#1D3984
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.131 265.1), rgb(29, 57, 132).
Aa
White text reads best on this color (10.65:1).
About this color
#1D3984 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.131 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.65:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.65:1 |
Values
| HEX | #1D3984 |
| RGB | rgb(29, 57, 132) |
| HSL | hsl(224, 64%, 32%) |
| OKLCH | oklch(37.1% 0.131 265.1) |
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 #1D3984 | 10.65:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #1D3984 | 1.97:1 | Fails | Lc 9.7 | Not readable |
| #1D3984 text on white | 10.65:1 | AAA | Lc 94.3 | Preferred for body text |
| #1D3984 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C8D9FE
oklch(88.5% 0.054 265.8)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#729CFF
oklch(70.6% 0.153 265.4)
-
Step 500
500
#4D7FFF
oklch(63% 0.198 265.1)
-
Step 600
600
#3264F0
oklch(55.6% 0.218 265)
-
Step 700
700
#2651D1
oklch(49% 0.203 265.1)
-
Step 800
800
#2044A9
oklch(42.8% 0.168 265)
-
Step 900
900 (this color)
#1D3984
oklch(37.1% 0.131 265.1)
-
Step 950
950
#12234E
oklch(26.9% 0.082 265.1)
#1D3984 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) | #004387 | 0.029 |
| Deuteranopia (no green cones) | #003A83 | 0.018 |
| Tritanopia (no blue cones) | #004B58 | 0.103 |
| Achromatopsia (no color) | #3E3E3E | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3984
#1D3984
oklch(37.1% 0.131 265.1)
- #523C00
#523C00
oklch(37.1% 0.076 85.3)
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 #1D3984, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Cobalt #1E488F ΔE 0.044
- Marine Blue #01386A ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.064
- Sapphire #2138AB ΔE 0.065
- Light Navy #155084 ΔE 0.065
- Blueberry #464196 ΔE 0.069
- Marine #042E60 ΔE 0.074
Use #1D3984 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.