#303367
Closest named color: Prussian Blue (#1D3557). oklch(34.7% 0.089 278.2), rgb(48, 51, 103).
Aa
White text reads best on this color (11.69:1).
About this color
#303367 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.089 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.040 away. White text reads best on it, at 11.69:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.79:1 |
| White text | 11.69:1 |
Values
| HEX | #303367 |
| RGB | rgb(48, 51, 103) |
| HSL | hsl(237, 36%, 30%) |
| OKLCH | oklch(34.7% 0.089 278.2) |
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 #303367 | 11.69:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #303367 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #303367 text on white | 11.69:1 | AAA | Lc 96.7 | Preferred for body text |
| #303367 text on black | 1.79:1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D3D7F2
oklch(88.4% 0.037 278.9)
-
Step 300
300
#B6BDEC
oklch(80.9% 0.067 278.2)
-
Step 400
400
#919AE3
oklch(70.8% 0.107 277.9)
-
Step 500
500
#777FDB
oklch(63.1% 0.137 277.9)
-
Step 600
600
#6166C8
oklch(55.5% 0.149 278.2)
-
Step 700
700
#5154AD
oklch(49% 0.139 278.5)
-
Step 800
800
#42468C
oklch(42.8% 0.114 278)
-
Step 900
900 (this color)
#303367
oklch(34.7% 0.089 278.2)
-
Step 950
950
#202342
oklch(27% 0.057 277.6)
#303367 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) | #1C3A69 | 0.030 |
| Deuteranopia (no green cones) | #173666 | 0.032 |
| Tritanopia (no blue cones) | #1A3E48 | 0.077 |
| Achromatopsia (no color) | #383838 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303367
#303367
oklch(34.7% 0.089 278.2)
- #443A00
#443A00
oklch(34.8% 0.072 98.3)
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 #303367, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.040
- Marine Blue #01386A ΔE 0.045
- Marine #042E60 ΔE 0.055
- Twilight Blue #0A437A ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.062
- Space Cadet #2B2D42 ΔE 0.066
- Dark Grey Blue #29465B ΔE 0.067
- Gunmetal #293241 ΔE 0.069
Use #303367 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.