#1D3E78
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.107 260.8), rgb(29, 62, 120).
Aa
White text reads best on this color (10.43:1).
About this color
#1D3E78 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.107 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.017 away. White text reads best on it, at 10.43:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.43:1 |
Values
| HEX | #1D3E78 |
| RGB | rgb(29, 62, 120) |
| HSL | hsl(218, 61%, 29%) |
| OKLCH | oklch(37.3% 0.107 260.8) |
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 #1D3E78 | 10.43:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #1D3E78 | 2.01:1 | Fails | Lc 10.0 | Not readable |
| #1D3E78 text on white | 10.43:1 | AAA | Lc 93.9 | Preferred for body text |
| #1D3E78 text on black | 2.01:1 | 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
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF7
oklch(88.5% 0.044 261.2)
-
Step 300
300
#A3C2F5
oklch(80.9% 0.08 260.3)
-
Step 400
400
#72A0F0
oklch(70.7% 0.128 260.9)
-
Step 500
500
#4D86EB
oklch(63.1% 0.164 260.9)
-
Step 600
600
#306DD9
oklch(55.5% 0.178 260.8)
-
Step 700
700
#235BBC
oklch(49.2% 0.164 260.6)
-
Step 800
800
#1E4B98
oklch(42.8% 0.136 260.4)
-
Step 900
900 (this color)
#1D3E78
oklch(37.3% 0.107 260.8)
-
Step 950
950
#122547
oklch(26.9% 0.068 261.1)
#1D3E78 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) | #20447A | 0.018 |
| Deuteranopia (no green cones) | #0A3C77 | 0.016 |
| Tritanopia (no blue cones) | #004C55 | 0.085 |
| Achromatopsia (no color) | #404040 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3E78
#1D3E78
oklch(37.3% 0.107 260.8)
- #553B00
#553B00
oklch(37.2% 0.077 80.7)
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 #1D3E78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.017
- Marine Blue #01386A ΔE 0.037
- Cobalt #1E488F ΔE 0.046
- Light Navy #155084 ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.062
- Deep Sea Blue #015482 ΔE 0.064
- Marine #042E60 ΔE 0.067
Use #1D3E78 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.