#1D3D71
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.097 259.7), rgb(29, 61, 113).
Aa
White text reads best on this color (10.72:1).
About this color
#1D3D71 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.097 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.72:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.72:1 |
Values
| HEX | #1D3D71 |
| RGB | rgb(29, 61, 113) |
| HSL | hsl(217, 59%, 28%) |
| OKLCH | oklch(36.6% 0.097 259.7) |
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 #1D3D71 | 10.72:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #1D3D71 | 1.95:1 | Fails | Lc 9.3 | Not readable |
| #1D3D71 text on white | 10.72:1 | AAA | Lc 94.6 | Preferred for body text |
| #1D3D71 text on black | 1.95:1 | Fails | Lc -8.0 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A5C2F0
oklch(80.9% 0.073 259.5)
-
Step 400
400
#74A1E9
oklch(70.6% 0.117 259.5)
-
Step 500
500
#5088E3
oklch(63.2% 0.15 259.6)
-
Step 600
600
#3470D0
oklch(55.7% 0.161 259.5)
-
Step 700
700
#265DB5
oklch(49.2% 0.151 259.6)
-
Step 800
800
#214C92
oklch(42.6% 0.125 259.7)
-
Step 900
900 (this color)
#1D3D71
oklch(36.6% 0.097 259.7)
-
Step 950
950
#132644
oklch(27% 0.061 259.2)
#1D3D71 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) | #234273 | 0.017 |
| Deuteranopia (no green cones) | #143A70 | 0.013 |
| Tritanopia (no blue cones) | #004951 | 0.077 |
| Achromatopsia (no color) | #3E3E3E | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3D71
#1D3D71
oklch(36.6% 0.097 259.7)
- #533900
#533900
oklch(36.5% 0.076 80)
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 #1D3D71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.054
- Cobalt #1E488F ΔE 0.057
- Marine #042E60 ΔE 0.059
- Light Navy #155084 ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.063
Use #1D3D71 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.