#1C3173
Closest named color: Marine Blue (#01386A). oklch(33.9% 0.117 266.7), rgb(28, 49, 115).
Aa
White text reads best on this color (12.09:1).
About this color
#1C3173 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.117 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.031 away. White text reads best on it, at 12.09:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.73:1 |
| White text | 12.09:1 |
Values
| HEX | #1C3173 |
| RGB | rgb(28, 49, 115) |
| HSL | hsl(226, 61%, 28%) |
| OKLCH | oklch(33.9% 0.117 266.7) |
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 #1C3173 | 12.09:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #1C3173 | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #1C3173 text on white | 12.09:1 | AAA | Lc 97.3 | Preferred for body text |
| #1C3173 text on black | 1.73:1 | 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
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A7C0FA
oklch(81% 0.087 266.4)
-
Step 400
400
#799CF8
oklch(70.7% 0.141 267)
-
Step 500
500
#5881F4
oklch(63.2% 0.178 266.6)
-
Step 600
600
#3F67E3
oklch(55.7% 0.194 266.5)
-
Step 700
700
#3254C5
oklch(49% 0.181 266.8)
-
Step 800
800
#2946A0
oklch(42.8% 0.15 266.5)
-
Step 900
900 (this color)
#1C3173
oklch(33.9% 0.117 266.7)
-
Step 950
950
#16244A
oklch(27.1% 0.073 266.4)
#1C3173 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) | #003A75 | 0.028 |
| Deuteranopia (no green cones) | #003272 | 0.021 |
| Tritanopia (no blue cones) | #00414D | 0.093 |
| Achromatopsia (no color) | #363636 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C3173
#1C3173
oklch(33.9% 0.117 266.7)
- #473500
#473500
oklch(34% 0.069 87.5)
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 #1C3173, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.031
- Marine #042E60 ΔE 0.041
- Twilight Blue #0A437A ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.052
- Midnight Blue #191970 ΔE 0.059
- Cobalt #1E488F ΔE 0.077
- Royal #0C1793 ΔE 0.077
- Dark Blue Grey #1F3B4D ΔE 0.079
Use #1C3173 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.