#17499E
Closest named color: Cobalt (#1E488F). oklch(42.6% 0.148 260.5), rgb(23, 73, 158).
Aa
White text reads best on this color (8.45:1).
About this color
#17499E is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.148 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.025 away. White text reads best on it, at 8.45:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.48:1 |
| White text | 8.45:1 |
Values
| HEX | #17499E |
| RGB | rgb(23, 73, 158) |
| HSL | hsl(218, 75%, 35%) |
| OKLCH | oklch(42.6% 0.148 260.5) |
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 #17499E | 8.45:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #17499E | 2.48:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #17499E text on white | 8.45:1 | AAA | Lc 88.6 | Fine for body text |
| #17499E text on black | 2.48:1 | Fails | Lc -13.6 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A1C2F9
oklch(81% 0.086 260.5)
-
Step 400
400
#6DA0F6
oklch(70.7% 0.138 260.4)
-
Step 500
500
#4585F3
oklch(63.1% 0.178 260.5)
-
Step 600
600
#266CE1
oklch(55.6% 0.192 260.3)
-
Step 700
700
#1959C4
oklch(49.1% 0.179 260.5)
-
Step 800
800 (this color)
#17499E
oklch(42.6% 0.148 260.5)
-
Step 900
900
#1A3E7E
oklch(37.6% 0.116 260.9)
-
Step 950
950
#10254A
oklch(27% 0.074 260.8)
#17499E 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) | #0553A1 | 0.027 |
| Deuteranopia (no green cones) | #00479C | 0.013 |
| Tritanopia (no blue cones) | #005E6C | 0.114 |
| Achromatopsia (no color) | #4D4D4D | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17499E
#17499E
oklch(42.6% 0.148 260.5)
- #674800
#674800
oklch(42.5% 0.088 80.4)
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 #17499E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.025
- Dusk Blue #26538D ΔE 0.045
- Sapphire #2138AB ΔE 0.046
- Light Navy #155084 ΔE 0.050
- Blueberry #464196 ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.060
- Twilight Blue #0A437A ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.066
Use #17499E 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.