#304C90
Closest named color: Dusk Blue (#26538D). oklch(43.2% 0.117 265), rgb(48, 76, 144).
Aa
White text reads best on this color (8.19:1).
About this color
#304C90 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.117 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.022 away. White text reads best on it, at 8.19:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.56:1 |
| White text | 8.19:1 |
Values
| HEX | #304C90 |
| RGB | rgb(48, 76, 144) |
| HSL | hsl(223, 50%, 38%) |
| OKLCH | oklch(43.2% 0.117 265) |
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 #304C90 | 8.19:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #304C90 | 2.56:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #304C90 text on white | 8.19:1 | AAA | Lc 88.1 | Fine for body text |
| #304C90 text on black | 2.56:1 | Fails | Lc -14.1 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F3
oklch(88.4% 0.038 265.8)
-
Step 300
300
#ABC1EE
oklch(81% 0.068 264.5)
-
Step 400
400
#7F9FE5
oklch(70.7% 0.109 265)
-
Step 500
500
#5F85DE
oklch(63% 0.141 265.2)
-
Step 600
600
#476DCB
oklch(55.5% 0.152 265.2)
-
Step 700
700
#385BB0
oklch(49.1% 0.141 264.8)
-
Step 800
800 (this color)
#304C90
oklch(43.2% 0.117 265)
-
Step 900
900
#293F72
oklch(37.7% 0.092 264.8)
-
Step 950
950
#182543
oklch(27% 0.059 265)
#304C90 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) | #2A5493 | 0.022 |
| Deuteranopia (no green cones) | #194B8F | 0.022 |
| Tritanopia (no blue cones) | #005C67 | 0.098 |
| Achromatopsia (no color) | #4F4F4F | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304C90
#304C90
oklch(43.2% 0.117 265)
- #664C00
#664C00
oklch(43.2% 0.089 85.9)
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 #304C90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.022
- Cobalt #1E488F ΔE 0.023
- Light Navy #155084 ΔE 0.033
- Blueberry #464196 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.045
- Twilight #4E518B ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.047
Use #304C90 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.