#304E8F
Closest named color: Dusk Blue (#26538D). oklch(43.6% 0.113 263.7), rgb(48, 78, 143).
Aa
White text reads best on this color (8.03:1).
About this color
#304E8F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.113 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.017 away. White text reads best on it, at 8.03:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.61:1 |
| White text | 8.03:1 |
Values
| HEX | #304E8F |
| RGB | rgb(48, 78, 143) |
| HSL | hsl(221, 50%, 37%) |
| OKLCH | oklch(43.6% 0.113 263.7) |
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 #304E8F | 8.03:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #304E8F | 2.61:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #304E8F text on white | 8.03:1 | AAA | Lc 87.6 | Fine for body text |
| #304E8F text on black | 2.61:1 | Fails | Lc -14.5 | 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
#7EA0E3
oklch(70.7% 0.106 263.3)
-
Step 500
500
#5E87DB
oklch(63.2% 0.135 263.4)
-
Step 600
600
#456FC8
oklch(55.7% 0.146 263.4)
-
Step 700
700
#375CAD
oklch(49.1% 0.136 263.7)
-
Step 800
800 (this color)
#304E8F
oklch(43.6% 0.113 263.7)
-
Step 900
900
#294070
oklch(37.8% 0.087 263.5)
-
Step 950
950
#182542
oklch(26.9% 0.057 264.6)
#304E8F 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) | #2F5591 | 0.020 |
| Deuteranopia (no green cones) | #1F4C8E | 0.018 |
| Tritanopia (no blue cones) | #005D67 | 0.095 |
| Achromatopsia (no color) | #505050 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304E8F
#304E8F
oklch(43.6% 0.113 263.7)
- #694C00
#694C00
oklch(43.6% 0.09 83.3)
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 #304E8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.017
- Cobalt #1E488F ΔE 0.027
- Light Navy #155084 ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.042
- Twilight #4E518B ΔE 0.042
- Blueberry #464196 ΔE 0.045
Use #304E8F 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.