#304F83
Closest named color: Dusk Blue (#26538D). oklch(43% 0.094 260.2), rgb(48, 79, 131).
Aa
White text reads best on this color (8.16:1).
About this color
#304F83 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.094 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.019 away. White text reads best on it, at 8.16:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.57:1 |
| White text | 8.16:1 |
Values
| HEX | #304F83 |
| RGB | rgb(48, 79, 131) |
| HSL | hsl(218, 46%, 35%) |
| OKLCH | oklch(43% 0.094 260.2) |
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 #304F83 | 8.16:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #304F83 | 2.57:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #304F83 text on white | 8.16:1 | AAA | Lc 88.1 | Fine for body text |
| #304F83 text on black | 2.57:1 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEE
oklch(88.5% 0.03 260.7)
-
Step 300
300
#ACC2E5
oklch(80.9% 0.055 259.6)
-
Step 400
400
#81A2D8
oklch(70.8% 0.088 260.1)
-
Step 500
500
#6189CD
oklch(63% 0.112 260.6)
-
Step 600
600
#4772BA
oklch(55.5% 0.122 260.2)
-
Step 700
700
#395FA0
oklch(49% 0.113 260.5)
-
Step 800
800 (this color)
#304F83
oklch(43% 0.094 260.2)
-
Step 900
900
#2A4168
oklch(37.6% 0.073 260.4)
-
Step 950
950
#19263D
oklch(26.9% 0.047 261.3)
#304F83 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) | #395385 | 0.017 |
| Deuteranopia (no green cones) | #2D4C82 | 0.010 |
| Tritanopia (no blue cones) | #005B62 | 0.081 |
| Achromatopsia (no color) | #4F4F4F | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304F83
#304F83
oklch(43% 0.094 260.2)
- #694900
#694900
oklch(43% 0.089 79.8)
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 #304F83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.019
- Light Navy #155084 ΔE 0.022
- Deep Sea Blue #015482 ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.032
- Cobalt #1E488F ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.043
- Twilight #4E518B ΔE 0.044
- Dusk #4E5481 ΔE 0.044
Use #304F83 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.