#1D3B7E
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.119 263.5), rgb(29, 59, 126).
Aa
White text reads best on this color (10.61:1).
About this color
#1D3B7E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.119 and its hue 264°. 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 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #1D3B7E |
| RGB | rgb(29, 59, 126) |
| HSL | hsl(221, 63%, 30%) |
| OKLCH | oklch(37.1% 0.119 263.5) |
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 #1D3B7E | 10.61:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #1D3B7E | 1.97:1 | Fails | Lc 9.7 | Not readable |
| #1D3B7E text on white | 10.61:1 | AAA | Lc 94.2 | Preferred for body text |
| #1D3B7E text on black | 1.97:1 | Fails | Lc -8.3 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C8DAFB
oklch(88.5% 0.05 262.6)
-
Step 300
300
#A3C1FB
oklch(81% 0.089 263.3)
-
Step 400
400
#719EF9
oklch(70.7% 0.143 263.3)
-
Step 500
500
#4D82F7
oklch(63.1% 0.184 263.7)
-
Step 600
600
#3268E5
oklch(55.5% 0.199 263.6)
-
Step 700
700
#2556C7
oklch(49.1% 0.184 263.4)
-
Step 800
800
#2047A1
oklch(42.7% 0.153 263.6)
-
Step 900
900 (this color)
#1D3B7E
oklch(37.1% 0.119 263.5)
-
Step 950
950
#12244B
oklch(26.9% 0.076 263.5)
#1D3B7E 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) | #104380 | 0.023 |
| Deuteranopia (no green cones) | #003A7D | 0.020 |
| Tritanopia (no blue cones) | #004B56 | 0.095 |
| Achromatopsia (no color) | #3F3F3F | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3B7E
#1D3B7E
oklch(37.1% 0.119 263.5)
- #533C00
#533C00
oklch(37.2% 0.076 84.2)
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 #1D3B7E, 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 0.042
- Cobalt #1E488F ΔE 0.044
- Light Navy #155084 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.068
- Marine #042E60 ΔE 0.068
- Deep Sea Blue #015482 ΔE 0.072
Use #1D3B7E 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.