#1D3B77
Closest named color: Twilight Blue (#0A437A). oklch(36.5% 0.109 262.4), rgb(29, 59, 119).
Aa
White text reads best on this color (10.80:1).
About this color
#1D3B77 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.109 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.024 away. White text reads best on it, at 10.80:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #1D3B77 |
| RGB | rgb(29, 59, 119) |
| HSL | hsl(220, 61%, 29%) |
| OKLCH | oklch(36.5% 0.109 262.4) |
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 #1D3B77 | 10.80:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #1D3B77 | 1.94:1 | Fails | Lc 9.2 | Not readable |
| #1D3B77 text on white | 10.80:1 | AAA | Lc 94.7 | Preferred for body text |
| #1D3B77 text on black | 1.94:1 | Fails | Lc -7.9 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A4C1F6
oklch(80.8% 0.082 262.3)
-
Step 400
400
#749FF2
oklch(70.7% 0.131 262.7)
-
Step 500
500
#5085ED
oklch(63.2% 0.166 262.3)
-
Step 600
600
#346CDC
oklch(55.7% 0.182 262.2)
-
Step 700
700
#2759BF
oklch(49.1% 0.169 262.4)
-
Step 800
800
#21499A
oklch(42.6% 0.14 262.4)
-
Step 900
900 (this color)
#1D3B77
oklch(36.5% 0.109 262.4)
-
Step 950
950
#132548
oklch(27% 0.069 262.3)
#1D3B77 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) | #1A4279 | 0.020 |
| Deuteranopia (no green cones) | #003976 | 0.021 |
| Tritanopia (no blue cones) | #004953 | 0.086 |
| Achromatopsia (no color) | #3D3D3D | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3B77
#1D3B77
oklch(36.5% 0.109 262.4)
- #523A00
#523A00
oklch(36.6% 0.075 82.4)
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 #1D3B77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.024
- Marine Blue #01386A ΔE 0.033
- Cobalt #1E488F ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.056
- Marine #042E60 ΔE 0.060
- Light Navy #155084 ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.067
- Dark Slate Blue #483D8B ΔE 0.070
Use #1D3B77 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.