#18458D
Closest named color: Cobalt (#1E488F). oklch(40.4% 0.129 259.7), rgb(24, 69, 141).
Aa
White text reads best on this color (9.23:1).
About this color
#18458D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.129 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.011 away. White text reads best on it, at 9.23:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #18458D |
| RGB | rgb(24, 69, 141) |
| HSL | hsl(217, 71%, 32%) |
| OKLCH | oklch(40.4% 0.129 259.7) |
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 #18458D | 9.23:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #18458D | 2.27:1 | Fails | Lc 13.1 | Not readable |
| #18458D text on white | 9.23:1 | AAA | Lc 90.8 | Preferred for body text |
| #18458D text on black | 2.27:1 | Fails | Lc -11.5 | 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
#A4C2F2
oklch(80.9% 0.076 259.7)
-
Step 400
400
#73A1EC
oklch(70.7% 0.121 259.8)
-
Step 500
500
#4E87E6
oklch(63.1% 0.156 260)
-
Step 600
600
#316FD4
oklch(55.6% 0.168 259.8)
-
Step 700
700
#235CB7
oklch(49% 0.156 259.6)
-
Step 800
800 (this color)
#18458D
oklch(40.4% 0.129 259.7)
-
Step 900
900
#1F4076
oklch(37.7% 0.1 259.8)
-
Step 950
950
#132645
oklch(27.1% 0.063 259.7)
#18458D 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) | #194D90 | 0.023 |
| Deuteranopia (no green cones) | #00428C | 0.016 |
| Tritanopia (no blue cones) | #005662 | 0.099 |
| Achromatopsia (no color) | #474747 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18458D
#18458D
oklch(40.4% 0.129 259.7)
- #604200
#604200
oklch(40.2% 0.084 79.3)
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 #18458D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.011
- Twilight Blue #0A437A ΔE 0.034
- Light Navy #155084 ΔE 0.037
- Dusk Blue #26538D ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.050
- Blueberry #464196 ΔE 0.057
- Sapphire #2138AB ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.059
Use #18458D 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.