#304585
Closest named color: Cobalt (#1E488F). oklch(40.8% 0.11 267.7), rgb(48, 69, 133).
Aa
White text reads best on this color (9.06:1).
About this color
#304585 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.110 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.023 away. White text reads best on it, at 9.06:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.31:1 |
| White text | 9.06:1 |
Values
| HEX | #304585 |
| RGB | rgb(48, 69, 133) |
| HSL | hsl(225, 47%, 35%) |
| OKLCH | oklch(40.8% 0.11 267.7) |
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 #304585 | 9.06:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #304585 | 2.31:1 | Fails | Lc 13.3 | Not readable |
| #304585 text on white | 9.06:1 | AAA | Lc 90.6 | Preferred for body text |
| #304585 text on black | 2.31:1 | Fails | Lc -11.7 | 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
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CFD9F2
oklch(88.5% 0.036 268.3)
-
Step 300
300
#AEC0EB
oklch(80.9% 0.064 267.2)
-
Step 400
400
#859EE1
oklch(70.7% 0.103 268.1)
-
Step 500
500
#6785D9
oklch(63.2% 0.131 267.7)
-
Step 600
600
#4F6DC6
oklch(55.6% 0.142 267.6)
-
Step 700
700
#405AAB
oklch(49% 0.133 267.9)
-
Step 800
800 (this color)
#304585
oklch(40.8% 0.11 267.7)
-
Step 900
900
#2E3F6F
oklch(37.8% 0.085 267.5)
-
Step 950
950
#1B2541
oklch(27% 0.054 267.8)
#304585 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) | #264D87 | 0.023 |
| Deuteranopia (no green cones) | #174584 | 0.025 |
| Tritanopia (no blue cones) | #00545E | 0.095 |
| Achromatopsia (no color) | #494949 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304585
#304585
oklch(40.8% 0.11 267.7)
- #5D4600
#5D4600
oklch(40.8% 0.083 87.1)
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 #304585, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.023
- Light Navy #155084 ΔE 0.037
- Twilight Blue #0A437A ΔE 0.040
- Dusk Blue #26538D ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.051
- Twilight #4E518B ΔE 0.058
Use #304585 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.