#1B3C6D
Closest named color: Marine Blue (#01386A). oklch(35.9% 0.093 258.3), rgb(27, 60, 109).
Aa
White text reads best on this color (10.97:1).
About this color
#1B3C6D is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.093 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.024 away. White text reads best on it, at 10.97:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.91:1 |
| White text | 10.97:1 |
Values
| HEX | #1B3C6D |
| RGB | rgb(27, 60, 109) |
| HSL | hsl(216, 60%, 27%) |
| OKLCH | oklch(35.9% 0.093 258.3) |
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 #1B3C6D | 10.97:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #1B3C6D | 1.91:1 | Fails | Lc 8.8 | Not readable |
| #1B3C6D text on white | 10.97:1 | AAA | Lc 95.1 | Preferred for body text |
| #1B3C6D text on black | 1.91:1 | Fails | Lc -7.5 | 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
#E2EBF8
oklch(93.7% 0.02 257.5)
-
Step 200
200
#CADAF3
oklch(88.4% 0.039 259.3)
-
Step 300
300
#A5C2EE
oklch(80.8% 0.07 258.6)
-
Step 400
400
#74A2E6
oklch(70.7% 0.112 258)
-
Step 500
500
#5089DF
oklch(63.2% 0.143 258.4)
-
Step 600
600
#3371CC
oklch(55.6% 0.155 258.2)
-
Step 700
700
#255EB1
oklch(49.1% 0.145 258.3)
-
Step 800
800
#204D8F
oklch(42.6% 0.12 258.3)
-
Step 900
900 (this color)
#1B3C6D
oklch(35.9% 0.093 258.3)
-
Step 950
950
#132643
oklch(26.9% 0.06 258.6)
#1B3C6D 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) | #24406F | 0.017 |
| Deuteranopia (no green cones) | #16396C | 0.011 |
| Tritanopia (no blue cones) | #00474F | 0.073 |
| Achromatopsia (no color) | #3C3C3C | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3C6D
#1B3C6D
oklch(35.9% 0.093 258.3)
- #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 #1B3C6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.024
- Twilight Blue #0A437A ΔE 0.028
- Prussian Blue #1D3557 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.052
- Marine #042E60 ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.056
- Midnight Green #073B4C ΔE 0.062
- Charcoal #264653 ΔE 0.063
Use #1B3C6D 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.