#304D9E
Closest named color: Cobalt (#1E488F). oklch(44.4% 0.136 266.2), rgb(48, 77, 158).
Aa
White text reads best on this color (7.83:1).
About this color
#304D9E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.136 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.034 away. White text reads best on it, at 7.83:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.68:1 |
| White text | 7.83:1 |
Values
| HEX | #304D9E |
| RGB | rgb(48, 77, 158) |
| HSL | hsl(224, 53%, 40%) |
| OKLCH | oklch(44.4% 0.136 266.2) |
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 #304D9E | 7.83:1 | AAA | Lc -91.6 | Preferred for body text |
| Black text on #304D9E | 2.68:1 | Fails | Lc 17.2 | Dividers and decoration only |
| #304D9E text on white | 7.83:1 | AAA | Lc 86.9 | Fine for body text |
| #304D9E text on black | 2.68:1 | Fails | Lc -15.2 | 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
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#A9C0F5
oklch(80.9% 0.079 266.4)
-
Step 400
400
#7B9EF0
oklch(70.8% 0.127 265.7)
-
Step 500
500
#5B83EB
oklch(63.2% 0.162 266.1)
-
Step 600
600
#426AD9
oklch(55.6% 0.176 265.9)
-
Step 700
700
#3557BC
oklch(49% 0.164 266.3)
-
Step 800
800 (this color)
#304D9E
oklch(44.4% 0.136 266.2)
-
Step 900
900
#273D79
oklch(37.6% 0.106 266.3)
-
Step 950
950
#172447
oklch(26.9% 0.068 266.6)
#304D9E 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) | #1D57A1 | 0.029 |
| Deuteranopia (no green cones) | #004D9C | 0.031 |
| Tritanopia (no blue cones) | #00606E | 0.111 |
| Achromatopsia (no color) | #525252 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304D9E
#304D9E
oklch(44.4% 0.136 266.2)
- #6A4F00
#6A4F00
oklch(44.4% 0.091 85.8)
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 #304D9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.034
- Dusk Blue #26538D ΔE 0.036
- Blueberry #464196 ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.050
- Light Navy #155084 ΔE 0.051
- Twilight #4E518B ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.056
Use #304D9E 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.