#304B71
Closest named color: Light Navy (#155084). oklch(41% 0.072 257.1), rgb(48, 75, 113).
Aa
White text reads best on this color (8.85:1).
About this color
#304B71 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.072 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy (#155084), ΔE 0.037 away. White text reads best on it, at 8.85:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Light Navy (#155084) |
| Black text | 2.37:1 |
| White text | 8.85:1 |
Values
| HEX | #304B71 |
| RGB | rgb(48, 75, 113) |
| HSL | hsl(215, 40%, 32%) |
| OKLCH | oklch(41% 0.072 257.1) |
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 #304B71 | 8.85:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #304B71 | 2.37:1 | Fails | Lc 13.8 | Not readable |
| #304B71 text on white | 8.85:1 | AAA | Lc 90.2 | Preferred for body text |
| #304B71 text on black | 2.37:1 | Fails | Lc -12.1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D0DAE9
oklch(88.5% 0.023 258.4)
-
Step 300
300
#B0C2DC
oklch(80.9% 0.042 257.5)
-
Step 400
400
#86A3CB
oklch(70.8% 0.067 256.5)
-
Step 500
500
#688BBD
oklch(63.1% 0.086 257.3)
-
Step 600
600
#4F75AA
oklch(55.7% 0.094 256.9)
-
Step 700
700
#3F6292
oklch(49.2% 0.088 256.6)
-
Step 800
800 (this color)
#304B71
oklch(41% 0.072 257.1)
-
Step 900
900
#2E425F
oklch(37.6% 0.056 257.6)
-
Step 950
950
#1B2738
oklch(27% 0.036 257.1)
#304B71 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) | #3C4D73 | 0.018 |
| Deuteranopia (no green cones) | #344770 | 0.012 |
| Tritanopia (no blue cones) | #075359 | 0.063 |
| Achromatopsia (no color) | #4A4A4A | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B71
#304B71
oklch(41% 0.072 257.1)
- #604516
#604516
oklch(41.1% 0.072 77.8)
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 #304B71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy #155084 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.040
- Deep Sea Blue #015482 ΔE 0.041
- Twilight Blue #0A437A ΔE 0.047
- Dusk Blue #26538D ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.053
- YInMn Blue #415A77 ΔE 0.053
- Charcoal #264653 ΔE 0.054
Use #304B71 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.