#1B3756
Closest named color: Prussian Blue (#1D3557). oklch(33.1% 0.065 252.5), rgb(27, 55, 86).
Aa
White text reads best on this color (12.15:1).
About this color
#1B3756 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.065 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.007 away. White text reads best on it, at 12.15:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.72:1 |
| White text | 12.15:1 |
Values
| HEX | #1B3756 |
| RGB | rgb(27, 55, 86) |
| HSL | hsl(212, 52%, 22%) |
| OKLCH | oklch(33.1% 0.065 252.5) |
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 #1B3756 | 12.15:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #1B3756 | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #1B3756 text on white | 12.15:1 | AAA | Lc 97.6 | Preferred for body text |
| #1B3756 text on black | 1.72:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CDDBEB
oklch(88.6% 0.027 251.7)
-
Step 300
300
#ABC3E0
oklch(80.9% 0.049 253.3)
-
Step 400
400
#7DA4D0
oklch(70.7% 0.078 251.9)
-
Step 500
500
#5C8DC4
oklch(63.2% 0.099 252.2)
-
Step 600
600
#4176B1
oklch(55.6% 0.108 252.6)
-
Step 700
700
#336398
oklch(49.2% 0.1 252.5)
-
Step 800
800
#2B517B
oklch(42.7% 0.083 252.4)
-
Step 900
900 (this color)
#1B3756
oklch(33.1% 0.065 252.5)
-
Step 950
950
#17283A
oklch(27.1% 0.041 250.8)
#1B3756 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) | #2A3957 | 0.021 |
| Deuteranopia (no green cones) | #223355 | 0.014 |
| Tritanopia (no blue cones) | #003E42 | 0.052 |
| Achromatopsia (no color) | #363636 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3756
#1B3756
oklch(33.1% 0.065 252.5)
- #4A2F07
#4A2F07
oklch(33% 0.065 71.4)
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 #1B3756, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.007
- Dark Blue Grey #1F3B4D ΔE 0.024
- Midnight Green #073B4C ΔE 0.029
- Marine Blue #01386A ΔE 0.038
- Gunmetal #293241 ΔE 0.039
- Marine #042E60 ΔE 0.042
- Space Cadet #2B2D42 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.053
Use #1B3756 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.