#304F8F
Closest named color: Dusk Blue (#26538D). oklch(43.8% 0.112 263.1), rgb(48, 79, 143).
Aa
White text reads best on this color (7.95:1).
About this color
#304F8F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.112 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.015 away. White text reads best on it, at 7.95:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.64:1 |
| White text | 7.95:1 |
Values
| HEX | #304F8F |
| RGB | rgb(48, 79, 143) |
| HSL | hsl(220, 50%, 37%) |
| OKLCH | oklch(43.8% 0.112 263.1) |
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 #304F8F | 7.95:1 | AAA | Lc -92.0 | Preferred for body text |
| Black text on #304F8F | 2.64:1 | Fails | Lc 16.7 | Dividers and decoration only |
| #304F8F text on white | 7.95:1 | AAA | Lc 87.3 | Fine for body text |
| #304F8F text on black | 2.64:1 | Fails | Lc -14.8 | Not readable |
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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF2
oklch(88.6% 0.036 262.8)
-
Step 300
300
#ABC1EC
oklch(80.9% 0.066 263.7)
-
Step 400
400
#7EA0E2
oklch(70.7% 0.104 263.1)
-
Step 500
500
#5E87DA
oklch(63.1% 0.134 263.2)
-
Step 600
600
#446FC7
oklch(55.5% 0.145 262.9)
-
Step 700
700
#365CAC
oklch(49% 0.135 263.2)
-
Step 800
800 (this color)
#304F8F
oklch(43.8% 0.112 263.1)
-
Step 900
900
#284070
oklch(37.8% 0.088 262.8)
-
Step 950
950
#182641
oklch(27.1% 0.054 262.5)
#304F8F 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) | #315691 | 0.020 |
| Deuteranopia (no green cones) | #214D8E | 0.017 |
| Tritanopia (no blue cones) | #005E68 | 0.093 |
| Achromatopsia (no color) | #515151 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304F8F
#304F8F
oklch(43.8% 0.112 263.1)
- #6A4C00
#6A4C00
oklch(43.7% 0.09 82.4)
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 #304F8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.015
- Cobalt #1E488F ΔE 0.029
- Light Navy #155084 ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.041
- Twilight #4E518B ΔE 0.041
- Blueberry #464196 ΔE 0.047
Use #304F8F 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.