#1B335F
Closest named color: Prussian Blue (#1D3557). oklch(32.7% 0.084 261.4), rgb(27, 51, 95).
Aa
White text reads best on this color (12.46:1).
About this color
#1B335F is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.084 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.017 away. White text reads best on it, at 12.46:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.68:1 |
| White text | 12.46:1 |
Values
| HEX | #1B335F |
| RGB | rgb(27, 51, 95) |
| HSL | hsl(219, 56%, 24%) |
| OKLCH | oklch(32.7% 0.084 261.4) |
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 #1B335F | 12.46:1 | AAA | Lc -101.6 | Preferred for body text |
| Black text on #1B335F | 1.68:1 | Fails | Lc 0.0 | Not readable |
| #1B335F text on white | 12.46:1 | AAA | Lc 98.1 | Preferred for body text |
| #1B335F text on black | 1.68:1 | 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
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#AAC2EA
oklch(81% 0.063 260.6)
-
Step 400
400
#7DA1E0
oklch(70.7% 0.101 261.2)
-
Step 500
500
#5C88D7
oklch(63.1% 0.129 261.4)
-
Step 600
600
#4370C4
oklch(55.5% 0.14 261.7)
-
Step 700
700
#355EA9
oklch(49.2% 0.129 261.4)
-
Step 800
800
#2C4D89
oklch(42.7% 0.107 261.3)
-
Step 900
900 (this color)
#1B335F
oklch(32.7% 0.084 261.4)
-
Step 950
950
#172640
oklch(27% 0.053 260.8)
#1B335F 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) | #1E3761 | 0.013 |
| Deuteranopia (no green cones) | #13315E | 0.011 |
| Tritanopia (no blue cones) | #003D44 | 0.068 |
| Achromatopsia (no color) | #343434 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B335F
#1B335F
oklch(32.7% 0.084 261.4)
- #463000
#463000
oklch(32.6% 0.067 80.8)
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 #1B335F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.017
- Marine Blue #01386A ΔE 0.026
- Marine #042E60 ΔE 0.027
- Dark Blue Grey #1F3B4D ΔE 0.046
- Midnight Green #073B4C ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.054
- Gunmetal #293241 ΔE 0.055
- Twilight Blue #0A437A ΔE 0.061
Use #1B335F 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.