#1D3772
Closest named color: Marine Blue (#01386A). oklch(35.2% 0.107 263.9), rgb(29, 55, 114).
Aa
White text reads best on this color (11.40:1).
About this color
#1D3772 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.107 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.025 away. White text reads best on it, at 11.40:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.84:1 |
| White text | 11.40:1 |
Values
| HEX | #1D3772 |
| RGB | rgb(29, 55, 114) |
| HSL | hsl(222, 59%, 28%) |
| OKLCH | oklch(35.2% 0.107 263.9) |
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 #1D3772 | 11.40:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #1D3772 | 1.84:1 | Fails | Lc 7.9 | Not readable |
| #1D3772 text on white | 11.40:1 | AAA | Lc 96.0 | Preferred for body text |
| #1D3772 text on black | 1.84:1 | Fails | Lc 0.0 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF7
oklch(88.5% 0.044 262.4)
-
Step 300
300
#A6C1F5
oklch(80.9% 0.08 263.3)
-
Step 400
400
#779FF0
oklch(70.7% 0.127 263.5)
-
Step 500
500
#5584EB
oklch(63.1% 0.163 263.9)
-
Step 600
600
#3B6BDA
oklch(55.6% 0.178 263.9)
-
Step 700
700
#2E59BD
oklch(49.2% 0.165 263.8)
-
Step 800
800
#264999
oklch(42.7% 0.137 263.8)
-
Step 900
900 (this color)
#1D3772
oklch(35.2% 0.107 263.9)
-
Step 950
950
#152547
oklch(27.1% 0.067 263.6)
#1D3772 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) | #153E74 | 0.020 |
| Deuteranopia (no green cones) | #003671 | 0.021 |
| Tritanopia (no blue cones) | #00454F | 0.085 |
| Achromatopsia (no color) | #3A3A3A | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3772
#1D3772
oklch(35.2% 0.107 263.9)
- #4D3700
#4D3700
oklch(35.2% 0.072 83.6)
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 #1D3772, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.025
- Twilight Blue #0A437A ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.047
- Marine #042E60 ΔE 0.048
- Cobalt #1E488F ΔE 0.065
- Dark Blue Grey #1F3B4D ΔE 0.069
- Dark Grey Blue #29465B ΔE 0.070
- Midnight Green #073B4C ΔE 0.074
Use #1D3772 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.