#2D3179
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.121 275.9), rgb(45, 49, 121).
Aa
White text reads best on this color (11.49:1).
About this color
#2D3179 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.121 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.051 away. White text reads best on it, at 11.49:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.82:1 |
| White text | 11.49:1 |
Values
| HEX | #2D3179 |
| RGB | rgb(45, 49, 121) |
| HSL | hsl(237, 46%, 33%) |
| OKLCH | oklch(35.5% 0.121 275.9) |
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 #2D3179 | 11.49:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #2D3179 | 1.82:1 | Fails | Lc 7.7 | Not readable |
| #2D3179 text on white | 11.49:1 | AAA | Lc 96.1 | Preferred for body text |
| #2D3179 text on black | 1.82:1 | 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
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#B0BCFB
oklch(80.9% 0.09 275.9)
-
Step 400
400
#8997FA
oklch(70.8% 0.145 276)
-
Step 500
500
#6E79F7
oklch(63.1% 0.186 276)
-
Step 600
600
#595EE5
oklch(55.6% 0.2 276.1)
-
Step 700
700
#494CC7
oklch(49% 0.187 276)
-
Step 800
800
#3C40A1
oklch(42.8% 0.154 275.9)
-
Step 900
900 (this color)
#2D3179
oklch(35.5% 0.121 275.9)
-
Step 950
950
#1D214B
oklch(27% 0.077 275.9)
#2D3179 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) | #003D7B | 0.045 |
| Deuteranopia (no green cones) | #003678 | 0.041 |
| Tritanopia (no blue cones) | #004250 | 0.103 |
| Achromatopsia (no color) | #393939 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3179
#2D3179
oklch(35.5% 0.121 275.9)
- #473B00
#473B00
oklch(35.4% 0.073 96.2)
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 #2D3179, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.051
- Twilight Blue #0A437A ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.064
- Marine #042E60 ΔE 0.064
- Prussian Blue #1D3557 ΔE 0.066
- Cobalt #1E488F ΔE 0.069
- Midnight Blue #191970 ΔE 0.071
- Blueberry #464196 ΔE 0.076
Use #2D3179 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.