#1C3D7C
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.114 261.8), rgb(28, 61, 124).
Aa
White text reads best on this color (10.45:1).
About this color
#1C3D7C is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.114 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.020 away. White text reads best on it, at 10.45:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.45:1 |
Values
| HEX | #1C3D7C |
| RGB | rgb(28, 61, 124) |
| HSL | hsl(219, 63%, 30%) |
| OKLCH | oklch(37.3% 0.114 261.8) |
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 #1C3D7C | 10.45:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #1C3D7C | 2.00:1 | Fails | Lc 10.0 | Not readable |
| #1C3D7C text on white | 10.45:1 | AAA | Lc 93.9 | Preferred for body text |
| #1C3D7C text on black | 2.00:1 | Fails | Lc -8.6 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A2C1F9
oklch(80.8% 0.087 262)
-
Step 400
400
#709FF6
oklch(70.7% 0.138 261.9)
-
Step 500
500
#4B84F2
oklch(63.1% 0.176 262)
-
Step 600
600
#2E6BE0
oklch(55.6% 0.19 261.7)
-
Step 700
700
#2158C3
oklch(49% 0.177 261.9)
-
Step 800
800
#1D499E
oklch(42.8% 0.147 261.8)
-
Step 900
900 (this color)
#1C3D7C
oklch(37.3% 0.114 261.8)
-
Step 950
950
#122549
oklch(27% 0.071 261.9)
#1C3D7C 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) | #19447E | 0.020 |
| Deuteranopia (no green cones) | #003B7B | 0.020 |
| Tritanopia (no blue cones) | #004C56 | 0.090 |
| Achromatopsia (no color) | #3F3F3F | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C3D7C
#1C3D7C
oklch(37.3% 0.114 261.8)
- #553C00
#553C00
oklch(37.4% 0.077 82.1)
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 #1C3D7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.020
- Marine Blue #01386A ΔE 0.040
- Cobalt #1E488F ΔE 0.043
- Light Navy #155084 ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.066
- Deep Sea Blue #015482 ΔE 0.066
- Marine #042E60 ΔE 0.069
Use #1C3D7C 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.