#1D3E84
Closest named color: Twilight Blue (#0A437A). oklch(38.2% 0.124 262.9), rgb(29, 62, 132).
Aa
White text reads best on this color (10.12:1).
About this color
#1D3E84 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.124 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 10.12:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.07:1 |
| White text | 10.12:1 |
Values
| HEX | #1D3E84 |
| RGB | rgb(29, 62, 132) |
| HSL | hsl(221, 64%, 32%) |
| OKLCH | oklch(38.2% 0.124 262.9) |
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 #1D3E84 | 10.12:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #1D3E84 | 2.07:1 | Fails | Lc 10.8 | Not readable |
| #1D3E84 text on white | 10.12:1 | AAA | Lc 93.1 | Preferred for body text |
| #1D3E84 text on black | 2.07:1 | Fails | Lc -9.4 | 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
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFC
oklch(88.5% 0.051 262.1)
-
Step 300
300
#A1C1FD
oklch(80.9% 0.092 262.7)
-
Step 400
400
#6E9EFD
oklch(70.7% 0.149 262.9)
-
Step 500
500
#4882FB
oklch(63.1% 0.191 262.9)
-
Step 600
600
#2C68EA
oklch(55.7% 0.207 262.9)
-
Step 700
700
#1F55CB
oklch(49% 0.192 262.9)
-
Step 800
800
#1B46A4
oklch(42.6% 0.159 262.9)
-
Step 900
900 (this color)
#1D3E84
oklch(38.2% 0.124 262.9)
-
Step 950
950
#11244C
oklch(27% 0.078 263.1)
#1D3E84 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) | #104787 | 0.025 |
| Deuteranopia (no green cones) | #003D83 | 0.019 |
| Tritanopia (no blue cones) | #004F5B | 0.097 |
| Achromatopsia (no color) | #424242 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3E84
#1D3E84
oklch(38.2% 0.124 262.9)
- #573E00
#573E00
oklch(38.2% 0.079 82.8)
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 #1D3E84, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.026
- Cobalt #1E488F ΔE 0.032
- Light Navy #155084 ΔE 0.052
- Marine Blue #01386A ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.059
- Dusk Blue #26538D ΔE 0.063
- Blueberry #464196 ΔE 0.063
- Deep Sea Blue #015482 ΔE 0.064
Use #1D3E84 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.