#304DA0
Closest named color: Cobalt (#1E488F). oklch(44.6% 0.139 266.3), rgb(48, 77, 160).
Aa
White text reads best on this color (7.79:1).
About this color
#304DA0 is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.139 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.037 away. White text reads best on it, at 7.79:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.69:1 |
| White text | 7.79:1 |
Values
| HEX | #304DA0 |
| RGB | rgb(48, 77, 160) |
| HSL | hsl(224, 54%, 41%) |
| OKLCH | oklch(44.6% 0.139 266.3) |
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 #304DA0 | 7.79:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #304DA0 | 2.69:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #304DA0 text on white | 7.79:1 | AAA | Lc 86.7 | Fine for body text |
| #304DA0 text on black | 2.69:1 | Fails | Lc -15.4 | Dividers and decoration only |
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
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CBD9F8
oklch(88.5% 0.045 266.2)
-
Step 300
300
#A8C0F6
oklch(80.9% 0.081 266)
-
Step 400
400
#7B9DF2
oklch(70.7% 0.131 266.6)
-
Step 500
500
#5A82ED
oklch(63% 0.167 266.3)
-
Step 600
600
#4269DB
oklch(55.6% 0.18 266.3)
-
Step 700
700
#3457BE
oklch(49.1% 0.167 266.2)
-
Step 800
800 (this color)
#304DA0
oklch(44.6% 0.139 266.3)
-
Step 900
900
#273D7A
oklch(37.7% 0.107 266.4)
-
Step 950
950
#172448
oklch(27% 0.069 266.8)
#304DA0 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) | #1A58A3 | 0.031 |
| Deuteranopia (no green cones) | #004D9E | 0.031 |
| Tritanopia (no blue cones) | #00616F | 0.113 |
| Achromatopsia (no color) | #525252 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304DA0
#304DA0
oklch(44.6% 0.139 266.3)
- #6A5000
#6A5000
oklch(44.6% 0.091 86.9)
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 #304DA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.037
- Dusk Blue #26538D ΔE 0.039
- Blueberry #464196 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.051
- Light Navy #155084 ΔE 0.054
- Twilight #4E518B ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.057
- Light Navy Blue #2E5A88 ΔE 0.058
Use #304DA0 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.