#17518E
Closest named color: Dusk Blue (#26538D). oklch(43.2% 0.116 253.3), rgb(23, 81, 142).
Aa
White text reads best on this color (8.06:1).
About this color
#17518E is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.116 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.014 away. White text reads best on it, at 8.06:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.60:1 |
| White text | 8.06:1 |
Values
| HEX | #17518E |
| RGB | rgb(23, 81, 142) |
| HSL | hsl(211, 72%, 32%) |
| OKLCH | oklch(43.2% 0.116 253.3) |
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 #17518E | 8.06:1 | AAA | Lc -92.2 | Preferred for body text |
| Black text on #17518E | 2.60:1 | Fails | Lc 16.5 | Dividers and decoration only |
| #17518E text on white | 8.06:1 | AAA | Lc 87.5 | Fine for body text |
| #17518E text on black | 2.60:1 | Fails | Lc -14.6 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
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
#A2C4EC
oklch(80.9% 0.068 252.7)
-
Step 400
400
#6FA4E3
oklch(70.7% 0.109 253.5)
-
Step 500
500
#468CDB
oklch(63.2% 0.139 253.2)
-
Step 600
600
#2374C9
oklch(55.6% 0.152 253.4)
-
Step 700
700
#1561AD
oklch(49.1% 0.14 253.2)
-
Step 800
800 (this color)
#17518E
oklch(43.2% 0.116 253.3)
-
Step 900
900
#194370
oklch(37.8% 0.09 252.7)
-
Step 950
950
#102742
oklch(27% 0.058 253.9)
#17518E 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) | #335690 | 0.030 |
| Deuteranopia (no green cones) | #1D4B8D | 0.017 |
| Tritanopia (no blue cones) | #006068 | 0.088 |
| Achromatopsia (no color) | #505050 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17518E
#17518E
oklch(43.2% 0.116 253.3)
- #6E4700
#6E4700
oklch(43.2% 0.092 73.5)
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 #17518E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.014
- Light Navy #155084 ΔE 0.017
- Deep Sea Blue #015482 ΔE 0.025
- Cobalt #1E488F ΔE 0.026
- Light Navy Blue #2E5A88 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.052
- Twilight #4E518B ΔE 0.060
Use #17518E 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.