#18438B
Closest named color: Cobalt (#1E488F). oklch(39.7% 0.129 260.2), rgb(24, 67, 139).
Aa
White text reads best on this color (9.48:1).
About this color
#18438B 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 0.017 away. White text reads best on it, at 9.48:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #18438B |
| RGB | rgb(24, 67, 139) |
| HSL | hsl(218, 71%, 32%) |
| OKLCH | oklch(39.7% 0.129 260.2) |
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 #18438B | 9.48:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #18438B | 2.21:1 | Fails | Lc 12.5 | Not readable |
| #18438B text on white | 9.48:1 | AAA | Lc 91.5 | Preferred for body text |
| #18438B text on black | 2.21:1 | Fails | Lc -10.9 | 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 900.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DAFD
oklch(88.4% 0.054 260.6)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#669FFF
oklch(70.7% 0.154 260.3)
-
Step 500
500
#3A83FF
oklch(63.1% 0.199 260.3)
-
Step 600
600
#1369EE
oklch(55.7% 0.215 260.1)
-
Step 700
700
#0356CF
oklch(49.1% 0.2 260.2)
-
Step 800
800
#0947A7
oklch(42.6% 0.166 260.2)
-
Step 900
900 (this color)
#18438B
oklch(39.7% 0.129 260.2)
-
Step 950
950
#0C244E
oklch(26.9% 0.083 260.7)
#18438B 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) | #154B8E | 0.022 |
| Deuteranopia (no green cones) | #00418A | 0.015 |
| Tritanopia (no blue cones) | #005460 | 0.099 |
| Achromatopsia (no color) | #464646 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18438B
#18438B
oklch(39.7% 0.129 260.2)
- #5E4100
#5E4100
oklch(39.8% 0.082 79.9)
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 #18438B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Twilight Blue #0A437A ΔE 0.031
- Light Navy #155084 ΔE 0.041
- Dusk Blue #26538D ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.054
- Blueberry #464196 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.059
- Sapphire #2138AB ΔE 0.060
Use #18438B 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.