#183690
Closest named color: Sapphire (#2138AB). oklch(37.4% 0.153 265.3), rgb(24, 54, 144).
Aa
White text reads best on this color (10.66:1).
About this color
#183690 is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.153 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.046 away. White text reads best on it, at 10.66:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.96:1 |
| White text | 10.66:1 |
Values
| HEX | #183690 |
| RGB | rgb(24, 54, 144) |
| HSL | hsl(225, 71%, 33%) |
| OKLCH | oklch(37.4% 0.153 265.3) |
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 #183690 | 10.66:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #183690 | 1.96:1 | Fails | Lc 9.8 | Not readable |
| #183690 text on white | 10.66:1 | AAA | Lc 94.1 | Preferred for body text |
| #183690 text on black | 1.96:1 | Fails | Lc -8.5 | 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 900.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#729CFF
oklch(70.6% 0.153 265.4)
-
Step 500
500
#4E7FFF
oklch(63% 0.198 265.3)
-
Step 600
600
#2B5EFF
oklch(55.6% 0.244 265.2)
-
Step 700
700
#1D49E4
oklch(49.1% 0.237 265.2)
-
Step 800
800
#193EB8
oklch(42.8% 0.196 265.2)
-
Step 900
900 (this color)
#183690
oklch(37.4% 0.153 265.3)
-
Step 950
950
#0F2155
oklch(26.9% 0.098 265.6)
#183690 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) | #004493 | 0.036 |
| Deuteranopia (no green cones) | #00398E | 0.014 |
| Tritanopia (no blue cones) | #004D5D | 0.118 |
| Achromatopsia (no color) | #3E3E3E | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183690
#183690
oklch(37.4% 0.153 265.3)
- #533D00
#533D00
oklch(37.4% 0.077 85.6)
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 #183690, closest first.
No curated palette has a color within ΔE 0.04 of #183690.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.046
- Cobalt #1E488F ΔE 0.049
- Twilight Blue #0A437A ΔE 0.053
- Royal #0C1793 ΔE 0.065
- Marine Blue #01386A ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.070
- Blueberry #464196 ΔE 0.071
- Light Navy #155084 ΔE 0.077
Use #183690 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.