#304780
Closest named color: Cobalt (#1E488F). oklch(41% 0.1 265.7), rgb(48, 71, 128).
Aa
White text reads best on this color (8.97:1).
About this color
#304780 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.100 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.029 away. White text reads best on it, at 8.97:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.33:1 |
| White text | 8.97:1 |
Values
| HEX | #304780 |
| RGB | rgb(48, 71, 128) |
| HSL | hsl(223, 45%, 35%) |
| OKLCH | oklch(41% 0.1 265.7) |
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 #304780 | 8.97:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #304780 | 2.33:1 | Fails | Lc 13.6 | Not readable |
| #304780 text on white | 8.97:1 | AAA | Lc 90.4 | Preferred for body text |
| #304780 text on black | 2.33:1 | Fails | Lc -11.9 | 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 800.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CFD9EF
oklch(88.4% 0.032 266.1)
-
Step 300
300
#AFC1E7
oklch(81% 0.057 265.2)
-
Step 400
400
#859FDB
oklch(70.6% 0.093 266)
-
Step 500
500
#6787D2
oklch(63.2% 0.119 265.6)
-
Step 600
600
#4F6FBF
oklch(55.6% 0.13 265.9)
-
Step 700
700
#405DA5
oklch(49.2% 0.12 265.7)
-
Step 800
800 (this color)
#304780
oklch(41% 0.1 265.7)
-
Step 900
900
#2E406B
oklch(37.8% 0.077 265.7)
-
Step 950
950
#1B263F
oklch(27.2% 0.049 265.2)
#304780 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) | #2D4D82 | 0.017 |
| Deuteranopia (no green cones) | #22467F | 0.016 |
| Tritanopia (no blue cones) | #00545D | 0.087 |
| Achromatopsia (no color) | #494949 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304780
#304780
oklch(41% 0.1 265.7)
- #5F4600
#5F4600
oklch(41% 0.084 85.2)
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 #304780, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.029
- Light Navy #155084 ΔE 0.031
- Dusk Blue #26538D ΔE 0.037
- Twilight Blue #0A437A ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.047
- Blueberry #464196 ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.055
Use #304780 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.