#1B2C78
Closest named color: Marine Blue (#01386A). oklch(33.2% 0.131 268.5), rgb(27, 44, 120).
Aa
White text reads best on this color (12.51:1).
About this color
#1B2C78 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.131 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.044 away. White text reads best on it, at 12.51:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.67:1 |
| White text | 12.51:1 |
Values
| HEX | #1B2C78 |
| RGB | rgb(27, 44, 120) |
| HSL | hsl(229, 63%, 29%) |
| OKLCH | oklch(33.2% 0.131 268.5) |
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 #1B2C78 | 12.51:1 | AAA | Lc -101.4 | Preferred for body text |
| Black text on #1B2C78 | 1.67:1 | Fails | Lc 0.0 | Not readable |
| #1B2C78 text on white | 12.51:1 | AAA | Lc 97.9 | Preferred for body text |
| #1B2C78 text on black | 1.67:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2EAFE
oklch(93.7% 0.028 268.4)
-
Step 200
200
#CAD9FE
oklch(88.6% 0.054 267.9)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#799AFF
oklch(70.6% 0.153 268.6)
-
Step 500
500
#587DFF
oklch(63.1% 0.197 268.3)
-
Step 600
600
#4061F1
oklch(55.7% 0.219 268.3)
-
Step 700
700
#334FD1
oklch(49.1% 0.202 268.3)
-
Step 800
800
#2A41A9
oklch(42.6% 0.169 268.5)
-
Step 900
900 (this color)
#1B2C78
oklch(33.2% 0.131 268.5)
-
Step 950
950
#16224E
oklch(26.9% 0.083 268.8)
#1B2C78 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) | #00387A | 0.033 |
| Deuteranopia (no green cones) | #002F77 | 0.020 |
| Tritanopia (no blue cones) | #003F4D | 0.103 |
| Achromatopsia (no color) | #343434 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2C78
#1B2C78
oklch(33.2% 0.131 268.5)
- #443300
#443300
oklch(33.1% 0.068 88.1)
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 #1B2C78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.044
- Midnight Blue #191970 ΔE 0.047
- Marine #042E60 ΔE 0.047
- Royal #0C1793 ΔE 0.062
- Twilight Blue #0A437A ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.066
- Dark Blue #00008B ΔE 0.082
- Cobalt #1E488F ΔE 0.084
Use #1B2C78 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.