#1A3665
Closest named color: Marine Blue (#01386A). oklch(33.8% 0.089 260.1), rgb(26, 54, 101).
Aa
White text reads best on this color (11.93:1).
About this color
#1A3665 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.089 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.018 away. White text reads best on it, at 11.93:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.75:1 |
| White text | 11.93:1 |
Values
| HEX | #1A3665 |
| RGB | rgb(26, 54, 101) |
| HSL | hsl(218, 59%, 25%) |
| OKLCH | oklch(33.8% 0.089 260.1) |
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 #1A3665 | 11.93:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #1A3665 | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #1A3665 text on white | 11.93:1 | AAA | Lc 97.1 | Preferred for body text |
| #1A3665 text on black | 1.75:1 | 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
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A8C2ED
oklch(80.9% 0.067 260.4)
-
Step 400
400
#79A1E3
oklch(70.6% 0.107 260.1)
-
Step 500
500
#5688DC
oklch(63% 0.138 260.2)
-
Step 600
600
#3B70C9
oklch(55.5% 0.149 260.1)
-
Step 700
700
#2E5EAE
oklch(49.2% 0.138 260)
-
Step 800
800
#274D8D
oklch(42.8% 0.115 260.2)
-
Step 900
900 (this color)
#1A3665
oklch(33.8% 0.089 260.1)
-
Step 950
950
#152642
oklch(27% 0.057 259.9)
#1A3665 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) | #1F3B67 | 0.017 |
| Deuteranopia (no green cones) | #123464 | 0.011 |
| Tritanopia (no blue cones) | #004148 | 0.072 |
| Achromatopsia (no color) | #373737 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A3665
#1A3665
oklch(33.8% 0.089 260.1)
- #4A3300
#4A3300
oklch(33.9% 0.07 80.9)
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 #1A3665, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.018
- Prussian Blue #1D3557 ΔE 0.024
- Marine #042E60 ΔE 0.034
- Twilight Blue #0A437A ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.049
- Midnight Green #073B4C ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.062
- Gunmetal #293241 ΔE 0.064
Use #1A3665 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.