#1B396E
Closest named color: Marine Blue (#01386A). oklch(35.3% 0.099 260.8), rgb(27, 57, 110).
Aa
White text reads best on this color (11.30:1).
About this color
#1B396E is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.099 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.020 away. White text reads best on it, at 11.30:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.85:1 |
| White text | 11.30:1 |
Values
| HEX | #1B396E |
| RGB | rgb(27, 57, 110) |
| HSL | hsl(218, 61%, 27%) |
| OKLCH | oklch(35.3% 0.099 260.8) |
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 #1B396E | 11.30:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #1B396E | 1.85:1 | Fails | Lc 8.1 | Not readable |
| #1B396E text on white | 11.30:1 | AAA | Lc 95.8 | Preferred for body text |
| #1B396E text on black | 1.85:1 | 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
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A6C2F1
oklch(81% 0.073 260.7)
-
Step 400
400
#76A1EA
oklch(70.8% 0.117 260.6)
-
Step 500
500
#5287E4
oklch(63.1% 0.151 260.8)
-
Step 600
600
#366FD2
oklch(55.7% 0.164 260.6)
-
Step 700
700
#295CB6
oklch(49.1% 0.153 260.8)
-
Step 800
800
#234C93
oklch(42.8% 0.126 260.6)
-
Step 900
900 (this color)
#1B396E
oklch(35.3% 0.099 260.8)
-
Step 950
950
#142645
oklch(27.1% 0.063 260.6)
#1B396E 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) | #1E3E70 | 0.016 |
| Deuteranopia (no green cones) | #0C376D | 0.014 |
| Tritanopia (no blue cones) | #00454E | 0.077 |
| Achromatopsia (no color) | #3A3A3A | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B396E
#1B396E
oklch(35.3% 0.099 260.8)
- #4F3600
#4F3600
oklch(35.3% 0.073 79.9)
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 #1B396E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.020
- Twilight Blue #0A437A ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.040
- Marine #042E60 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.061
- Midnight Green #073B4C ΔE 0.065
- Cobalt #1E488F ΔE 0.067
Use #1B396E 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.