#304580
Closest named color: Cobalt (#1E488F). oklch(40.5% 0.102 267), rgb(48, 69, 128).
Aa
White text reads best on this color (9.17:1).
About this color
#304580 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.102 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.029 away. White text reads best on it, at 9.17:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.28:1 |
| White text | 9.17:1 |
Values
| HEX | #304580 |
| RGB | rgb(48, 69, 128) |
| HSL | hsl(224, 45%, 35%) |
| OKLCH | oklch(40.5% 0.102 267) |
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 #304580 | 9.17:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #304580 | 2.28:1 | Fails | Lc 13.0 | Not readable |
| #304580 text on white | 9.17:1 | AAA | Lc 90.9 | Preferred for body text |
| #304580 text on black | 2.28:1 | Fails | Lc -11.4 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#CFD9F0
oklch(88.5% 0.033 266.9)
-
Step 300
300
#AFC0E8
oklch(80.8% 0.06 267)
-
Step 400
400
#869FDD
oklch(70.8% 0.096 267.1)
-
Step 500
500
#6886D4
oklch(63.2% 0.123 267)
-
Step 600
600
#506EC1
oklch(55.6% 0.134 267.1)
-
Step 700
700
#415CA6
oklch(49.1% 0.123 266.8)
-
Step 800
800 (this color)
#304580
oklch(40.5% 0.102 267)
-
Step 900
900
#2E3F6C
oklch(37.6% 0.08 266.9)
-
Step 950
950
#1B253F
oklch(26.9% 0.051 267)
#304580 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) | #2A4C82 | 0.020 |
| Deuteranopia (no green cones) | #1E447F | 0.020 |
| Tritanopia (no blue cones) | #00525C | 0.088 |
| Achromatopsia (no color) | #484848 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304580
#304580
oklch(40.5% 0.102 267)
- #5C4500
#5C4500
oklch(40.4% 0.083 86.9)
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 #304580, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.029
- Light Navy #155084 ΔE 0.036
- Twilight Blue #0A437A ΔE 0.036
- Dusk Blue #26538D ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.049
- Blueberry #464196 ΔE 0.050
- Twilight #4E518B ΔE 0.060
Use #304580 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.