#2D3773
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.103 273.1), rgb(45, 55, 115).
Aa
White text reads best on this color (11.02:1).
About this color
#2D3773 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.103 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.042 away. White text reads best on it, at 11.02:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.02:1 |
Values
| HEX | #2D3773 |
| RGB | rgb(45, 55, 115) |
| HSL | hsl(231, 44%, 31%) |
| OKLCH | oklch(36.2% 0.103 273.1) |
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 #2D3773 | 11.02:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #2D3773 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #2D3773 text on white | 11.02:1 | AAA | Lc 95.3 | Preferred for body text |
| #2D3773 text on black | 1.90:1 | Fails | Lc -7.4 | 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
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#B0BEF3
oklch(80.9% 0.077 273.1)
-
Step 400
400
#879AED
oklch(70.6% 0.124 273.1)
-
Step 500
500
#6B7FE8
oklch(63.1% 0.158 272.9)
-
Step 600
600
#5566D6
oklch(55.7% 0.171 273)
-
Step 700
700
#4654B9
oklch(49.1% 0.159 273.2)
-
Step 800
800
#394596
oklch(42.7% 0.132 273.1)
-
Step 900
900 (this color)
#2D3773
oklch(36.2% 0.103 273.1)
-
Step 950
950
#1C2346
oklch(27% 0.065 272.8)
#2D3773 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) | #183F75 | 0.029 |
| Deuteranopia (no green cones) | #0B3972 | 0.033 |
| Tritanopia (no blue cones) | #00454F | 0.092 |
| Achromatopsia (no color) | #3C3C3C | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3773
#2D3773
oklch(36.2% 0.103 273.1)
- #4B3C00
#4B3C00
oklch(36.2% 0.074 93)
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 #2D3773, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.042
- Marine Blue #01386A ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.062
- Cobalt #1E488F ΔE 0.062
- Marine #042E60 ΔE 0.063
- Dark Grey Blue #29465B ΔE 0.068
- Light Navy #155084 ΔE 0.073
Use #2D3773 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.