#2A3563
Closest named color: Prussian Blue (#1D3557). oklch(34.4% 0.082 271.4), rgb(42, 53, 99).
Aa
White text reads best on this color (11.74:1).
About this color
#2A3563 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.082 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.028 away. White text reads best on it, at 11.74:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.78:1 |
| White text | 11.74:1 |
Values
| HEX | #2A3563 |
| RGB | rgb(42, 53, 99) |
| HSL | hsl(228, 40%, 28%) |
| OKLCH | oklch(34.4% 0.082 271.4) |
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 #2A3563 | 11.74:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #2A3563 | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #2A3563 text on white | 11.74:1 | AAA | Lc 96.8 | Preferred for body text |
| #2A3563 text on black | 1.78:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5E9F6
oklch(93.5% 0.018 272.3)
-
Step 200
200
#D1D8F0
oklch(88.4% 0.034 272.8)
-
Step 300
300
#B2BFE9
oklch(80.9% 0.061 271.5)
-
Step 400
400
#8A9DDE
oklch(70.7% 0.098 271.2)
-
Step 500
500
#6E84D5
oklch(63.2% 0.125 271)
-
Step 600
600
#576CC2
oklch(55.6% 0.135 271.1)
-
Step 700
700
#4859A8
oklch(49.1% 0.127 271.8)
-
Step 800
800
#3B4988
oklch(42.6% 0.105 271.8)
-
Step 900
900 (this color)
#2A3563
oklch(34.4% 0.082 271.4)
-
Step 950
950
#1D2440
oklch(26.9% 0.053 271.8)
#2A3563 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) | #213B65 | 0.020 |
| Deuteranopia (no green cones) | #1B3662 | 0.019 |
| Tritanopia (no blue cones) | #0D3F47 | 0.072 |
| Achromatopsia (no color) | #383838 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3563
#2A3563
oklch(34.4% 0.082 271.4)
- #463700
#463700
oklch(34.3% 0.07 91.8)
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 #2A3563, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.028
- Marine Blue #01386A ΔE 0.036
- Marine #042E60 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.050
- Twilight Blue #0A437A ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.059
- Space Cadet #2B2D42 ΔE 0.059
- Gunmetal #293241 ΔE 0.060
Use #2A3563 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.