#304998
Closest named color: Cobalt (#1E488F). oklch(43.1% 0.133 267.4), rgb(48, 73, 152).
Aa
White text reads best on this color (8.29:1).
About this color
#304998 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.133 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.024 away. White text reads best on it, at 8.29:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.53:1 |
| White text | 8.29:1 |
Values
| HEX | #304998 |
| RGB | rgb(48, 73, 152) |
| HSL | hsl(226, 52%, 39%) |
| OKLCH | oklch(43.1% 0.133 267.4) |
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 #304998 | 8.29:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #304998 | 2.53:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #304998 text on white | 8.29:1 | AAA | Lc 88.3 | Fine for body text |
| #304998 text on black | 2.53:1 | Fails | Lc -13.9 | 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#AAC0F4
oklch(80.9% 0.078 266.8)
-
Step 400
400
#7E9DEE
oklch(70.6% 0.124 267.3)
-
Step 500
500
#5F82E9
oklch(63% 0.16 267.6)
-
Step 600
600
#4769D7
oklch(55.5% 0.173 267.5)
-
Step 700
700
#3957BA
oklch(49.1% 0.16 267.5)
-
Step 800
800 (this color)
#304998
oklch(43.1% 0.133 267.4)
-
Step 900
900
#293D78
oklch(37.7% 0.104 267.2)
-
Step 950
950
#182446
oklch(26.9% 0.065 267.3)
#304998 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) | #1A539B | 0.030 |
| Deuteranopia (no green cones) | #004A96 | 0.032 |
| Tritanopia (no blue cones) | #005C69 | 0.110 |
| Achromatopsia (no color) | #4E4E4E | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304998
#304998
oklch(43.1% 0.133 267.4)
- #654C00
#654C00
oklch(43.1% 0.088 86.8)
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 #304998, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Blueberry #464196 ΔE 0.034
- Dusk Blue #26538D ΔE 0.036
- Dark Slate Blue #483D8B ΔE 0.046
- Light Navy #155084 ΔE 0.047
- Twilight #4E518B ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.057
- Sapphire #2138AB ΔE 0.057
Use #304998 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.