#304D98
Closest named color: Dusk Blue (#26538D). oklch(44% 0.128 265.5), rgb(48, 77, 152).
Aa
White text reads best on this color (7.95:1).
About this color
#304D98 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.128 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.028 away. White text reads best on it, at 7.95:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.64:1 |
| White text | 7.95:1 |
Values
| HEX | #304D98 |
| RGB | rgb(48, 77, 152) |
| HSL | hsl(223, 52%, 39%) |
| OKLCH | oklch(44% 0.128 265.5) |
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 #304D98 | 7.95:1 | AAA | Lc -92.0 | Preferred for body text |
| Black text on #304D98 | 2.64:1 | Fails | Lc 16.7 | Dividers and decoration only |
| #304D98 text on white | 7.95:1 | AAA | Lc 87.3 | Fine for body text |
| #304D98 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#AAC0F2
oklch(80.9% 0.075 266.2)
-
Step 400
400
#7D9EEB
oklch(70.6% 0.119 265.8)
-
Step 500
500
#5D84E5
oklch(63.1% 0.152 265.7)
-
Step 600
600
#446BD3
oklch(55.5% 0.166 265.8)
-
Step 700
700
#3659B7
oklch(49.1% 0.154 265.6)
-
Step 800
800 (this color)
#304D98
oklch(44% 0.128 265.5)
-
Step 900
900
#283E76
oklch(37.7% 0.1 265.7)
-
Step 950
950
#172545
oklch(27% 0.063 264.7)
#304D98 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) | #25569B | 0.025 |
| Deuteranopia (no green cones) | #0A4C96 | 0.029 |
| Tritanopia (no blue cones) | #005E6B | 0.104 |
| Achromatopsia (no color) | #515151 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304D98
#304D98
oklch(44% 0.128 265.5)
- #694E00
#694E00
oklch(44.1% 0.09 85.6)
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 #304D98, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.028
- Cobalt #1E488F ΔE 0.028
- Blueberry #464196 ΔE 0.039
- Light Navy #155084 ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.046
- Twilight #4E518B ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.052
Use #304D98 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.