#18334F
Closest named color: Prussian Blue (#1D3557). oklch(31.5% 0.06 251.1), rgb(24, 51, 79).
Aa
White text reads best on this color (12.92:1).
About this color
#18334F is a dark, muted blue. In OKLCH its lightness is 31%, its chroma 0.060 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.017 away. White text reads best on it, at 12.92:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.62:1 |
| White text | 12.92:1 |
Values
| HEX | #18334F |
| RGB | rgb(24, 51, 79) |
| HSL | hsl(211, 53%, 20%) |
| OKLCH | oklch(31.5% 0.06 251.1) |
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 #18334F | 12.92:1 | AAA | Lc -102.3 | Preferred for body text |
| Black text on #18334F | 1.62:1 | Fails | Lc 0.0 | Not readable |
| #18334F text on white | 12.92:1 | AAA | Lc 99.0 | Preferred for body text |
| #18334F text on black | 1.62:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF3
oklch(88.5% 0.04 249.5)
-
Step 300
300
#9FC5EE
oklch(81% 0.071 250.6)
-
Step 400
400
#68A5E6
oklch(70.7% 0.115 251.2)
-
Step 500
500
#3A8DDE
oklch(63.1% 0.146 250.9)
-
Step 600
600
#0875CC
oklch(55.6% 0.159 251.1)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#03508F
oklch(42.7% 0.123 251.2)
-
Step 900
900
#114372
oklch(37.7% 0.096 251)
-
Step 950
950 (this color)
#18334F
oklch(31.5% 0.06 251.1)
#18334F 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) | #273450 | 0.020 |
| Deuteranopia (no green cones) | #1F2F4E | 0.014 |
| Tritanopia (no blue cones) | #003A3D | 0.049 |
| Achromatopsia (no color) | #313131 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18334F
#18334F
oklch(31.5% 0.06 251.1)
- #442C08
#442C08
oklch(31.5% 0.06 72.5)
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 #18334F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.017
- Midnight Green #073B4C ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.030
- Gunmetal #293241 ΔE 0.031
- Space Cadet #2B2D42 ΔE 0.034
- Marine #042E60 ΔE 0.040
- Marine Blue #01386A ΔE 0.048
- Oxford Blue #1B263B ΔE 0.050
Use #18334F 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.