#304EB8
Closest named color: Blue Blue (#2242C7). oklch(46.7% 0.171 267.3), rgb(48, 78, 184).
Aa
White text reads best on this color (7.22:1).
About this color
#304EB8 is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.171 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.040 away. White text reads best on it, at 7.22:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.90:1 |
| White text | 7.22:1 |
Values
| HEX | #304EB8 |
| RGB | rgb(48, 78, 184) |
| HSL | hsl(227, 59%, 45%) |
| OKLCH | oklch(46.7% 0.171 267.3) |
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 #304EB8 | 7.22:1 | AAA | Lc -89.5 | Fine for body text |
| Black text on #304EB8 | 2.90:1 | Fails | Lc 19.5 | Dividers and decoration only |
| #304EB8 text on white | 7.22:1 | AAA | Lc 84.6 | Fine for body text |
| #304EB8 text on black | 2.90:1 | Fails | Lc -17.4 | 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 700.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#A9C0F7
oklch(81% 0.082 266.9)
-
Step 400
400
#7C9DF3
oklch(70.8% 0.132 267.1)
-
Step 500
500
#5C81EF
oklch(63.1% 0.17 267.4)
-
Step 600
600
#4468DD
oklch(55.6% 0.183 267.3)
-
Step 700
700 (this color)
#304EB8
oklch(46.7% 0.171 267.3)
-
Step 800
800
#2D479B
oklch(42.8% 0.141 267.2)
-
Step 900
900
#283C7B
oklch(37.6% 0.11 267.6)
-
Step 950
950
#172448
oklch(27% 0.069 266.8)
#304EB8 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) | #005EBC | 0.043 |
| Deuteranopia (no green cones) | #0051B6 | 0.028 |
| Tritanopia (no blue cones) | #00687B | 0.136 |
| Achromatopsia (no color) | #575757 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304EB8
#304EB8
oklch(46.7% 0.171 267.3)
- #715600
#715600
oklch(46.8% 0.096 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 #304EB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.040
- Majorelle Blue #3F37C9 ΔE 0.055
- Blue With A Hint Of Purple #533CC6 ΔE 0.060
- Sapphire #2138AB ΔE 0.061
- Blueberry #464196 ΔE 0.065
- Blurple #5539CC ΔE 0.068
- Warm Blue #4B57DB ΔE 0.069
- Cobalt #1E488F ΔE 0.071
Use #304EB8 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.