#183984
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.132 263.4), rgb(24, 57, 132).
Aa
White text reads best on this color (10.72:1).
About this color
#183984 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.132 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.72:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.72:1 |
Values
| HEX | #183984 |
| RGB | rgb(24, 57, 132) |
| HSL | hsl(222, 69%, 31%) |
| OKLCH | oklch(36.9% 0.132 263.4) |
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 #183984 | 10.72:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #183984 | 1.95:1 | Fails | Lc 9.5 | Not readable |
| #183984 text on white | 10.72:1 | AAA | Lc 94.4 | Preferred for body text |
| #183984 text on black | 1.95:1 | Fails | Lc -8.2 | 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
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A1C1FF
oklch(81% 0.095 263.3)
-
Step 400
400
#6E9DFF
oklch(70.6% 0.153 263.6)
-
Step 500
500
#4781FF
oklch(63.2% 0.197 263.3)
-
Step 600
600
#2965F1
oklch(55.6% 0.22 263.4)
-
Step 700
700
#1D52D2
oklch(49% 0.205 263.5)
-
Step 800
800
#1944AA
oklch(42.6% 0.171 263.5)
-
Step 900
900 (this color)
#183984
oklch(36.9% 0.132 263.4)
-
Step 950
950
#10234F
oklch(26.9% 0.085 264)
#183984 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) | #004387 | 0.028 |
| Deuteranopia (no green cones) | #003983 | 0.014 |
| Tritanopia (no blue cones) | #004C58 | 0.105 |
| Achromatopsia (no color) | #3E3E3E | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183984
#183984
oklch(36.9% 0.132 263.4)
- #533B00
#533B00
oklch(36.9% 0.076 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 #183984, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Cobalt #1E488F ΔE 0.046
- Marine Blue #01386A ΔE 0.048
- Sapphire #2138AB ΔE 0.065
- Light Navy #155084 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.068
- Marine #042E60 ΔE 0.072
- Blueberry #464196 ΔE 0.073
Use #183984 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.