1).
About this color
#17538E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.114 and its hue 252°. 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 7.88:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.66:1 |
| White text | 7.88:1 |
Values
| HEX | #17538E |
| RGB | rgb(23, 83, 142) |
| HSL | hsl(210, 72%, 32%) |
| OKLCH | oklch(43.7% 0.114 252) |
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 #17538E | 7.88:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #17538E | 2.66:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #17538E text on white | 7.88:1 | AAA | Lc 86.9 | Fine for body text |
| #17538E text on black | 2.66:1 | Fails | Lc -15.2 | 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 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
#C8DBF2
oklch(88.4% 0.038 253.2)
-
Step 300
300
#A2C4EB
oklch(80.9% 0.066 252.1)
-
Step 400
400
#6EA5E1
oklch(70.8% 0.106 251.5)
-
Step 500
500
#448CD9
oklch(63% 0.137 252.2)
-
Step 600
600
#2175C6
oklch(55.6% 0.148 251.9)
-
Step 700
700
#1162AB
oklch(49.1% 0.137 251.7)
-
Step 800
800 (this color)
#17538E
oklch(43.7% 0.114 252)
-
Step 900
900
#18436F
oklch(37.7% 0.089 251.8)
-
Step 950
950
#102741
oklch(26.9% 0.057 253.1)
#17538E 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) | #365790 | 0.031 |
| Deuteranopia (no green cones) | #224D8D | 0.017 |
| Tritanopia (no blue cones) | #006169 | 0.085 |
| Achromatopsia (no color) | #515151 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17538E
#17538E
oklch(43.7% 0.114 252)
- #714800
#714800
oklch(43.8% 0.094 72.3)
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 #17538E, 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 0.018
- Deep Sea Blue #015482 ΔE 0.023
- Cobalt #1E488F ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.032
- Denim Blue #3B5B92 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.056
- Peacock Blue #016795 ΔE 0.058
Use #17538E 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.