#1B3058
Closest named color: Prussian Blue (#1D3557). oklch(31.5% 0.077 262), rgb(27, 48, 88).
Aa
White text reads best on this color (13.04:1).
About this color
#1B3058 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.077 and its hue 262°. 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 13.04:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.61:1 |
| White text | 13.04:1 |
Values
| HEX | #1B3058 |
| RGB | rgb(27, 48, 88) |
| HSL | hsl(219, 53%, 23%) |
| OKLCH | oklch(31.5% 0.077 262) |
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 #1B3058 | 13.04:1 | AAA | Lc -102.4 | Preferred for body text |
| Black text on #1B3058 | 1.61:1 | Fails | Lc 0.0 | Not readable |
| #1B3058 text on white | 13.04:1 | AAA | Lc 99.1 | Preferred for body text |
| #1B3058 text on black | 1.61:1 | 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 950.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFB
oklch(88.5% 0.05 261.5)
-
Step 300
300
#A1C1FC
oklch(80.9% 0.091 262.4)
-
Step 400
400
#6D9FFB
oklch(70.8% 0.146 261.8)
-
Step 500
500
#4783F8
oklch(63.1% 0.186 262.1)
-
Step 600
600
#2A69E7
oklch(55.6% 0.202 262.1)
-
Step 700
700
#1D56C9
oklch(49% 0.189 262.2)
-
Step 800
800
#1A48A2
oklch(42.8% 0.154 261.9)
-
Step 900
900
#1B3D81
oklch(37.7% 0.122 262.3)
-
Step 950
950 (this color)
#1B3058
oklch(31.5% 0.077 262)
#1B3058 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) | #1E345A | 0.014 |
| Deuteranopia (no green cones) | #142E57 | 0.011 |
| Tritanopia (no blue cones) | #00393F | 0.064 |
| Achromatopsia (no color) | #313131 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3058
#1B3058
oklch(31.5% 0.077 262)
- #422D00
#422D00
oklch(31.4% 0.065 80.7)
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 #1B3058, 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 #042E60 ΔE 0.025
- Marine Blue #01386A ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.046
- Gunmetal #293241 ΔE 0.047
- Midnight Green #073B4C ΔE 0.048
- Oxford Blue #1B263B ΔE 0.057
Use #1B3058 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.