#1B3962
Closest named color: Prussian Blue (#1D3557). oklch(34.4% 0.081 256.8), rgb(27, 57, 98).
Aa
White text reads best on this color (11.61:1).
About this color
#1B3962 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.081 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.021 away. White text reads best on it, at 11.61:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.80:1 |
| White text | 11.61:1 |
Values
| HEX | #1B3962 |
| RGB | rgb(27, 57, 98) |
| HSL | hsl(215, 57%, 25%) |
| OKLCH | oklch(34.4% 0.081 256.8) |
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 #1B3962 | 11.61:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #1B3962 | 1.80:1 | Fails | Lc 7.4 | Not readable |
| #1B3962 text on white | 11.61:1 | AAA | Lc 96.5 | Preferred for body text |
| #1B3962 text on black | 1.80:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF6
oklch(93.7% 0.017 256.3)
-
Step 200
200
#CBDAF0
oklch(88.4% 0.034 257.9)
-
Step 300
300
#A8C3E8
oklch(81% 0.06 256.3)
-
Step 400
400
#79A3DD
oklch(70.8% 0.097 256.6)
-
Step 500
500
#568BD3
oklch(63.2% 0.123 256.4)
-
Step 600
600
#3A73C0
oklch(55.5% 0.134 256.7)
-
Step 700
700
#2D60A6
oklch(49.1% 0.125 257)
-
Step 800
800
#264F86
oklch(42.7% 0.103 256.5)
-
Step 900
900 (this color)
#1B3962
oklch(34.4% 0.081 256.8)
-
Step 950
950
#15273F
oklch(27% 0.051 256.1)
#1B3962 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) | #263C64 | 0.017 |
| Deuteranopia (no green cones) | #1C3661 | 0.009 |
| Tritanopia (no blue cones) | #004248 | 0.064 |
| Achromatopsia (no color) | #393939 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3962
#1B3962
oklch(34.4% 0.081 256.8)
- #4E3300
#4E3300
oklch(34.4% 0.072 76.4)
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 #1B3962, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.021
- Marine Blue #01386A ΔE 0.023
- Dark Blue Grey #1F3B4D ΔE 0.040
- Marine #042E60 ΔE 0.042
- Midnight Green #073B4C ΔE 0.045
- Twilight Blue #0A437A ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.051
- Charcoal #264653 ΔE 0.058
Use #1B3962 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.