#17479D
Closest named color: Cobalt (#1E488F). oklch(42.1% 0.15 261), rgb(23, 71, 157).
Aa
White text reads best on this color (8.66:1).
About this color
#17479D is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.150 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.024 away. White text reads best on it, at 8.66:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.42:1 |
| White text | 8.66:1 |
Values
| HEX | #17479D |
| RGB | rgb(23, 71, 157) |
| HSL | hsl(219, 74%, 35%) |
| OKLCH | oklch(42.1% 0.15 261) |
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 #17479D | 8.66:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #17479D | 2.42:1 | Fails | Lc 14.8 | Not readable |
| #17479D text on white | 8.66:1 | AAA | Lc 89.2 | Fine for body text |
| #17479D text on black | 2.42:1 | Fails | Lc -13.1 | 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
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A1C2FA
oklch(81% 0.087 260.8)
-
Step 400
400
#6E9FF7
oklch(70.6% 0.14 261.4)
-
Step 500
500
#4785F4
oklch(63.2% 0.179 261)
-
Step 600
600
#286BE2
oklch(55.6% 0.194 260.9)
-
Step 700
700
#1B58C5
oklch(49% 0.181 261.1)
-
Step 800
800 (this color)
#17479D
oklch(42.1% 0.15 261)
-
Step 900
900
#1A3E7E
oklch(37.6% 0.116 260.9)
-
Step 950
950
#10254A
oklch(27% 0.074 260.8)
#17479D 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) | #0052A0 | 0.029 |
| Deuteranopia (no green cones) | #00469B | 0.012 |
| Tritanopia (no blue cones) | #005C6B | 0.114 |
| Achromatopsia (no color) | #4B4B4B | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17479D
#17479D
oklch(42.1% 0.15 261)
- #654700
#654700
oklch(42% 0.087 81)
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 #17479D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Sapphire #2138AB ΔE 0.042
- Dusk Blue #26538D ΔE 0.048
- Light Navy #155084 ΔE 0.051
- Blueberry #464196 ΔE 0.054
- Twilight Blue #0A437A ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.064
Use #17479D 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.