#304AA0
Closest named color: Cobalt (#1E488F). oklch(43.9% 0.143 267.5), rgb(48, 74, 160).
Aa
White text reads best on this color (8.03:1).
About this color
#304AA0 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.143 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.035 away. White text reads best on it, at 8.03:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.61:1 |
| White text | 8.03:1 |
Values
| HEX | #304AA0 |
| RGB | rgb(48, 74, 160) |
| HSL | hsl(226, 54%, 41%) |
| OKLCH | oklch(43.9% 0.143 267.5) |
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 #304AA0 | 8.03:1 | AAA | Lc -92.2 | Preferred for body text |
| Black text on #304AA0 | 2.61:1 | Fails | Lc 16.5 | Dividers and decoration only |
| #304AA0 text on white | 8.03:1 | AAA | Lc 87.5 | Fine for body text |
| #304AA0 text on black | 2.61:1 | Fails | Lc -14.7 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#A9BFF8
oklch(80.8% 0.085 268.1)
-
Step 400
400
#7C9CF4
oklch(70.6% 0.134 267.8)
-
Step 500
500
#5C81F0
oklch(63.1% 0.171 267.5)
-
Step 600
600
#4467DE
oklch(55.5% 0.186 267.6)
-
Step 700
700
#3655C1
oklch(49.1% 0.173 267.5)
-
Step 800
800 (this color)
#304AA0
oklch(43.9% 0.143 267.5)
-
Step 900
900
#283C7C
oklch(37.7% 0.111 267.7)
-
Step 950
950
#172449
oklch(27.1% 0.071 267.1)
#304AA0 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) | #0E56A3 | 0.036 |
| Deuteranopia (no green cones) | #004B9E | 0.031 |
| Tritanopia (no blue cones) | #005F6D | 0.118 |
| Achromatopsia (no color) | #505050 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304AA0
#304AA0
oklch(43.9% 0.143 267.5)
- #674E00
#674E00
oklch(43.8% 0.09 87.3)
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 #304AA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.035
- Blueberry #464196 ΔE 0.037
- Dusk Blue #26538D ΔE 0.043
- Sapphire #2138AB ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.053
- Light Navy #155084 ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.059
- Twilight #4E518B ΔE 0.059
Use #304AA0 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.