#17478F
Closest named color: Cobalt (#1E488F). oklch(40.9% 0.13 258.9), rgb(23, 71, 143).
Aa
White text reads best on this color (8.99:1).
About this color
#17478F is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.130 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.006 away. White text reads best on it, at 8.99:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.33:1 |
| White text | 8.99:1 |
Values
| HEX | #17478F |
| RGB | rgb(23, 71, 143) |
| HSL | hsl(216, 72%, 33%) |
| OKLCH | oklch(40.9% 0.13 258.9) |
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 #17478F | 8.99:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #17478F | 2.33:1 | Fails | Lc 13.8 | Not readable |
| #17478F text on white | 8.99:1 | AAA | Lc 90.2 | Preferred for body text |
| #17478F text on black | 2.33:1 | Fails | Lc -12.1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A3C2F2
oklch(80.8% 0.076 259)
-
Step 400
400
#71A1EC
oklch(70.6% 0.122 259)
-
Step 500
500
#4B88E6
oklch(63.1% 0.156 258.8)
-
Step 600
600
#2D6FD4
oklch(55.5% 0.169 259)
-
Step 700
700
#205DB8
oklch(49.2% 0.157 258.8)
-
Step 800
800 (this color)
#17478F
oklch(40.9% 0.13 258.9)
-
Step 900
900
#1D4076
oklch(37.6% 0.101 258.9)
-
Step 950
950
#122645
oklch(27% 0.064 258.9)
#17478F 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) | #1C4F92 | 0.024 |
| Deuteranopia (no green cones) | #00448E | 0.015 |
| Tritanopia (no blue cones) | #005864 | 0.099 |
| Achromatopsia (no color) | #494949 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17478F
#17478F
oklch(40.9% 0.13 258.9)
- #634400
#634400
oklch(41.1% 0.085 79.1)
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 #17478F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.006
- Light Navy #155084 ΔE 0.034
- Twilight Blue #0A437A ΔE 0.038
- Dusk Blue #26538D ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.047
- Blueberry #464196 ΔE 0.056
- Sapphire #2138AB ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.060
Use #17478F 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.