#304FBC
Closest named color: Blue Blue (#2242C7). oklch(47.2% 0.175 267.2), rgb(48, 79, 188).
Aa
White text reads best on this color (7.07:1).
About this color
#304FBC is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.175 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.039 away. White text reads best on it, at 7.07:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.97:1 |
| White text | 7.07:1 |
Values
| HEX | #304FBC |
| RGB | rgb(48, 79, 188) |
| HSL | hsl(227, 59%, 46%) |
| OKLCH | oklch(47.2% 0.175 267.2) |
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 #304FBC | 7.07:1 | AAA | Lc -88.9 | Fine for body text |
| Black text on #304FBC | 2.97:1 | Fails | Lc 20.0 | Dividers and decoration only |
| #304FBC text on white | 7.07:1 | AAA | Lc 84.0 | Fine for body text |
| #304FBC text on black | 2.97:1 | Fails | Lc -18.0 | 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
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9F9
oklch(88.5% 0.047 266.7)
-
Step 300
300
#A8C0F8
oklch(81% 0.084 266.5)
-
Step 400
400
#7B9CF5
oklch(70.6% 0.136 267.5)
-
Step 500
500
#5B81F1
oklch(63.1% 0.173 267.2)
-
Step 600
600
#4267E0
oklch(55.6% 0.189 267.1)
-
Step 700
700 (this color)
#304FBC
oklch(47.2% 0.175 267.2)
-
Step 800
800
#2C469D
oklch(42.7% 0.145 267.3)
-
Step 900
900
#273C7D
oklch(37.7% 0.113 267.3)
-
Step 950
950
#172449
oklch(27.1% 0.071 267.1)
#304FBC 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) | #005FC0 | 0.042 |
| Deuteranopia (no green cones) | #0052BA | 0.027 |
| Tritanopia (no blue cones) | #006A7E | 0.138 |
| Achromatopsia (no color) | #585858 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304FBC
#304FBC
oklch(47.2% 0.175 267.2)
- #735700
#735700
oklch(47.3% 0.097 86.9)
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 #304FBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.039
- Majorelle Blue #3F37C9 ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.059
- Warm Blue #4B57DB ΔE 0.063
- Sapphire #2138AB ΔE 0.066
- Blurple #5539CC ΔE 0.066
- Blueberry #464196 ΔE 0.071
- Mid Blue #276AB3 ΔE 0.074
Use #304FBC 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.