#304D8B
Closest named color: Dusk Blue (#26538D). oklch(43.1% 0.108 263.6), rgb(48, 77, 139).
Aa
White text reads best on this color (8.20:1).
About this color
#304D8B is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.108 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.018 away. White text reads best on it, at 8.20:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.56:1 |
| White text | 8.20:1 |
Values
| HEX | #304D8B |
| RGB | rgb(48, 77, 139) |
| HSL | hsl(221, 49%, 37%) |
| OKLCH | oklch(43.1% 0.108 263.6) |
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 #304D8B | 8.20:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #304D8B | 2.56:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #304D8B text on white | 8.20:1 | AAA | Lc 88.1 | Fine for body text |
| #304D8B text on black | 2.56:1 | Fails | Lc -14.0 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#ACC1EA
oklch(80.9% 0.063 263.7)
-
Step 400
400
#80A0E0
oklch(70.7% 0.101 263.6)
-
Step 500
500
#6087D8
oklch(63.1% 0.13 263.6)
-
Step 600
600
#476FC5
oklch(55.6% 0.141 263.7)
-
Step 700
700
#395DAA
oklch(49.2% 0.13 263.5)
-
Step 800
800 (this color)
#304D8B
oklch(43.1% 0.108 263.6)
-
Step 900
900
#2A406E
oklch(37.8% 0.084 263.6)
-
Step 950
950
#192641
oklch(27.2% 0.054 263.7)
#304D8B 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) | #30538D | 0.017 |
| Deuteranopia (no green cones) | #224B8A | 0.016 |
| Tritanopia (no blue cones) | #005B65 | 0.091 |
| Achromatopsia (no color) | #4F4F4F | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304D8B
#304D8B
oklch(43.1% 0.108 263.6)
- #674B00
#674B00
oklch(43.1% 0.089 83.9)
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 #304D8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.018
- Cobalt #1E488F ΔE 0.026
- Light Navy #155084 ΔE 0.027
- Deep Sea Blue #015482 ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.040
- Twilight #4E518B ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.044
- Blueberry #464196 ΔE 0.046
Use #304D8B 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.