#1B3752
Closest named color: Prussian Blue (#1D3557). oklch(32.9% 0.059 249.3), rgb(27, 55, 82).
Aa
White text reads best on this color (12.24:1).
About this color
#1B3752 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.059 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.012 away. White text reads best on it, at 12.24:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.71:1 |
| White text | 12.24:1 |
Values
| HEX | #1B3752 |
| RGB | rgb(27, 55, 82) |
| HSL | hsl(209, 50%, 21%) |
| OKLCH | oklch(32.9% 0.059 249.3) |
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 #1B3752 | 12.24:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #1B3752 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #1B3752 text on white | 12.24:1 | AAA | Lc 97.8 | Preferred for body text |
| #1B3752 text on black | 1.71:1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CDDBE9
oklch(88.5% 0.025 248.1)
-
Step 300
300
#ABC4DD
oklch(81% 0.045 248.4)
-
Step 400
400
#7EA5CB
oklch(70.7% 0.07 248.2)
-
Step 500
500
#5D8EBE
oklch(63.2% 0.09 248.9)
-
Step 600
600
#4277AA
oklch(55.5% 0.098 249.2)
-
Step 700
700
#346492
oklch(49.1% 0.091 249.3)
-
Step 800
800
#2B5277
oklch(42.8% 0.076 248.9)
-
Step 900
900 (this color)
#1B3752
oklch(32.9% 0.059 249.3)
-
Step 950
950
#182838
oklch(27.1% 0.037 249.3)
#1B3752 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) | #2B3853 | 0.021 |
| Deuteranopia (no green cones) | #243351 | 0.015 |
| Tritanopia (no blue cones) | #003D41 | 0.046 |
| Achromatopsia (no color) | #353535 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3752
#1B3752
oklch(32.9% 0.059 249.3)
- #482F0F
#482F0F
oklch(32.8% 0.058 69.6)
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 #1B3752, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.012
- Dark Blue Grey #1F3B4D ΔE 0.019
- Midnight Green #073B4C ΔE 0.024
- Gunmetal #293241 ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.040
- Marine Blue #01386A ΔE 0.044
- Marine #042E60 ΔE 0.047
- Onyx #343A40 ΔE 0.049
Use #1B3752 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.