#2B3166
Closest named color: Prussian Blue (#1D3557). oklch(33.8% 0.092 275.5), rgb(43, 49, 102).
Aa
White text reads best on this color (12.11:1).
About this color
#2B3166 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.092 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.036 away. White text reads best on it, at 12.11:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.73:1 |
| White text | 12.11:1 |
Values
| HEX | #2B3166 |
| RGB | rgb(43, 49, 102) |
| HSL | hsl(234, 41%, 28%) |
| OKLCH | oklch(33.8% 0.092 275.5) |
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 #2B3166 | 12.11:1 | AAA | Lc -101.0 | Preferred for body text |
| Black text on #2B3166 | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #2B3166 text on white | 12.11:1 | AAA | Lc 97.5 | Preferred for body text |
| #2B3166 text on black | 1.73:1 | 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
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D8F3
oklch(88.5% 0.038 274.1)
-
Step 300
300
#B3BEEE
oklch(80.9% 0.069 274.7)
-
Step 400
400
#8D9AE5
oklch(70.6% 0.111 275.7)
-
Step 500
500
#7280DE
oklch(63.1% 0.141 275.2)
-
Step 600
600
#5C67CB
oklch(55.6% 0.153 275.5)
-
Step 700
700
#4C55B0
oklch(49.1% 0.143 275.5)
-
Step 800
800
#3E468E
oklch(42.6% 0.118 275.5)
-
Step 900
900 (this color)
#2B3166
oklch(33.8% 0.092 275.5)
-
Step 950
950
#1F2343
oklch(27% 0.059 276.3)
#2B3166 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) | #173868 | 0.029 |
| Deuteranopia (no green cones) | #103465 | 0.031 |
| Tritanopia (no blue cones) | #0E3D46 | 0.082 |
| Achromatopsia (no color) | #363636 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3166
#2B3166
oklch(33.8% 0.092 275.5)
- #423700
#423700
oklch(33.8% 0.07 96.6)
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 #2B3166, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.036
- Marine Blue #01386A ΔE 0.040
- Marine #042E60 ΔE 0.045
- Twilight Blue #0A437A ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.062
- Space Cadet #2B2D42 ΔE 0.064
- Gunmetal #293241 ΔE 0.068
- Midnight Green #073B4C ΔE 0.071
Use #2B3166 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.