#2B3178
Closest named color: Marine Blue (#01386A). oklch(35.2% 0.12 274.8), rgb(43, 49, 120).
Aa
White text reads best on this color (11.58:1).
About this color
#2B3178 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.120 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.048 away. White text reads best on it, at 11.58:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.81:1 |
| White text | 11.58:1 |
Values
| HEX | #2B3178 |
| RGB | rgb(43, 49, 120) |
| HSL | hsl(235, 47%, 32%) |
| OKLCH | oklch(35.2% 0.12 274.8) |
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 #2B3178 | 11.58:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #2B3178 | 1.81:1 | Fails | Lc 7.6 | Not readable |
| #2B3178 text on white | 11.58:1 | AAA | Lc 96.3 | Preferred for body text |
| #2B3178 text on black | 1.81:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#AFBDFB
oklch(81% 0.089 274.4)
-
Step 400
400
#8798F9
oklch(70.8% 0.143 274.7)
-
Step 500
500
#6C7AF6
oklch(63.1% 0.184 275)
-
Step 600
600
#565FE5
oklch(55.6% 0.2 274.9)
-
Step 700
700
#474EC7
oklch(49.2% 0.185 274.8)
-
Step 800
800
#3A41A1
oklch(42.8% 0.153 274.7)
-
Step 900
900 (this color)
#2B3178
oklch(35.2% 0.12 274.8)
-
Step 950
950
#1C214B
oklch(26.9% 0.077 274.9)
#2B3178 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) | #003C7A | 0.042 |
| Deuteranopia (no green cones) | #003677 | 0.038 |
| Tritanopia (no blue cones) | #00424F | 0.102 |
| Achromatopsia (no color) | #393939 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3178
#2B3178
oklch(35.2% 0.12 274.8)
- #473A00
#473A00
oklch(35.2% 0.072 94.8)
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 #2B3178, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.048
- Twilight Blue #0A437A ΔE 0.053
- Marine #042E60 ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.067
- Midnight Blue #191970 ΔE 0.069
- Cobalt #1E488F ΔE 0.070
- Blueberry #464196 ΔE 0.079
Use #2B3178 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.