#2B3174
Closest named color: Marine Blue (#01386A). oklch(34.9% 0.114 275), rgb(43, 49, 116).
Aa
White text reads best on this color (11.70:1).
About this color
#2B3174 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.114 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.045 away. White text reads best on it, at 11.70:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.70:1 |
Values
| HEX | #2B3174 |
| RGB | rgb(43, 49, 116) |
| HSL | hsl(235, 46%, 31%) |
| OKLCH | oklch(34.9% 0.114 275) |
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 #2B3174 | 11.70:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #2B3174 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #2B3174 text on white | 11.70:1 | AAA | Lc 96.6 | Preferred for body text |
| #2B3174 text on black | 1.79:1 | 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
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#CFD7F9
oklch(88.4% 0.048 274.9)
-
Step 300
300
#B0BDF8
oklch(80.9% 0.085 274.7)
-
Step 400
400
#8898F5
oklch(70.7% 0.137 275)
-
Step 500
500
#6D7BF1
oklch(63% 0.175 275.1)
-
Step 600
600
#5761DF
oklch(55.5% 0.189 275)
-
Step 700
700
#484FC2
oklch(49% 0.177 275.1)
-
Step 800
800
#3B429D
oklch(42.8% 0.146 275.1)
-
Step 900
900 (this color)
#2B3174
oklch(34.9% 0.114 275)
-
Step 950
950
#1D2249
oklch(27% 0.072 275)
#2B3174 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) | #013B76 | 0.041 |
| Deuteranopia (no green cones) | #003573 | 0.039 |
| Tritanopia (no blue cones) | #00414D | 0.099 |
| Achromatopsia (no color) | #383838 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3174
#2B3174
oklch(34.9% 0.114 275)
- #463900
#463900
oklch(34.8% 0.071 94.6)
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 #2B3174, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.045
- Twilight Blue #0A437A ΔE 0.054
- Marine #042E60 ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.057
- Midnight Blue #191970 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.070
- Cobalt #1E488F ΔE 0.073
- Dark Blue Grey #1F3B4D ΔE 0.082
Use #2B3174 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.