#303864
Closest named color: Prussian Blue (#1D3557). oklch(35.6% 0.077 274.1), rgb(48, 56, 100).
Aa
White text reads best on this color (11.19:1).
About this color
#303864 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.077 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.037 away. White text reads best on it, at 11.19:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.87:1 |
| White text | 11.19:1 |
Values
| HEX | #303864 |
| RGB | rgb(48, 56, 100) |
| HSL | hsl(231, 35%, 29%) |
| OKLCH | oklch(35.6% 0.077 274.1) |
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 #303864 | 11.19:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #303864 | 1.87:1 | Fails | Lc 8.1 | Not readable |
| #303864 text on white | 11.19:1 | AAA | Lc 95.8 | Preferred for body text |
| #303864 text on black | 1.87:1 | 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
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B5BFE7
oklch(81% 0.058 274)
-
Step 400
400
#8F9CDA
oklch(70.6% 0.092 274.7)
-
Step 500
500
#7483D0
oklch(63.1% 0.117 274.2)
-
Step 600
600
#5D6BBD
oklch(55.5% 0.128 274.2)
-
Step 700
700
#4D59A3
oklch(49.1% 0.119 274.3)
-
Step 800
800
#3F4984
oklch(42.7% 0.098 274.2)
-
Step 900
900 (this color)
#303864
oklch(35.6% 0.077 274.1)
-
Step 950
950
#1F243E
oklch(26.9% 0.049 274.4)
#303864 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) | #273D66 | 0.018 |
| Deuteranopia (no green cones) | #223963 | 0.019 |
| Tritanopia (no blue cones) | #1C4149 | 0.067 |
| Achromatopsia (no color) | #3B3B3B | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303864
#303864
oklch(35.6% 0.077 274.1)
- #493B00
#493B00
oklch(35.7% 0.073 93.9)
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 #303864, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.037
- Marine Blue #01386A ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.051
- Twilight Blue #0A437A ΔE 0.052
- Charcoal #264653 ΔE 0.061
- Marine #042E60 ΔE 0.061
- Gunmetal #293241 ΔE 0.063
Use #303864 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.