#304B93
Closest named color: Cobalt (#1E488F). oklch(43.2% 0.123 266), rgb(48, 75, 147).
Aa
White text reads best on this color (8.22:1).
About this color
#304B93 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.123 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.022 away. White text reads best on it, at 8.22:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.55:1 |
| White text | 8.22:1 |
Values
| HEX | #304B93 |
| RGB | rgb(48, 75, 147) |
| HSL | hsl(224, 51%, 38%) |
| OKLCH | oklch(43.2% 0.123 266) |
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 #304B93 | 8.22:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #304B93 | 2.55:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #304B93 text on white | 8.22:1 | AAA | Lc 88.1 | Fine for body text |
| #304B93 text on black | 2.55:1 | Fails | Lc -14.0 | 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
#ABC0F0
oklch(80.9% 0.072 266.3)
-
Step 400
400
#7F9EE9
oklch(70.7% 0.116 266.4)
-
Step 500
500
#5F84E2
oklch(63% 0.148 266.1)
-
Step 600
600
#476CD0
oklch(55.7% 0.16 266.1)
-
Step 700
700
#3859B4
oklch(49% 0.149 266)
-
Step 800
800 (this color)
#304B93
oklch(43.2% 0.123 266)
-
Step 900
900
#293E74
oklch(37.6% 0.096 266)
-
Step 950
950
#182544
oklch(27% 0.061 265.4)
#304B93 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) | #255496 | 0.025 |
| Deuteranopia (no green cones) | #0F4B92 | 0.027 |
| Tritanopia (no blue cones) | #005C68 | 0.102 |
| Achromatopsia (no color) | #4F4F4F | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B93
#304B93
oklch(43.2% 0.123 266)
- #664C00
#664C00
oklch(43.2% 0.089 85.9)
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 #304B93, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.022
- Dusk Blue #26538D ΔE 0.027
- Blueberry #464196 ΔE 0.037
- Light Navy #155084 ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.047
- Twilight #4E518B ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.050
Use #304B93 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.