#304BBD
Closest named color: Blue Blue (#2242C7). oklch(46.5% 0.181 268.2), rgb(48, 75, 189).
Aa
White text reads best on this color (7.32:1).
About this color
#304BBD is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.181 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.030 away. White text reads best on it, at 7.32:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.181) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.86:1 |
| White text | 7.32:1 |
Values
| HEX | #304BBD |
| RGB | rgb(48, 75, 189) |
| HSL | hsl(229, 59%, 46%) |
| OKLCH | oklch(46.5% 0.181 268.2) |
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 #304BBD | 7.32:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #304BBD | 2.86:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #304BBD text on white | 7.32:1 | AAA | Lc 84.9 | Fine for body text |
| #304BBD text on black | 2.86:1 | Fails | Lc -17.1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CBD9FA
oklch(88.5% 0.048 267.2)
-
Step 300
300
#A8BFFA
oklch(80.9% 0.088 267.9)
-
Step 400
400
#7B9CF8
oklch(70.8% 0.14 267.8)
-
Step 500
500
#5C7FF5
oklch(63% 0.18 268.4)
-
Step 600
600
#4465E4
oklch(55.6% 0.196 268.3)
-
Step 700
700 (this color)
#304BBD
oklch(46.5% 0.181 268.2)
-
Step 800
800
#2D45A0
oklch(42.8% 0.15 268.2)
-
Step 900
900
#273B7F
oklch(37.7% 0.118 268)
-
Step 950
950
#17234A
oklch(26.9% 0.074 268.3)
#304BBD 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) | #005DC1 | 0.046 |
| Deuteranopia (no green cones) | #0050BB | 0.028 |
| Tritanopia (no blue cones) | #00687D | 0.143 |
| Achromatopsia (no color) | #565656 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304BBD
#304BBD
oklch(46.5% 0.181 268.2)
- #6F5600
#6F5600
oklch(46.6% 0.095 89.1)
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 #304BBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.030
- Majorelle Blue #3F37C9 ΔE 0.045
- Blue With A Hint Of Purple #533CC6 ΔE 0.054
- Sapphire #2138AB ΔE 0.058
- Blurple #5539CC ΔE 0.061
- Warm Blue #4B57DB ΔE 0.066
- Blueberry #464196 ΔE 0.070
- Bluey Purple #6241C7 ΔE 0.073
Use #304BBD 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.