#18408B
Closest named color: Cobalt (#1E488F). oklch(39.1% 0.133 261.5), rgb(24, 64, 139).
Aa
White text reads best on this color (9.79:1).
About this color
#18408B is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.133 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 9.79:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.14:1 |
| White text | 9.79:1 |
Values
| HEX | #18408B |
| RGB | rgb(24, 64, 139) |
| HSL | hsl(219, 71%, 32%) |
| OKLCH | oklch(39.1% 0.133 261.5) |
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 #18408B | 9.79:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #18408B | 2.14:1 | Fails | Lc 11.7 | Not readable |
| #18408B text on white | 9.79:1 | AAA | Lc 92.2 | Preferred for body text |
| #18408B text on black | 2.14:1 | Fails | Lc -10.2 | 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 900.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEBFE
oklch(93.7% 0.029 259.6)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#699EFF
oklch(70.6% 0.153 261.6)
-
Step 500
500
#3F82FF
oklch(63.1% 0.198 261.5)
-
Step 600
600
#1A66F2
oklch(55.5% 0.222 261.5)
-
Step 700
700
#0D54D3
oklch(49.2% 0.206 261.5)
-
Step 800
800
#0F46AA
oklch(42.8% 0.17 261.4)
-
Step 900
900 (this color)
#18408B
oklch(39.1% 0.133 261.5)
-
Step 950
950
#0D244F
oklch(27% 0.084 261.5)
#18408B 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) | #08498E | 0.025 |
| Deuteranopia (no green cones) | #003F8A | 0.014 |
| Tritanopia (no blue cones) | #00525F | 0.102 |
| Achromatopsia (no color) | #444444 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18408B
#18408B
oklch(39.1% 0.133 261.5)
- #5B4000
#5B4000
oklch(39.1% 0.081 81.5)
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 #18408B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Twilight Blue #0A437A ΔE 0.032
- Light Navy #155084 ΔE 0.049
- Sapphire #2138AB ΔE 0.056
- Dusk Blue #26538D ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.060
- Blueberry #464196 ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.062
Use #18408B 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.