#1B3053
Closest named color: Prussian Blue (#1D3557). oklch(31.1% 0.069 260.1), rgb(27, 48, 83).
Aa
White text reads best on this color (13.17:1).
About this color
#1B3053 is a dark, muted blue. In OKLCH its lightness is 31%, its chroma 0.069 and its hue 260°. 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 13.17:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.59:1 |
| White text | 13.17:1 |
Values
| HEX | #1B3053 |
| RGB | rgb(27, 48, 83) |
| HSL | hsl(218, 51%, 22%) |
| OKLCH | oklch(31.1% 0.069 260.1) |
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 #1B3053 | 13.17:1 | AAA | Lc -102.6 | Preferred for body text |
| Black text on #1B3053 | 1.59:1 | Fails | Lc 0.0 | Not readable |
| #1B3053 text on white | 13.17:1 | AAA | Lc 99.3 | Preferred for body text |
| #1B3053 text on black | 1.59:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A2C2F6
oklch(80.9% 0.082 260)
-
Step 400
400
#70A0F1
oklch(70.6% 0.13 260.4)
-
Step 500
500
#4986EC
oklch(63% 0.166 260.1)
-
Step 600
600
#2B6DDB
oklch(55.5% 0.182 260.2)
-
Step 700
700
#1E5BBE
oklch(49.2% 0.168 260)
-
Step 800
800
#1B4B9A
oklch(42.8% 0.139 260)
-
Step 900
900
#1C3F7A
oklch(37.7% 0.109 260.2)
-
Step 950
950 (this color)
#1B3053
oklch(31.1% 0.069 260.1)
#1B3053 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) | #213354 | 0.013 |
| Deuteranopia (no green cones) | #192E52 | 0.007 |
| Tritanopia (no blue cones) | #00383D | 0.058 |
| Achromatopsia (no color) | #303030 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3053
#1B3053
oklch(31.1% 0.069 260.1)
- #412C00
#412C00
oklch(31% 0.064 80.3)
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 #1B3053, 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 0.031
- Space Cadet #2B2D42 ΔE 0.036
- Gunmetal #293241 ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.041
- Midnight Green #073B4C ΔE 0.043
- Marine Blue #01386A ΔE 0.045
- Oxford Blue #1B263B ΔE 0.050
Use #1B3053 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.