#304678
Closest named color: Twilight Blue (#0A437A). oklch(40.2% 0.089 264.8), rgb(48, 70, 120).
Aa
White text reads best on this color (9.23:1).
About this color
#304678 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.089 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 9.23:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #304678 |
| RGB | rgb(48, 70, 120) |
| HSL | hsl(222, 43%, 33%) |
| OKLCH | oklch(40.2% 0.089 264.8) |
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 #304678 | 9.23:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #304678 | 2.27:1 | Fails | Lc 12.8 | Not readable |
| #304678 text on white | 9.23:1 | AAA | Lc 91.2 | Preferred for body text |
| #304678 text on black | 2.27:1 | Fails | Lc -11.2 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDD9F2
oklch(88.4% 0.037 265.1)
-
Step 300
300
#ABC1ED
oklch(80.9% 0.067 264.1)
-
Step 400
400
#809FE4
oklch(70.7% 0.107 265.3)
-
Step 500
500
#6086DC
oklch(63.1% 0.137 264.8)
-
Step 600
600
#476EC9
oklch(55.6% 0.148 264.6)
-
Step 700
700
#395BAE
oklch(49% 0.138 265)
-
Step 800
800
#2F4B8D
oklch(42.7% 0.114 264.7)
-
Step 900
900 (this color)
#304678
oklch(40.2% 0.089 264.8)
-
Step 950
950
#192542
oklch(27% 0.057 265.8)
#304678 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) | #314B7A | 0.015 |
| Deuteranopia (no green cones) | #284477 | 0.012 |
| Tritanopia (no blue cones) | #005159 | 0.079 |
| Achromatopsia (no color) | #474747 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304678
#304678
oklch(40.2% 0.089 264.8)
- #5D4400
#5D4400
oklch(40.3% 0.083 84.7)
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 #304678, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Light Navy #155084 ΔE 0.036
- Cobalt #1E488F ΔE 0.041
- Dusk Blue #26538D ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.054
- Light Navy Blue #2E5A88 ΔE 0.060
Use #304678 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.