#303779
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.111 275), rgb(48, 55, 121).
Aa
White text reads best on this color (10.77:1).
About this color
#303779 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.111 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.044 away. White text reads best on it, at 10.77:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.77:1 |
Values
| HEX | #303779 |
| RGB | rgb(48, 55, 121) |
| HSL | hsl(234, 43%, 33%) |
| OKLCH | oklch(36.9% 0.111 275) |
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 #303779 | 10.77:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #303779 | 1.94:1 | Fails | Lc 9.2 | Not readable |
| #303779 text on white | 10.77:1 | AAA | Lc 94.7 | Preferred for body text |
| #303779 text on black | 1.94:1 | Fails | Lc -7.9 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D0D7F9
oklch(88.5% 0.047 276.2)
-
Step 300
300
#B0BDF7
oklch(80.9% 0.083 274.6)
-
Step 400
400
#8998F3
oklch(70.6% 0.134 275.3)
-
Step 500
500
#6E7CEF
oklch(63.1% 0.171 275.2)
-
Step 600
600
#5862DD
oklch(55.6% 0.185 275.1)
-
Step 700
700
#4850C0
oklch(49.1% 0.173 274.9)
-
Step 800
800
#3B429B
oklch(42.6% 0.143 275.1)
-
Step 900
900 (this color)
#303779
oklch(36.9% 0.111 275)
-
Step 950
950
#1D2248
oklch(27% 0.07 275)
#303779 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) | #11417B | 0.038 |
| Deuteranopia (no green cones) | #003B78 | 0.042 |
| Tritanopia (no blue cones) | #004652 | 0.098 |
| Achromatopsia (no color) | #3D3D3D | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303779
#303779
oklch(36.9% 0.111 275)
- #4C3E00
#4C3E00
oklch(36.8% 0.075 94.5)
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 #303779, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.044
- Marine Blue #01386A ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.052
- Cobalt #1E488F ΔE 0.056
- Blueberry #464196 ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.066
- Light Navy #155084 ΔE 0.072
- Marine #042E60 ΔE 0.072
Use #303779 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.