#304FAB
Closest named color: Blueberry (#464196). oklch(45.8% 0.152 266.4), rgb(48, 79, 171).
Aa
White text reads best on this color (7.41:1).
About this color
#304FAB is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.152 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.051 away. White text reads best on it, at 7.41:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.83:1 |
| White text | 7.41:1 |
Values
| HEX | #304FAB |
| RGB | rgb(48, 79, 171) |
| HSL | hsl(225, 56%, 43%) |
| OKLCH | oklch(45.8% 0.152 266.4) |
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 #304FAB | 7.41:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #304FAB | 2.83:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #304FAB text on white | 7.41:1 | AAA | Lc 85.4 | Fine for body text |
| #304FAB text on black | 2.83:1 | Fails | Lc -16.7 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A6C0FB
oklch(81% 0.089 266)
-
Step 400
400
#779CF9
oklch(70.6% 0.143 266.4)
-
Step 500
500
#5680F6
oklch(63% 0.182 266.5)
-
Step 600
600
#3D66E5
oklch(55.5% 0.198 266.4)
-
Step 700
700
#3054C7
oklch(49.1% 0.184 266.3)
-
Step 800
800 (this color)
#304FAB
oklch(45.8% 0.152 266.4)
-
Step 900
900
#243C80
oklch(37.8% 0.119 266.2)
-
Step 950
950
#15244B
oklch(27.1% 0.075 265.8)
#304FAB 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) | #0B5BAE | 0.035 |
| Deuteranopia (no green cones) | #0050A9 | 0.029 |
| Tritanopia (no blue cones) | #006575 | 0.122 |
| Achromatopsia (no color) | #555555 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304FAB
#304FAB
oklch(45.8% 0.152 266.4)
- #6E5300
#6E5300
oklch(45.8% 0.094 86.8)
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 #304FAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.051
- Dusk Blue #26538D ΔE 0.053
- Cobalt #1E488F ΔE 0.053
- Blue Blue #2242C7 ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.058
- Sapphire #2138AB ΔE 0.061
- Twilight #4E518B ΔE 0.065
- Light Navy Blue #2E5A88 ΔE 0.069
Use #304FAB 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.