#18409D
Closest named color: Sapphire (#2138AB). oklch(40.6% 0.158 263.4), rgb(24, 64, 157).
Aa
White text reads best on this color (9.29:1).
About this color
#18409D is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.158 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.029 away. White text reads best on it, at 9.29:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.25:1 |
| White text | 9.29:1 |
Values
| HEX | #18409D |
| RGB | rgb(24, 64, 157) |
| HSL | hsl(222, 73%, 35%) |
| OKLCH | oklch(40.6% 0.158 263.4) |
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 #18409D | 9.29:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #18409D | 2.25:1 | Fails | Lc 13.1 | Not readable |
| #18409D text on white | 9.29:1 | AAA | Lc 90.8 | Preferred for body text |
| #18409D text on black | 2.25:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C8DAFC
oklch(88.6% 0.051 263.2)
-
Step 300
300
#A2C1FD
oklch(81% 0.092 263.3)
-
Step 400
400
#6F9EFC
oklch(70.7% 0.147 263)
-
Step 500
500
#4A82FA
oklch(63.1% 0.189 263.2)
-
Step 600
600
#2F67E9
oklch(55.5% 0.206 263.5)
-
Step 700
700
#2255CB
oklch(49.1% 0.191 263.4)
-
Step 800
800 (this color)
#18409D
oklch(40.6% 0.158 263.4)
-
Step 900
900
#1D3C82
oklch(37.6% 0.124 263.6)
-
Step 950
950
#11244C
oklch(27% 0.078 263.1)
#18409D 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) | #004DA0 | 0.033 |
| Deuteranopia (no green cones) | #00419B | 0.012 |
| Tritanopia (no blue cones) | #005868 | 0.123 |
| Achromatopsia (no color) | #474747 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18409D
#18409D
oklch(40.6% 0.158 263.4)
- #5F4400
#5F4400
oklch(40.6% 0.083 82.8)
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 #18409D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.029
- Cobalt #1E488F ΔE 0.033
- Blueberry #464196 ΔE 0.057
- Twilight Blue #0A437A ΔE 0.061
- Dusk Blue #26538D ΔE 0.064
- Light Navy #155084 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.065
- Blue Blue #2242C7 ΔE 0.069
Use #18409D 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.