#182258
Closest named color: Marine (#042E60). oklch(28% 0.098 270.8), rgb(24, 34, 88).
Aa
White text reads best on this color (14.90:1).
About this color
#182258 is a dark, moderately saturated blue. In OKLCH its lightness is 28%, its chroma 0.098 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.037 away. White text reads best on it, at 14.90:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.40:1 |
| White text | 14.90:1 |
Values
| HEX | #182258 |
| RGB | rgb(24, 34, 88) |
| HSL | hsl(231, 57%, 22%) |
| OKLCH | oklch(28% 0.098 270.8) |
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 #182258 | 14.90:1 | AAA | Lc -104.4 | Preferred for body text |
| Black text on #182258 | 1.40:1 | Fails | Lc 0.0 | Not readable |
| #182258 text on white | 14.90:1 | AAA | Lc 101.5 | Preferred for body text |
| #182258 text on black | 1.40:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7E99FF
oklch(70.7% 0.152 270.9)
-
Step 500
500
#5F7BFF
oklch(63.1% 0.198 270.7)
-
Step 600
600
#4558FF
oklch(55.6% 0.245 270.7)
-
Step 700
700
#3742E5
oklch(49.1% 0.24 270.7)
-
Step 800
800
#2D38B9
oklch(42.7% 0.199 270.9)
-
Step 900
900
#263392
oklch(37.6% 0.156 270.7)
-
Step 950
950 (this color)
#182258
oklch(28% 0.098 270.8)
#182258 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) | #002A5A | 0.028 |
| Deuteranopia (no green cones) | #002457 | 0.023 |
| Tritanopia (no blue cones) | #002F39 | 0.080 |
| Achromatopsia (no color) | #272727 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #182258
#182258
oklch(28% 0.098 270.8)
- #332700
#332700
oklch(27.9% 0.057 91)
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 #182258, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.037
- Midnight Blue #191970 ΔE 0.047
- Dark Indigo #1F0954 ΔE 0.055
- Oxford Blue #1B263B ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.066
- Marine Blue #01386A ΔE 0.068
- Darkblue #030764 ΔE 0.068
Use #182258 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.