#1B2C52
Closest named color: Prussian Blue (#1D3557). oklch(30% 0.073 264.3), rgb(27, 44, 82).
Aa
White text reads best on this color (13.73:1).
About this color
#1B2C52 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.073 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.029 away. White text reads best on it, at 13.73:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.52:1 |
| White text | 13.73:1 |
Values
| HEX | #1B2C52 |
| RGB | rgb(27, 44, 82) |
| HSL | hsl(221, 50%, 21%) |
| OKLCH | oklch(30% 0.073 264.3) |
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 #1B2C52 | 13.73:1 | AAA | Lc -103.3 | Preferred for body text |
| Black text on #1B2C52 | 1.52:1 | Fails | Lc 0.0 | Not readable |
| #1B2C52 text on white | 13.73:1 | AAA | Lc 100.1 | Preferred for body text |
| #1B2C52 text on black | 1.52:1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#C9D9FA
oklch(88.4% 0.049 264.9)
-
Step 300
300
#A5C0F9
oklch(80.8% 0.086 264.8)
-
Step 400
400
#759EF6
oklch(70.7% 0.137 264.3)
-
Step 500
500
#5283F2
oklch(63.2% 0.175 264.1)
-
Step 600
600
#3869E1
oklch(55.6% 0.191 264.3)
-
Step 700
700
#2B56C4
oklch(49% 0.179 264.5)
-
Step 800
800
#24479E
oklch(42.6% 0.148 264.4)
-
Step 900
900
#223D7E
oklch(37.8% 0.115 264.5)
-
Step 950
950 (this color)
#1B2C52
oklch(30% 0.073 264.3)
#1B2C52 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) | #1B3053 | 0.013 |
| Deuteranopia (no green cones) | #132B51 | 0.011 |
| Tritanopia (no blue cones) | #00353B | 0.062 |
| Achromatopsia (no color) | #2D2D2D | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2C52
#1B2C52
oklch(30% 0.073 264.3)
- #3C2B00
#3C2B00
oklch(30.1% 0.062 85.2)
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 #1B2C52, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.029
- Marine #042E60 ΔE 0.030
- Space Cadet #2B2D42 ΔE 0.038
- Oxford Blue #1B263B ΔE 0.043
- Gunmetal #293241 ΔE 0.046
- Marine Blue #01386A ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.053
- Midnight Green #073B4C ΔE 0.054
Use #1B2C52 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.