#18478B
Closest named color: Cobalt (#1E488F). oklch(40.7% 0.124 258.3), rgb(24, 71, 139).
Aa
White text reads best on this color (9.07:1).
About this color
#18478B is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.124 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.009 away. White text reads best on it, at 9.07:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.31:1 |
| White text | 9.07:1 |
Values
| HEX | #18478B |
| RGB | rgb(24, 71, 139) |
| HSL | hsl(215, 71%, 32%) |
| OKLCH | oklch(40.7% 0.124 258.3) |
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 #18478B | 9.07:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #18478B | 2.31:1 | Fails | Lc 13.5 | Not readable |
| #18478B text on white | 9.07:1 | AAA | Lc 90.4 | Preferred for body text |
| #18478B text on black | 2.31:1 | Fails | Lc -11.9 | 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
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DAF4
oklch(88.4% 0.04 258.8)
-
Step 300
300
#A4C2F0
oklch(80.8% 0.073 258.8)
-
Step 400
400
#73A2E8
oklch(70.8% 0.115 258.1)
-
Step 500
500
#4D89E2
oklch(63.2% 0.148 258.2)
-
Step 600
600
#3070CF
oklch(55.5% 0.161 258.5)
-
Step 700
700
#225EB4
oklch(49.2% 0.15 258.2)
-
Step 800
800 (this color)
#18478B
oklch(40.7% 0.124 258.3)
-
Step 900
900
#1E4174
oklch(37.8% 0.096 258)
-
Step 950
950
#122644
oklch(26.9% 0.062 258.3)
#18478B 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) | #204E8E | 0.022 |
| Deuteranopia (no green cones) | #00448A | 0.016 |
| Tritanopia (no blue cones) | #005762 | 0.095 |
| Achromatopsia (no color) | #484848 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18478B
#18478B
oklch(40.7% 0.124 258.3)
- #624300
#624300
oklch(40.7% 0.085 78.8)
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 #18478B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.009
- Light Navy #155084 ΔE 0.030
- Twilight Blue #0A437A ΔE 0.032
- Dusk Blue #26538D ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.043
- Blueberry #464196 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.063
Use #18478B 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.