#1D3A6D
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.095 260.8), rgb(29, 58, 109).
Aa
White text reads best on this color (11.18:1).
About this color
#1D3A6D is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.095 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.022 away. White text reads best on it, at 11.18:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.87:1 |
| White text | 11.18:1 |
Values
| HEX | #1D3A6D |
| RGB | rgb(29, 58, 109) |
| HSL | hsl(218, 58%, 27%) |
| OKLCH | oklch(35.5% 0.095 260.8) |
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 #1D3A6D | 11.18:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #1D3A6D | 1.87:1 | Fails | Lc 8.3 | Not readable |
| #1D3A6D text on white | 11.18:1 | AAA | Lc 95.6 | Preferred for body text |
| #1D3A6D text on black | 1.87:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CBDAF4
oklch(88.5% 0.039 261.5)
-
Step 300
300
#A7C2EF
oklch(81% 0.07 260.6)
-
Step 400
400
#77A1E8
oklch(70.8% 0.114 260.5)
-
Step 500
500
#5487E1
oklch(63% 0.147 261)
-
Step 600
600
#396FCF
oklch(55.6% 0.159 260.9)
-
Step 700
700
#2B5CB3
oklch(49% 0.148 260.9)
-
Step 800
800
#254C91
oklch(42.7% 0.122 260.8)
-
Step 900
900 (this color)
#1D3A6D
oklch(35.5% 0.095 260.8)
-
Step 950
950
#152644
oklch(27.1% 0.061 261)
#1D3A6D 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) | #213F6F | 0.016 |
| Deuteranopia (no green cones) | #12386C | 0.013 |
| Tritanopia (no blue cones) | #00464E | 0.076 |
| Achromatopsia (no color) | #3B3B3B | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3A6D
#1D3A6D
oklch(35.5% 0.095 260.8)
- #4F3700
#4F3700
oklch(35.5% 0.073 81.3)
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 #1D3A6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.022
- Twilight Blue #0A437A ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.039
- Marine #042E60 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.057
- Dark Blue Grey #1F3B4D ΔE 0.058
- Midnight Green #073B4C ΔE 0.064
- Cobalt #1E488F ΔE 0.067
Use #1D3A6D 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.