#1B3367
Closest named color: Marine Blue (#01386A). oklch(33.3% 0.096 263.4), rgb(27, 51, 103).
Aa
White text reads best on this color (12.23:1).
About this color
#1B3367 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.096 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.021 away. White text reads best on it, at 12.23:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.71:1 |
| White text | 12.23:1 |
Values
| HEX | #1B3367 |
| RGB | rgb(27, 51, 103) |
| HSL | hsl(221, 58%, 25%) |
| OKLCH | oklch(33.3% 0.096 263.4) |
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 #1B3367 | 12.23:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #1B3367 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #1B3367 text on white | 12.23:1 | AAA | Lc 97.6 | Preferred for body text |
| #1B3367 text on black | 1.71:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF4
oklch(88.6% 0.039 262.9)
-
Step 300
300
#A9C1F0
oklch(80.9% 0.072 263.7)
-
Step 400
400
#7B9FE9
oklch(70.6% 0.116 263.9)
-
Step 500
500
#5A86E2
oklch(63.2% 0.147 263.5)
-
Step 600
600
#406DD0
oklch(55.5% 0.161 263.6)
-
Step 700
700
#325BB4
oklch(49.1% 0.149 263.3)
-
Step 800
800
#2A4B92
oklch(42.8% 0.123 263.4)
-
Step 900
900 (this color)
#1B3367
oklch(33.3% 0.096 263.4)
-
Step 950
950
#162544
oklch(26.9% 0.061 263.4)
#1B3367 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) | #173969 | 0.018 |
| Deuteranopia (no green cones) | #053266 | 0.018 |
| Tritanopia (no blue cones) | #003F48 | 0.077 |
| Achromatopsia (no color) | #353535 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3367
#1B3367
oklch(33.3% 0.096 263.4)
- #473200
#473200
oklch(33.3% 0.068 82.8)
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 #1B3367, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.021
- Marine #042E60 ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.030
- Twilight Blue #0A437A ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.058
- Midnight Green #073B4C ΔE 0.061
- Space Cadet #2B2D42 ΔE 0.067
- Midnight Blue #191970 ΔE 0.068
Use #1B3367 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.