#304B73
Closest named color: Light Navy (#155084). oklch(41.1% 0.075 258), rgb(48, 75, 115).
Aa
White text reads best on this color (8.82:1).
About this color
#304B73 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.075 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy (#155084), ΔE 0.034 away. White text reads best on it, at 8.82:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Light Navy (#155084) |
| Black text | 2.37:1 |
| White text | 8.82:1 |
Values
| HEX | #304B73 |
| RGB | rgb(48, 75, 115) |
| HSL | hsl(216, 41%, 32%) |
| OKLCH | oklch(41.1% 0.075 258) |
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 #304B73 | 8.82:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #304B73 | 2.37:1 | Fails | Lc 13.9 | Not readable |
| #304B73 text on white | 8.82:1 | AAA | Lc 90.1 | Preferred for body text |
| #304B73 text on black | 2.37:1 | Fails | Lc -12.2 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#CFDAEA
oklch(88.5% 0.025 257.6)
-
Step 300
300
#AFC2DD
oklch(80.8% 0.044 257.1)
-
Step 400
400
#86A2CD
oklch(70.7% 0.071 258.8)
-
Step 500
500
#678BC0
oklch(63.2% 0.09 257.9)
-
Step 600
600
#4E74AC
oklch(55.6% 0.098 257.9)
-
Step 700
700
#3F6194
oklch(49.1% 0.091 258.3)
-
Step 800
800 (this color)
#304B73
oklch(41.1% 0.075 258)
-
Step 900
900
#2E4261
oklch(37.7% 0.059 258.9)
-
Step 950
950
#1B2739
oklch(27.1% 0.038 258.3)
#304B73 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) | #3B4E75 | 0.018 |
| Deuteranopia (no green cones) | #324772 | 0.012 |
| Tritanopia (no blue cones) | #035459 | 0.068 |
| Achromatopsia (no color) | #4A4A4A | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B73
#304B73
oklch(41.1% 0.075 258)
- #614512
#614512
oklch(41.1% 0.076 78.2)
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 #304B73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy #155084 ΔE 0.034
- Deep Sea Blue #015482 ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.043
- Dusk Blue #26538D ΔE 0.045
- Twilight Blue #0A437A ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.051
- Cobalt #1E488F ΔE 0.052
- YInMn Blue #415A77 ΔE 0.053
Use #304B73 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.