#304ED3
Closest named color: Blue Blue (#2242C7). oklch(49% 0.207 267.8), rgb(48, 78, 211).
Aa
White text reads best on this color (6.65:1).
About this color
#304ED3 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.207 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.038 away. White text reads best on it, at 6.65:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.207) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 3.15:1 |
| White text | 6.65:1 |
Values
| HEX | #304ED3 |
| RGB | rgb(48, 78, 211) |
| HSL | hsl(229, 65%, 51%) |
| OKLCH | oklch(49% 0.207 267.8) |
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 #304ED3 | 6.65:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #304ED3 | 3.15:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #304ED3 text on white | 6.65:1 | AA | Lc 82.2 | Fine for body text |
| #304ED3 text on black | 3.15:1 | AA large text | Lc -19.7 | 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 700.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#779BFF
oklch(70.7% 0.152 267.5)
-
Step 500
500
#567DFF
oklch(63% 0.198 267.8)
-
Step 600
600
#3D60F3
oklch(55.5% 0.223 267.9)
-
Step 700
700 (this color)
#304ED3
oklch(49% 0.207 267.8)
-
Step 800
800
#2841AB
oklch(42.7% 0.172 267.9)
-
Step 900
900
#233987
oklch(37.7% 0.133 267.6)
-
Step 950
950
#15224F
oklch(27% 0.084 268.2)
#304ED3 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) | #0064D7 | 0.052 |
| Deuteranopia (no green cones) | #0055D0 | 0.027 |
| Tritanopia (no blue cones) | #007189 | 0.162 |
| Achromatopsia (no color) | #5C5C5C | 0.207 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304ED3
#304ED3
oklch(49% 0.207 267.8)
- #785C00
#785C00
oklch(49% 0.1 87.9)
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 #304ED3, closest first.
No curated palette has a color within ΔE 0.04 of #304ED3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.038
- Warm Blue #4B57DB ΔE 0.042
- Majorelle Blue #3F37C9 ΔE 0.049
- Azul #1D5DEC ΔE 0.051
- Blue With A Hint Of Purple #533CC6 ΔE 0.057
- Blurple #5539CC ΔE 0.060
- Neon Blue #4361EE ΔE 0.066
- Electric Blue #0652FF ΔE 0.070
Use #304ED3 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.