#1B316C
Closest named color: Marine Blue (#01386A). oklch(33.2% 0.107 265.5), rgb(27, 49, 108).
Aa
White text reads best on this color (12.33:1).
About this color
#1B316C is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.107 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.025 away. White text reads best on it, at 12.33:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.70:1 |
| White text | 12.33:1 |
Values
| HEX | #1B316C |
| RGB | rgb(27, 49, 108) |
| HSL | hsl(224, 60%, 26%) |
| OKLCH | oklch(33.2% 0.107 265.5) |
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 #1B316C | 12.33:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #1B316C | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #1B316C text on white | 12.33:1 | AAA | Lc 97.8 | Preferred for body text |
| #1B316C text on black | 1.70:1 | 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 900.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBD9F7
oklch(88.4% 0.044 265.6)
-
Step 300
300
#A8C0F5
oklch(80.9% 0.08 265.7)
-
Step 400
400
#7A9EF0
oklch(70.7% 0.127 265.3)
-
Step 500
500
#5983EB
oklch(63% 0.163 265.4)
-
Step 600
600
#406ADA
oklch(55.6% 0.178 265.5)
-
Step 700
700
#3358BD
oklch(49.2% 0.165 265.5)
-
Step 800
800
#2A4899
oklch(42.7% 0.137 265.6)
-
Step 900
900 (this color)
#1B316C
oklch(33.2% 0.107 265.5)
-
Step 950
950
#162447
oklch(26.9% 0.068 265.6)
#1B316C 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) | #0B396E | 0.024 |
| Deuteranopia (no green cones) | #00316B | 0.021 |
| Tritanopia (no blue cones) | #003F49 | 0.086 |
| Achromatopsia (no color) | #353535 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B316C
#1B316C
oklch(33.2% 0.107 265.5)
- #463300
#463300
oklch(33.4% 0.068 85.7)
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 #1B316C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.025
- Marine #042E60 ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.041
- Twilight Blue #0A437A ΔE 0.054
- Midnight Blue #191970 ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.069
- Midnight Green #073B4C ΔE 0.072
- Space Cadet #2B2D42 ΔE 0.076
Use #1B316C 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.