#304C8B
Closest named color: Dusk Blue (#26538D). oklch(42.8% 0.11 264.3), rgb(48, 76, 139).
Aa
White text reads best on this color (8.29:1).
About this color
#304C8B is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.110 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.021 away. White text reads best on it, at 8.29:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.53:1 |
| White text | 8.29:1 |
Values
| HEX | #304C8B |
| RGB | rgb(48, 76, 139) |
| HSL | hsl(222, 49%, 37%) |
| OKLCH | oklch(42.8% 0.11 264.3) |
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 #304C8B | 8.29:1 | AAA | Lc -93.0 | Preferred for body text |
| Black text on #304C8B | 2.53:1 | Fails | Lc 15.6 | Dividers and decoration only |
| #304C8B text on white | 8.29:1 | AAA | Lc 88.4 | Fine for body text |
| #304C8B text on black | 2.53:1 | Fails | Lc -13.8 | 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 800.
-
Step 50
50
#F2F5FB
oklch(97% 0.009 264.5)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CDD9F1
oklch(88.4% 0.036 264.4)
-
Step 300
300
#ACC1EB
oklch(80.9% 0.064 264.1)
-
Step 400
400
#80A0E1
oklch(70.8% 0.102 263.9)
-
Step 500
500
#6187D9
oklch(63.2% 0.131 264.2)
-
Step 600
600
#486FC6
oklch(55.7% 0.142 264.2)
-
Step 700
700
#395CAB
oklch(49% 0.133 264.1)
-
Step 800
800 (this color)
#304C8B
oklch(42.8% 0.11 264.3)
-
Step 900
900
#2A406F
oklch(37.8% 0.085 263.9)
-
Step 950
950
#192541
oklch(26.9% 0.055 265.3)
#304C8B 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) | #2E538D | 0.020 |
| Deuteranopia (no green cones) | #204A8A | 0.018 |
| Tritanopia (no blue cones) | #005A64 | 0.092 |
| Achromatopsia (no color) | #4E4E4E | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304C8B
#304C8B
oklch(42.8% 0.11 264.3)
- #664A00
#664A00
oklch(42.8% 0.088 83.6)
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 #304C8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.021
- Cobalt #1E488F ΔE 0.024
- Light Navy #155084 ΔE 0.028
- Deep Sea Blue #015482 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.042
- Twilight #4E518B ΔE 0.045
- Blueberry #464196 ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.047
Use #304C8B 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.