#1C3C73
Closest named color: Twilight Blue (#0A437A). oklch(36.4% 0.102 260.5), rgb(28, 60, 115).
Aa
White text reads best on this color (10.80:1).
About this color
#1C3C73 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.102 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.80:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #1C3C73 |
| RGB | rgb(28, 60, 115) |
| HSL | hsl(218, 61%, 28%) |
| OKLCH | oklch(36.4% 0.102 260.5) |
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 #1C3C73 | 10.80:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #1C3C73 | 1.94:1 | Fails | Lc 9.2 | Not readable |
| #1C3C73 text on white | 10.80:1 | AAA | Lc 94.7 | Preferred for body text |
| #1C3C73 text on black | 1.94:1 | Fails | Lc -7.9 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A4C2F3
oklch(80.9% 0.077 260.1)
-
Step 400
400
#73A1ED
oklch(70.8% 0.123 260.1)
-
Step 500
500
#4F87E7
oklch(63.2% 0.157 260.5)
-
Step 600
600
#326ED5
oklch(55.5% 0.171 260.5)
-
Step 700
700
#255CB9
oklch(49.2% 0.158 260.3)
-
Step 800
800
#204B95
oklch(42.6% 0.131 260.5)
-
Step 900
900 (this color)
#1C3C73
oklch(36.4% 0.102 260.5)
-
Step 950
950
#132646
oklch(27.1% 0.065 260.2)
#1C3C73 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) | #204275 | 0.019 |
| Deuteranopia (no green cones) | #0D3A72 | 0.014 |
| Tritanopia (no blue cones) | #004952 | 0.080 |
| Achromatopsia (no color) | #3D3D3D | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C3C73
#1C3C73
oklch(36.4% 0.102 260.5)
- #523900
#523900
oklch(36.4% 0.075 81)
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 #1C3C73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.050
- Cobalt #1E488F ΔE 0.056
- Marine #042E60 ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.059
- Light Navy #155084 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.067
Use #1C3C73 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.