#304191
Closest named color: Cobalt (#1E488F). oklch(40.9% 0.133 270.4), rgb(48, 65, 145).
Aa
White text reads best on this color (9.16:1).
About this color
#304191 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.133 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.024 away. White text reads best on it, at 9.16:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.29:1 |
| White text | 9.16:1 |
Values
| HEX | #304191 |
| RGB | rgb(48, 65, 145) |
| HSL | hsl(229, 50%, 38%) |
| OKLCH | oklch(40.9% 0.133 270.4) |
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 #304191 | 9.16:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #304191 | 2.29:1 | Fails | Lc 13.2 | Not readable |
| #304191 text on white | 9.16:1 | AAA | Lc 90.8 | Preferred for body text |
| #304191 text on black | 2.29:1 | Fails | Lc -11.5 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F7
oklch(88.4% 0.044 271.3)
-
Step 300
300
#ADBFF4
oklch(81% 0.078 270)
-
Step 400
400
#839CEE
oklch(70.8% 0.124 270.1)
-
Step 500
500
#6681E9
oklch(63.2% 0.159 270.4)
-
Step 600
600
#4E67D7
oklch(55.5% 0.174 270.4)
-
Step 700
700
#4055BA
oklch(49% 0.16 270.5)
-
Step 800
800 (this color)
#304191
oklch(40.9% 0.133 270.4)
-
Step 900
900
#2D3C78
oklch(37.7% 0.104 270.2)
-
Step 950
950
#1A2446
oklch(27.1% 0.065 269.4)
#304191 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) | #074C94 | 0.038 |
| Deuteranopia (no green cones) | #00448F | 0.035 |
| Tritanopia (no blue cones) | #005462 | 0.111 |
| Achromatopsia (no color) | #484848 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304191
#304191
oklch(40.9% 0.133 270.4)
- #5B4700
#5B4700
oklch(40.7% 0.083 90.3)
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 #304191, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Blueberry #464196 ΔE 0.033
- Dark Slate Blue #483D8B ΔE 0.036
- Dusk Blue #26538D ΔE 0.051
- Sapphire #2138AB ΔE 0.052
- Twilight Blue #0A437A ΔE 0.052
- Light Navy #155084 ΔE 0.053
- Deep Sea Blue #015482 ΔE 0.067
Use #304191 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.