#2D3584
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.131 273.8), rgb(45, 53, 132).
Aa
White text reads best on this color (10.74:1).
About this color
#2D3584 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.131 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.050 away. White text reads best on it, at 10.74:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #2D3584 |
| RGB | rgb(45, 53, 132) |
| HSL | hsl(234, 49%, 35%) |
| OKLCH | oklch(37.2% 0.131 273.8) |
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 #2D3584 | 10.74:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #2D3584 | 1.95:1 | Fails | Lc 9.4 | Not readable |
| #2D3584 text on white | 10.74:1 | AAA | Lc 94.5 | Preferred for body text |
| #2D3584 text on black | 1.95:1 | Fails | Lc -8.1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CDD7FE
oklch(88.4% 0.055 273.9)
-
Step 300
300
#ADBDFF
oklch(81% 0.095 273.6)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6778FF
oklch(63% 0.199 273.8)
-
Step 600
600
#515CF0
oklch(55.6% 0.219 273.6)
-
Step 700
700
#434AD1
oklch(49.1% 0.204 273.8)
-
Step 800
800
#373EA9
oklch(42.8% 0.169 273.9)
-
Step 900
900 (this color)
#2D3584
oklch(37.2% 0.131 273.8)
-
Step 950
950
#1B214E
oklch(27.1% 0.082 273.9)
#2D3584 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) | #004287 | 0.044 |
| Deuteranopia (no green cones) | #003A82 | 0.038 |
| Tritanopia (no blue cones) | #004857 | 0.109 |
| Achromatopsia (no color) | #3E3E3E | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3584
#2D3584
oklch(37.2% 0.131 273.8)
- #4E3F00
#4E3F00
oklch(37.3% 0.076 93.6)
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 #2D3584, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.051
- Cobalt #1E488F ΔE 0.052
- Blueberry #464196 ΔE 0.060
- Marine Blue #01386A ΔE 0.061
- Sapphire #2138AB ΔE 0.066
- Light Navy #155084 ΔE 0.075
- Marine #042E60 ΔE 0.080
Use #2D3584 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.