#304FA5
Closest named color: Dusk Blue (#26538D). oklch(45.4% 0.144 265.9), rgb(48, 79, 165).
Aa
White text reads best on this color (7.53:1).
About this color
#304FA5 is a medium-dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.144 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.044 away. White text reads best on it, at 7.53:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.78:1 |
| White text | 7.53:1 |
Values
| HEX | #304FA5 |
| RGB | rgb(48, 79, 165) |
| HSL | hsl(224, 55%, 42%) |
| OKLCH | oklch(45.4% 0.144 265.9) |
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 #304FA5 | 7.53:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #304FA5 | 2.78:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #304FA5 text on white | 7.53:1 | AAA | Lc 85.8 | Fine for body text |
| #304FA5 text on black | 2.78:1 | Fails | Lc -16.2 | 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 800.
-
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
#A7C0F8
oklch(80.9% 0.084 265.9)
-
Step 400
400
#799DF4
oklch(70.7% 0.134 266)
-
Step 500
500
#5882F0
oklch(63.1% 0.171 266)
-
Step 600
600
#3F68DF
oklch(55.5% 0.187 266.1)
-
Step 700
700
#3256C1
oklch(49.1% 0.173 266.1)
-
Step 800
800 (this color)
#304FA5
oklch(45.4% 0.144 265.9)
-
Step 900
900
#253D7C
oklch(37.8% 0.111 265.7)
-
Step 950
950
#162449
oklch(27% 0.071 266.2)
#304FA5 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) | #195AA8 | 0.031 |
| Deuteranopia (no green cones) | #004FA3 | 0.030 |
| Tritanopia (no blue cones) | #006372 | 0.115 |
| Achromatopsia (no color) | #545454 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304FA5
#304FA5
oklch(45.4% 0.144 265.9)
- #6D5200
#6D5200
oklch(45.4% 0.093 86.5)
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 #304FA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.044
- Cobalt #1E488F ΔE 0.045
- Blueberry #464196 ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.052
- Twilight #4E518B ΔE 0.058
- Light Navy #155084 ΔE 0.061
- Light Navy Blue #2E5A88 ΔE 0.061
- Sapphire #2138AB ΔE 0.062
Use #304FA5 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.