#2D3583
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.13 273.8), rgb(45, 53, 131).
Aa
White text reads best on this color (10.77:1).
About this color
#2D3583 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.130 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.049 away. White text reads best on it, at 10.77:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.77:1 |
Values
| HEX | #2D3583 |
| RGB | rgb(45, 53, 131) |
| HSL | hsl(234, 49%, 35%) |
| OKLCH | oklch(37.1% 0.13 273.8) |
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 #2D3583 | 10.77:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #2D3583 | 1.94:1 | Fails | Lc 9.3 | Not readable |
| #2D3583 text on white | 10.77:1 | AAA | Lc 94.6 | Preferred for body text |
| #2D3583 text on black | 1.94:1 | Fails | Lc -8.0 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
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
#525CEF
oklch(55.6% 0.217 273.9)
-
Step 700
700
#434BD0
oklch(49.2% 0.201 273.6)
-
Step 800
800
#373EA8
oklch(42.7% 0.167 274)
-
Step 900
900 (this color)
#2D3583
oklch(37.1% 0.13 273.8)
-
Step 950
950
#1B214E
oklch(27.1% 0.082 273.9)
#2D3583 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) | #004186 | 0.043 |
| Deuteranopia (no green cones) | #003A81 | 0.038 |
| Tritanopia (no blue cones) | #004856 | 0.110 |
| Achromatopsia (no color) | #3E3E3E | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3583
#2D3583
oklch(37.1% 0.13 273.8)
- #4D3F00
#4D3F00
oklch(37.2% 0.076 94.7)
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 #2D3583, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.051
- Cobalt #1E488F ΔE 0.053
- Marine Blue #01386A ΔE 0.060
- Blueberry #464196 ΔE 0.060
- Sapphire #2138AB ΔE 0.067
- Light Navy #155084 ΔE 0.075
- Marine #042E60 ΔE 0.079
Use #2D3583 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.