#304CAB
Closest named color: Blueberry (#464196). oklch(45.2% 0.156 267.4), rgb(48, 76, 171).
Aa
White text reads best on this color (7.64:1).
About this color
#304CAB is a medium-dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.156 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.048 away. White text reads best on it, at 7.64:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.74:1 |
| White text | 7.64:1 |
Values
| HEX | #304CAB |
| RGB | rgb(48, 76, 171) |
| HSL | hsl(226, 56%, 43%) |
| OKLCH | oklch(45.2% 0.156 267.4) |
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 #304CAB | 7.64:1 | AAA | Lc -90.9 | Preferred for body text |
| Black text on #304CAB | 2.74:1 | Fails | Lc 17.9 | Dividers and decoration only |
| #304CAB text on white | 7.64:1 | AAA | Lc 86.1 | Fine for body text |
| #304CAB text on black | 2.74:1 | Fails | Lc -15.9 | 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
#CAD9FC
oklch(88.5% 0.051 267)
-
Step 300
300
#A7BFFC
oklch(80.9% 0.091 267.7)
-
Step 400
400
#789CFB
oklch(70.8% 0.145 267)
-
Step 500
500
#587FF9
oklch(63.1% 0.187 267.5)
-
Step 600
600
#4065E8
oklch(55.7% 0.202 267.4)
-
Step 700
700
#3252C9
oklch(49% 0.188 267.4)
-
Step 800
800 (this color)
#304CAB
oklch(45.2% 0.156 267.4)
-
Step 900
900
#253B81
oklch(37.7% 0.121 267.2)
-
Step 950
950
#16234C
oklch(27% 0.078 267.7)
#304CAB 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) | #0059AE | 0.039 |
| Deuteranopia (no green cones) | #004EA9 | 0.029 |
| Tritanopia (no blue cones) | #006374 | 0.125 |
| Achromatopsia (no color) | #535353 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304CAB
#304CAB
oklch(45.2% 0.156 267.4)
- #6C5200
#6C5200
oklch(45.3% 0.093 87.4)
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 #304CAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.048
- Cobalt #1E488F ΔE 0.051
- Blue Blue #2242C7 ΔE 0.053
- Sapphire #2138AB ΔE 0.053
- Dusk Blue #26538D ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.067
Use #304CAB 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.