#303363
Closest named color: Prussian Blue (#1D3557). oklch(34.4% 0.083 278.4), rgb(48, 51, 99).
Aa
White text reads best on this color (11.80:1).
About this color
#303363 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.083 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.035 away. White text reads best on it, at 11.80:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.77:1 |
| White text | 11.80:1 |
Values
| HEX | #303363 |
| RGB | rgb(48, 51, 99) |
| HSL | hsl(236, 35%, 29%) |
| OKLCH | oklch(34.4% 0.083 278.4) |
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 #303363 | 11.80:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #303363 | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #303363 text on white | 11.80:1 | AAA | Lc 97.0 | Preferred for body text |
| #303363 text on black | 1.77:1 | 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
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D3D7F0
oklch(88.4% 0.035 278.4)
-
Step 300
300
#B7BDE9
oklch(80.8% 0.062 278.8)
-
Step 400
400
#929ADE
oklch(70.6% 0.1 278.4)
-
Step 500
500
#7980D5
oklch(63.1% 0.127 278.5)
-
Step 600
600
#6368C2
oklch(55.7% 0.138 278.5)
-
Step 700
700
#5256A8
oklch(49.2% 0.129 278.4)
-
Step 800
800
#434788
oklch(42.8% 0.106 278.3)
-
Step 900
900 (this color)
#303363
oklch(34.4% 0.083 278.4)
-
Step 950
950
#212340
oklch(27% 0.054 279.2)
#303363 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) | #1F3A65 | 0.028 |
| Deuteranopia (no green cones) | #1B3662 | 0.028 |
| Tritanopia (no blue cones) | #1D3D46 | 0.072 |
| Achromatopsia (no color) | #383838 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303363
#303363
oklch(34.4% 0.083 278.4)
- #433900
#433900
oklch(34.5% 0.071 98.2)
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 #303363, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.035
- Marine Blue #01386A ΔE 0.046
- Marine #042E60 ΔE 0.054
- Dark Blue Grey #1F3B4D ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.060
- Twilight Blue #0A437A ΔE 0.061
- Gunmetal #293241 ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.064
Use #303363 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.