#303564
Closest named color: Prussian Blue (#1D3557). oklch(34.9% 0.081 276.7), rgb(48, 53, 100).
Aa
White text reads best on this color (11.54:1).
About this color
#303564 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.081 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.036 away. White text reads best on it, at 11.54:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.81:1 |
| White text | 11.54:1 |
Values
| HEX | #303564 |
| RGB | rgb(48, 53, 100) |
| HSL | hsl(234, 35%, 29%) |
| OKLCH | oklch(34.9% 0.081 276.7) |
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 #303564 | 11.54:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #303564 | 1.81:1 | Fails | Lc 7.4 | Not readable |
| #303564 text on white | 11.54:1 | AAA | Lc 96.5 | Preferred for body text |
| #303564 text on black | 1.81:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D3D8F0
oklch(88.6% 0.033 276.3)
-
Step 300
300
#B6BEE9
oklch(81% 0.061 276.7)
-
Step 400
400
#919BDD
oklch(70.7% 0.097 277)
-
Step 500
500
#7781D4
oklch(63.1% 0.125 277)
-
Step 600
600
#6069C1
oklch(55.6% 0.135 276.6)
-
Step 700
700
#5057A7
oklch(49.1% 0.126 276.9)
-
Step 800
800
#414787
oklch(42.6% 0.105 276.9)
-
Step 900
900 (this color)
#303564
oklch(34.9% 0.081 276.7)
-
Step 950
950
#20243F
oklch(27.1% 0.05 276.1)
#303564 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) | #223B66 | 0.024 |
| Deuteranopia (no green cones) | #1D3763 | 0.025 |
| Tritanopia (no blue cones) | #1C3F47 | 0.072 |
| Achromatopsia (no color) | #393939 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303564
#303564
oklch(34.9% 0.081 276.7)
- #453A00
#453A00
oklch(35% 0.072 97.2)
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 #303564, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.036
- Marine Blue #01386A ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.054
- Marine #042E60 ΔE 0.056
- Twilight Blue #0A437A ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.059
- Space Cadet #2B2D42 ΔE 0.062
- Gunmetal #293241 ΔE 0.063
Use #303564 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.