#1C3377
Closest named color: Marine Blue (#01386A). oklch(34.7% 0.12 266.1), rgb(28, 51, 119).
Aa
White text reads best on this color (11.73:1).
About this color
#1C3377 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.120 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.033 away. White text reads best on it, at 11.73:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.78:1 |
| White text | 11.73:1 |
Values
| HEX | #1C3377 |
| RGB | rgb(28, 51, 119) |
| HSL | hsl(225, 62%, 29%) |
| OKLCH | oklch(34.7% 0.12 266.1) |
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 #1C3377 | 11.73:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #1C3377 | 1.78:1 | Fails | Lc 7.3 | Not readable |
| #1C3377 text on white | 11.73:1 | AAA | Lc 96.5 | Preferred for body text |
| #1C3377 text on black | 1.78:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A5C0FC
oklch(80.9% 0.09 265.7)
-
Step 400
400
#769CFA
oklch(70.6% 0.144 266.2)
-
Step 500
500
#5580F7
oklch(63% 0.184 266.3)
-
Step 600
600
#3C66E6
oklch(55.6% 0.2 266.2)
-
Step 700
700
#2F54C8
oklch(49.1% 0.185 266.1)
-
Step 800
800
#2745A2
oklch(42.6% 0.155 266.3)
-
Step 900
900 (this color)
#1C3377
oklch(34.7% 0.12 266.1)
-
Step 950
950
#15244B
oklch(27.1% 0.075 265.8)
#1C3377 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) | #003C79 | 0.028 |
| Deuteranopia (no green cones) | #003476 | 0.020 |
| Tritanopia (no blue cones) | #00444F | 0.097 |
| Achromatopsia (no color) | #383838 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C3377
#1C3377
oklch(34.7% 0.12 266.1)
- #4A3600
#4A3600
oklch(34.6% 0.071 85.5)
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 #1C3377, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.033
- Twilight Blue #0A437A ΔE 0.045
- Marine #042E60 ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.057
- Midnight Blue #191970 ΔE 0.065
- Cobalt #1E488F ΔE 0.069
- Royal #0C1793 ΔE 0.076
- Dark Slate Blue #483D8B ΔE 0.080
Use #1C3377 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.