#1D3C69
Closest named color: Marine Blue (#01386A). oklch(35.7% 0.087 257.8), rgb(29, 60, 105).
Aa
White text reads best on this color (11.03:1).
About this color
#1D3C69 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.087 and its hue 258°. 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 11.03:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.90:1 |
| White text | 11.03:1 |
Values
| HEX | #1D3C69 |
| RGB | rgb(29, 60, 105) |
| HSL | hsl(216, 57%, 26%) |
| OKLCH | oklch(35.7% 0.087 257.8) |
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 #1D3C69 | 11.03:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #1D3C69 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #1D3C69 text on white | 11.03:1 | AAA | Lc 95.3 | Preferred for body text |
| #1D3C69 text on black | 1.90:1 | Fails | Lc -7.4 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A7C3EB
oklch(81% 0.064 257.3)
-
Step 400
400
#77A2E1
oklch(70.6% 0.104 257.8)
-
Step 500
500
#548AD9
oklch(63.2% 0.133 257.9)
-
Step 600
600
#3872C6
oklch(55.6% 0.144 257.9)
-
Step 700
700
#2A5FAB
oklch(49.1% 0.134 257.9)
-
Step 800
800
#244E8B
oklch(42.7% 0.112 258)
-
Step 900
900 (this color)
#1D3C69
oklch(35.7% 0.087 257.8)
-
Step 950
950
#152741
oklch(27.2% 0.054 257.6)
#1D3C69 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) | #27406B | 0.018 |
| Deuteranopia (no green cones) | #1B3968 | 0.010 |
| Tritanopia (no blue cones) | #00464D | 0.068 |
| Achromatopsia (no color) | #3C3C3C | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3C69
#1D3C69
oklch(35.7% 0.087 257.8)
- #523700
#523700
oklch(35.9% 0.075 78.1)
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 #1D3C69, 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 0.033
- Prussian Blue #1D3557 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.049
- Marine #042E60 ΔE 0.052
- Midnight Green #073B4C ΔE 0.056
- Charcoal #264653 ΔE 0.057
Use #1D3C69 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.