#2B3365
Closest named color: Prussian Blue (#1D3557). oklch(34.2% 0.087 274), rgb(43, 51, 101).
Aa
White text reads best on this color (11.90:1).
About this color
#2B3365 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.087 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.033 away. White text reads best on it, at 11.90:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.76:1 |
| White text | 11.90:1 |
Values
| HEX | #2B3365 |
| RGB | rgb(43, 51, 101) |
| HSL | hsl(232, 40%, 28%) |
| OKLCH | oklch(34.2% 0.087 274) |
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 #2B3365 | 11.90:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #2B3365 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #2B3365 text on white | 11.90:1 | AAA | Lc 97.1 | Preferred for body text |
| #2B3365 text on black | 1.76:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B3BEEC
oklch(80.9% 0.066 274.3)
-
Step 400
400
#8C9CE2
oklch(70.8% 0.104 273.6)
-
Step 500
500
#7181DA
oklch(63% 0.135 274.2)
-
Step 600
600
#5A69C7
oklch(55.6% 0.145 273.9)
-
Step 700
700
#4A57AC
oklch(49.1% 0.135 273.8)
-
Step 800
800
#3D488C
oklch(42.8% 0.112 273.8)
-
Step 900
900 (this color)
#2B3365
oklch(34.2% 0.087 274)
-
Step 950
950
#1E2441
oklch(27% 0.055 273.4)
#2B3365 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) | #1C3A67 | 0.025 |
| Deuteranopia (no green cones) | #153564 | 0.026 |
| Tritanopia (no blue cones) | #0E3E47 | 0.077 |
| Achromatopsia (no color) | #373737 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3365
#2B3365
oklch(34.2% 0.087 274)
- #443700
#443700
oklch(34.1% 0.07 94.2)
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 #2B3365, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.033
- Marine Blue #01386A ΔE 0.038
- Marine #042E60 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.057
- Twilight Blue #0A437A ΔE 0.057
- Space Cadet #2B2D42 ΔE 0.062
- Gunmetal #293241 ΔE 0.065
- Dark Grey Blue #29465B ΔE 0.066
Use #2B3365 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.