#1D3A82
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.127 264.5), rgb(29, 58, 130).
Aa
White text reads best on this color (10.60:1).
About this color
#1D3A82 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.127 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.031 away. White text reads best on it, at 10.60:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.60:1 |
Values
| HEX | #1D3A82 |
| RGB | rgb(29, 58, 130) |
| HSL | hsl(223, 64%, 31%) |
| OKLCH | oklch(37.2% 0.127 264.5) |
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 #1D3A82 | 10.60:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #1D3A82 | 1.97:1 | Fails | Lc 9.7 | Not readable |
| #1D3A82 text on white | 10.60:1 | AAA | Lc 94.2 | Preferred for body text |
| #1D3A82 text on black | 1.97:1 | Fails | Lc -8.4 | 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
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C8D9FD
oklch(88.4% 0.053 265.3)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4C80FD
oklch(63% 0.195 264.5)
-
Step 600
600
#3266EC
oklch(55.7% 0.21 264.4)
-
Step 700
700
#2553CE
oklch(49.1% 0.197 264.5)
-
Step 800
800
#2045A6
oklch(42.7% 0.162 264.5)
-
Step 900
900 (this color)
#1D3A82
oklch(37.2% 0.127 264.5)
-
Step 950
950
#12244D
oklch(27.1% 0.079 264)
#1D3A82 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) | #024385 | 0.027 |
| Deuteranopia (no green cones) | #003A81 | 0.019 |
| Tritanopia (no blue cones) | #004C58 | 0.101 |
| Achromatopsia (no color) | #3F3F3F | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3A82
#1D3A82
oklch(37.2% 0.127 264.5)
- #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 #1D3A82, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.031
- Cobalt #1E488F ΔE 0.043
- Marine Blue #01386A ΔE 0.047
- Light Navy #155084 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.063
- Sapphire #2138AB ΔE 0.068
- Blueberry #464196 ΔE 0.069
- Marine #042E60 ΔE 0.072
Use #1D3A82 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.