#304B94
Closest named color: Cobalt (#1E488F). oklch(43.3% 0.124 266.1), rgb(48, 75, 148).
Aa
White text reads best on this color (8.20:1).
About this color
#304B94 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.124 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.023 away. White text reads best on it, at 8.20:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.55:1 |
| White text | 8.20:1 |
Values
| HEX | #304B94 |
| RGB | rgb(48, 75, 148) |
| HSL | hsl(224, 51%, 38%) |
| OKLCH | oklch(43.3% 0.124 266.1) |
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 #304B94 | 8.20:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #304B94 | 2.55:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #304B94 text on white | 8.20:1 | AAA | Lc 88.1 | Fine for body text |
| #304B94 text on black | 2.55:1 | Fails | Lc -14.1 | 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
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ABC0F1
oklch(80.9% 0.073 266.7)
-
Step 400
400
#7F9EE9
oklch(70.7% 0.116 266.4)
-
Step 500
500
#5F84E3
oklch(63.1% 0.149 266.2)
-
Step 600
600
#466CD1
oklch(55.7% 0.162 265.9)
-
Step 700
700
#3859B5
oklch(49.1% 0.151 266.1)
-
Step 800
800 (this color)
#304B94
oklch(43.3% 0.124 266.1)
-
Step 900
900
#293E75
oklch(37.7% 0.098 266.1)
-
Step 950
950
#182544
oklch(27% 0.061 265.4)
#304B94 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) | #245497 | 0.025 |
| Deuteranopia (no green cones) | #0D4B92 | 0.028 |
| Tritanopia (no blue cones) | #005C68 | 0.103 |
| Achromatopsia (no color) | #4F4F4F | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B94
#304B94
oklch(43.3% 0.124 266.1)
- #664C00
#664C00
oklch(43.2% 0.089 85.9)
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 #304B94, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.023
- Dusk Blue #26538D ΔE 0.028
- Blueberry #464196 ΔE 0.037
- Light Navy #155084 ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.047
- Twilight #4E518B ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.051
Use #304B94 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.