#183059
Closest named color: Prussian Blue (#1D3557). oklch(31.4% 0.08 260.4), rgb(24, 48, 89).
Aa
White text reads best on this color (13.07:1).
About this color
#183059 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.080 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.019 away. White text reads best on it, at 13.07:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.60:1 |
| White text | 13.07:1 |
Values
| HEX | #183059 |
| RGB | rgb(24, 48, 89) |
| HSL | hsl(218, 58%, 22%) |
| OKLCH | oklch(31.4% 0.08 260.4) |
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 #183059 | 13.07:1 | AAA | Lc -102.4 | Preferred for body text |
| Black text on #183059 | 1.60:1 | Fails | Lc 0.0 | Not readable |
| #183059 text on white | 13.07:1 | AAA | Lc 99.1 | Preferred for body text |
| #183059 text on black | 1.60:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFD
oklch(93.7% 0.027 260.3)
-
Step 200
200
#C6DAFD
oklch(88.5% 0.053 261.7)
-
Step 300
300
#9EC2FE
oklch(81% 0.094 260.4)
-
Step 400
400
#689FFE
oklch(70.7% 0.151 260.7)
-
Step 500
500
#3D84FC
oklch(63.2% 0.193 260.3)
-
Step 600
600
#1A69EB
oklch(55.6% 0.21 260.5)
-
Step 700
700
#0C57CC
oklch(49.2% 0.194 260.3)
-
Step 800
800
#0F48A5
oklch(42.8% 0.161 260.4)
-
Step 900
900
#153D83
oklch(37.6% 0.126 260.7)
-
Step 950
950 (this color)
#183059
oklch(31.4% 0.08 260.4)
#183059 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) | #1D345B | 0.015 |
| Deuteranopia (no green cones) | #122E58 | 0.010 |
| Tritanopia (no blue cones) | #003940 | 0.063 |
| Achromatopsia (no color) | #313131 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #183059
#183059
oklch(31.4% 0.08 260.4)
- #422D00
#422D00
oklch(31.4% 0.065 80.7)
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 #183059, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.019
- Marine #042E60 ΔE 0.022
- Marine Blue #01386A ΔE 0.036
- Space Cadet #2B2D42 ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.048
- Midnight Green #073B4C ΔE 0.048
- Gunmetal #293241 ΔE 0.050
- Oxford Blue #1B263B ΔE 0.058
Use #183059 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.