#1B315F
Closest named color: Prussian Blue (#1D3557). oklch(32.2% 0.086 263.2), rgb(27, 49, 95).
Aa
White text reads best on this color (12.71:1).
About this color
#1B315F is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.086 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.021 away. White text reads best on it, at 12.71:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.65:1 |
| White text | 12.71:1 |
Values
| HEX | #1B315F |
| RGB | rgb(27, 49, 95) |
| HSL | hsl(221, 56%, 24%) |
| OKLCH | oklch(32.2% 0.086 263.2) |
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 #1B315F | 12.71:1 | AAA | Lc -101.9 | Preferred for body text |
| Black text on #1B315F | 1.65:1 | Fails | Lc 0.0 | Not readable |
| #1B315F text on white | 12.71:1 | AAA | Lc 98.6 | Preferred for body text |
| #1B315F text on black | 1.65:1 | 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
#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
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6D9DFF
oklch(70.6% 0.153 263.3)
-
Step 500
500
#4681FF
oklch(63.1% 0.198 263.1)
-
Step 600
600
#2464F5
oklch(55.6% 0.227 263.1)
-
Step 700
700
#1851D6
oklch(49.1% 0.212 263.2)
-
Step 800
800
#1644AD
oklch(42.8% 0.175 263.1)
-
Step 900
900
#183B89
oklch(37.8% 0.137 263.2)
-
Step 950
950 (this color)
#1B315F
oklch(32.2% 0.086 263.2)
#1B315F 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) | #1A3661 | 0.015 |
| Deuteranopia (no green cones) | #0E305E | 0.014 |
| Tritanopia (no blue cones) | #003C43 | 0.072 |
| Achromatopsia (no color) | #333333 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B315F
#1B315F
oklch(32.2% 0.086 263.2)
- #443000
#443000
oklch(32.4% 0.067 83.3)
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 #1B315F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.021
- Marine #042E60 ΔE 0.023
- Marine Blue #01386A ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.051
- Midnight Green #073B4C ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.054
- Gunmetal #293241 ΔE 0.057
- Twilight Blue #0A437A ΔE 0.065
Use #1B315F 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.