#304FBB
Closest named color: Blue Blue (#2242C7). oklch(47.1% 0.174 267.1), rgb(48, 79, 187).
Aa
White text reads best on this color (7.09:1).
About this color
#304FBB is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.174 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 7.09:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.96:1 |
| White text | 7.09:1 |
Values
| HEX | #304FBB |
| RGB | rgb(48, 79, 187) |
| HSL | hsl(227, 59%, 46%) |
| OKLCH | oklch(47.1% 0.174 267.1) |
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 #304FBB | 7.09:1 | AAA | Lc -89.0 | Fine for body text |
| Black text on #304FBB | 2.96:1 | Fails | Lc 20.0 | Dividers and decoration only |
| #304FBB text on white | 7.09:1 | AAA | Lc 84.1 | Fine for body text |
| #304FBB text on black | 2.96:1 | Fails | Lc -17.9 | 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 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
#7B9DF5
oklch(70.8% 0.135 267)
-
Step 500
500
#5B81F0
oklch(63.1% 0.172 267.2)
-
Step 600
600
#4367DF
oklch(55.5% 0.187 267.4)
-
Step 700
700 (this color)
#304FBB
oklch(47.1% 0.174 267.1)
-
Step 800
800
#2C469D
oklch(42.7% 0.145 267.3)
-
Step 900
900
#273C7C
oklch(37.6% 0.112 267.2)
-
Step 950
950
#172449
oklch(27.1% 0.071 267.1)
#304FBB 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) | #005FBF | 0.043 |
| Deuteranopia (no green cones) | #0052B9 | 0.027 |
| Tritanopia (no blue cones) | #006A7D | 0.138 |
| Achromatopsia (no color) | #585858 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304FBB
#304FBB
oklch(47.1% 0.174 267.1)
- #725700
#725700
oklch(47.2% 0.096 87.7)
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 #304FBB, 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 0.064
- Sapphire #2138AB ΔE 0.065
- Blurple #5539CC ΔE 0.067
- Blueberry #464196 ΔE 0.070
- Mid Blue #276AB3 ΔE 0.073
Use #304FBB 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.