#18458C
Closest named color: Cobalt (#1E488F). oklch(40.3% 0.128 259.5), rgb(24, 69, 140).
Aa
White text reads best on this color (9.25:1).
About this color
#18458C is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.128 and its hue 259°. 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 9.25:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #18458C |
| RGB | rgb(24, 69, 140) |
| HSL | hsl(217, 71%, 32%) |
| OKLCH | oklch(40.3% 0.128 259.5) |
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 #18458C | 9.25:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #18458C | 2.26:1 | Fails | Lc 13.1 | Not readable |
| #18458C text on white | 9.25:1 | AAA | Lc 90.9 | Preferred for body text |
| #18458C text on black | 2.26:1 | Fails | Lc -11.4 | 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
#C9DAF5
oklch(88.4% 0.042 259.6)
-
Step 300
300
#A4C2F1
oklch(80.8% 0.074 259.3)
-
Step 400
400
#73A1EB
oklch(70.7% 0.12 259.6)
-
Step 500
500
#4E88E5
oklch(63.2% 0.153 259.4)
-
Step 600
600
#316FD3
oklch(55.6% 0.167 259.6)
-
Step 700
700
#245CB6
oklch(49% 0.154 259.7)
-
Step 800
800 (this color)
#18458C
oklch(40.3% 0.128 259.5)
-
Step 900
900
#1F4076
oklch(37.7% 0.1 259.8)
-
Step 950
950
#132645
oklch(27.1% 0.063 259.7)
#18458C 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) | #1A4D8F | 0.023 |
| Deuteranopia (no green cones) | #00428B | 0.016 |
| Tritanopia (no blue cones) | #005662 | 0.098 |
| Achromatopsia (no color) | #474747 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18458C
#18458C
oklch(40.3% 0.128 259.5)
- #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 #18458C, 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 0.032
- Light Navy #155084 ΔE 0.036
- Dusk Blue #26538D ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.049
- Blueberry #464196 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.059
- Sapphire #2138AB ΔE 0.061
Use #18458C 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.