#1C3A77
Closest named color: Twilight Blue (#0A437A). oklch(36.3% 0.111 262.5), rgb(28, 58, 119).
Aa
White text reads best on this color (10.93:1).
About this color
#1C3A77 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.111 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.026 away. White text reads best on it, at 10.93:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.92:1 |
| White text | 10.93:1 |
Values
| HEX | #1C3A77 |
| RGB | rgb(28, 58, 119) |
| HSL | hsl(220, 62%, 29%) |
| OKLCH | oklch(36.3% 0.111 262.5) |
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 #1C3A77 | 10.93:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #1C3A77 | 1.92:1 | Fails | Lc 8.9 | Not readable |
| #1C3A77 text on white | 10.93:1 | AAA | Lc 95.0 | Preferred for body text |
| #1C3A77 text on black | 1.92:1 | Fails | Lc -7.7 | 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
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A4C1F7
oklch(80.9% 0.083 262.6)
-
Step 400
400
#739FF3
oklch(70.7% 0.133 262.5)
-
Step 500
500
#4F84EF
oklch(63% 0.171 262.7)
-
Step 600
600
#346BDD
oklch(55.6% 0.184 262.6)
-
Step 700
700
#2759C0
oklch(49.2% 0.171 262.5)
-
Step 800
800
#21499B
oklch(42.7% 0.142 262.5)
-
Step 900
900 (this color)
#1C3A77
oklch(36.3% 0.111 262.5)
-
Step 950
950
#132548
oklch(27% 0.069 262.3)
#1C3A77 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) | #174179 | 0.020 |
| Deuteranopia (no green cones) | #003976 | 0.019 |
| Tritanopia (no blue cones) | #004852 | 0.088 |
| Achromatopsia (no color) | #3D3D3D | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C3A77
#1C3A77
oklch(36.3% 0.111 262.5)
- #513900
#513900
oklch(36.2% 0.075 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 #1C3A77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.026
- Marine Blue #01386A ΔE 0.031
- Cobalt #1E488F ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.056
- Marine #042E60 ΔE 0.058
- Light Navy #155084 ΔE 0.065
- Dark Grey Blue #29465B ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.072
Use #1C3A77 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.