#1B316A
Closest named color: Marine Blue (#01386A). oklch(33.1% 0.104 265.3), rgb(27, 49, 106).
Aa
White text reads best on this color (12.39:1).
About this color
#1B316A is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.104 and its hue 265°. 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 12.39:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.69:1 |
| White text | 12.39:1 |
Values
| HEX | #1B316A |
| RGB | rgb(27, 49, 106) |
| HSL | hsl(223, 59%, 26%) |
| OKLCH | oklch(33.1% 0.104 265.3) |
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 #1B316A | 12.39:1 | AAA | Lc -101.4 | Preferred for body text |
| Black text on #1B316A | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #1B316A text on white | 12.39:1 | AAA | Lc 97.9 | Preferred for body text |
| #1B316A text on black | 1.69:1 | 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CBD9F7
oklch(88.4% 0.044 265.6)
-
Step 300
300
#A8C0F4
oklch(80.8% 0.079 265.4)
-
Step 400
400
#7B9EEE
oklch(70.7% 0.124 265.4)
-
Step 500
500
#5A84E9
oklch(63.2% 0.159 265.2)
-
Step 600
600
#416BD7
oklch(55.7% 0.172 265.2)
-
Step 700
700
#3358BA
oklch(49% 0.161 265.3)
-
Step 800
800
#2B4997
oklch(42.8% 0.133 265.3)
-
Step 900
900 (this color)
#1B316A
oklch(33.1% 0.104 265.3)
-
Step 950
950
#172546
oklch(27.1% 0.064 265.1)
#1B316A 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) | #0E386C | 0.021 |
| Deuteranopia (no green cones) | #003169 | 0.021 |
| Tritanopia (no blue cones) | #003F48 | 0.085 |
| Achromatopsia (no color) | #343434 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B316A
#1B316A
oklch(33.1% 0.104 265.3)
- #453200
#453200
oklch(33% 0.068 85.3)
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 #1B316A, 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 0.029
- Prussian Blue #1D3557 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.055
- Midnight Blue #191970 ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.066
- Midnight Green #073B4C ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.072
Use #1B316A 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.