#304A91
Closest named color: Cobalt (#1E488F). oklch(42.8% 0.121 266.3), rgb(48, 74, 145).
Aa
White text reads best on this color (8.35:1).
About this color
#304A91 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.121 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.020 away. White text reads best on it, at 8.35:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.51:1 |
| White text | 8.35:1 |
Values
| HEX | #304A91 |
| RGB | rgb(48, 74, 145) |
| HSL | hsl(224, 50%, 38%) |
| OKLCH | oklch(42.8% 0.121 266.3) |
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 #304A91 | 8.35:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #304A91 | 2.51:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #304A91 text on white | 8.35:1 | AAA | Lc 88.5 | Fine for body text |
| #304A91 text on black | 2.51:1 | Fails | Lc -13.6 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F4
oklch(88.5% 0.039 266.5)
-
Step 300
300
#ABC0EF
oklch(80.8% 0.071 266)
-
Step 400
400
#809EE8
oklch(70.7% 0.114 266.7)
-
Step 500
500
#6084E1
oklch(63% 0.146 266.3)
-
Step 600
600
#486CCE
oklch(55.6% 0.157 266.2)
-
Step 700
700
#3A5AB3
oklch(49.2% 0.146 266.3)
-
Step 800
800 (this color)
#304A91
oklch(42.8% 0.121 266.3)
-
Step 900
900
#2A3E73
oklch(37.6% 0.094 266.4)
-
Step 950
950
#192544
oklch(27.1% 0.06 266.5)
#304A91 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) | #255294 | 0.023 |
| Deuteranopia (no green cones) | #104A90 | 0.027 |
| Tritanopia (no blue cones) | #005A66 | 0.101 |
| Achromatopsia (no color) | #4E4E4E | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304A91
#304A91
oklch(42.8% 0.121 266.3)
- #644B00
#644B00
oklch(42.8% 0.087 86.6)
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 #304A91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.020
- Dusk Blue #26538D ΔE 0.028
- Light Navy #155084 ΔE 0.037
- Blueberry #464196 ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.045
- Twilight #4E518B ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.051
Use #304A91 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.