#304E9A
Closest named color: Dusk Blue (#26538D). oklch(44.3% 0.129 265.3), rgb(48, 78, 154).
Aa
White text reads best on this color (7.82:1).
About this color
#304E9A is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.129 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.029 away. White text reads best on it, at 7.82:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.68:1 |
| White text | 7.82:1 |
Values
| HEX | #304E9A |
| RGB | rgb(48, 78, 154) |
| HSL | hsl(223, 52%, 40%) |
| OKLCH | oklch(44.3% 0.129 265.3) |
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 #304E9A | 7.82:1 | AAA | Lc -91.6 | Preferred for body text |
| Black text on #304E9A | 2.68:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #304E9A text on white | 7.82:1 | AAA | Lc 86.9 | Fine for body text |
| #304E9A text on black | 2.68:1 | Fails | Lc -15.2 | Dividers and decoration only |
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 800.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#A9C0F2
oklch(80.8% 0.075 265.5)
-
Step 400
400
#7C9EEC
oklch(70.6% 0.121 265.5)
-
Step 500
500
#5B84E6
oklch(63% 0.154 265.2)
-
Step 600
600
#436BD4
oklch(55.5% 0.168 265.5)
-
Step 700
700
#3559B8
oklch(49.1% 0.156 265.4)
-
Step 800
800 (this color)
#304E9A
oklch(44.3% 0.129 265.3)
-
Step 900
900
#273E76
oklch(37.7% 0.1 265.2)
-
Step 950
950
#172545
oklch(27% 0.063 264.7)
#304E9A 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) | #25579D | 0.025 |
| Deuteranopia (no green cones) | #094D98 | 0.029 |
| Tritanopia (no blue cones) | #00606C | 0.107 |
| Achromatopsia (no color) | #525252 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304E9A
#304E9A
oklch(44.3% 0.129 265.3)
- #6A4F00
#6A4F00
oklch(44.4% 0.091 85.8)
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 #304E9A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.029
- Cobalt #1E488F ΔE 0.032
- Blueberry #464196 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.045
- Light Navy #155084 ΔE 0.045
- Twilight #4E518B ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.054
Use #304E9A 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.