#2B3474
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.109 273.5), rgb(43, 52, 116).
Aa
White text reads best on this color (11.37:1).
About this color
#2B3474 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.109 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.043 away. White text reads best on it, at 11.37:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.84:1 |
| White text | 11.37:1 |
Values
| HEX | #2B3474 |
| RGB | rgb(43, 52, 116) |
| HSL | hsl(233, 46%, 31%) |
| OKLCH | oklch(35.5% 0.109 273.5) |
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 #2B3474 | 11.37:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #2B3474 | 1.84:1 | Fails | Lc 7.9 | Not readable |
| #2B3474 text on white | 11.37:1 | AAA | Lc 96.0 | Preferred for body text |
| #2B3474 text on black | 1.84:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CFD8F8
oklch(88.5% 0.045 273)
-
Step 300
300
#AFBDF6
oklch(80.8% 0.082 273.7)
-
Step 400
400
#8799F2
oklch(70.6% 0.132 273.9)
-
Step 500
500
#6B7DED
oklch(63% 0.168 273.7)
-
Step 600
600
#5464DC
oklch(55.7% 0.182 273.2)
-
Step 700
700
#4552BF
oklch(49.2% 0.17 273.3)
-
Step 800
800
#39449A
oklch(42.8% 0.14 273.5)
-
Step 900
900 (this color)
#2B3474
oklch(35.5% 0.109 273.5)
-
Step 950
950
#1C2348
oklch(27.1% 0.069 272.9)
#2B3474 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) | #0D3D76 | 0.035 |
| Deuteranopia (no green cones) | #003773 | 0.037 |
| Tritanopia (no blue cones) | #00434E | 0.096 |
| Achromatopsia (no color) | #3A3A3A | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3474
#2B3474
oklch(35.5% 0.109 273.5)
- #493A00
#493A00
oklch(35.4% 0.073 92.5)
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 #2B3474, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.043
- Twilight Blue #0A437A ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.056
- Marine #042E60 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.066
- Cobalt #1E488F ΔE 0.067
- Midnight Blue #191970 ΔE 0.075
- Dark Grey Blue #29465B ΔE 0.077
Use #2B3474 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.