#304664
Closest named color: Dark Grey Blue (#29465B). oklch(39% 0.058 256.4), rgb(48, 70, 100).
Aa
White text reads best on this color (9.60:1).
About this color
#304664 is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.058 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.019 away. White text reads best on it, at 9.60:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.18:1 |
| White text | 9.60:1 |
Values
| HEX | #304664 |
| RGB | rgb(48, 70, 100) |
| HSL | hsl(215, 35%, 29%) |
| OKLCH | oklch(39% 0.058 256.4) |
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 #304664 | 9.60:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #304664 | 2.18:1 | Fails | Lc 11.8 | Not readable |
| #304664 text on white | 9.60:1 | AAA | Lc 92.2 | Preferred for body text |
| #304664 text on black | 2.18:1 | Fails | Lc -10.2 | 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 900.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EAF2
oklch(93.5% 0.013 255.5)
-
Step 200
200
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AFC2DD
oklch(80.8% 0.044 257.1)
-
Step 400
400
#84A3CC
oklch(70.7% 0.07 255.6)
-
Step 500
500
#658BBF
oklch(63% 0.09 256.4)
-
Step 600
600
#4C75AC
oklch(55.7% 0.098 256.1)
-
Step 700
700
#3D6293
oklch(49.1% 0.09 255.9)
-
Step 800
800
#335077
oklch(42.7% 0.074 256.2)
-
Step 900
900 (this color)
#304664
oklch(39% 0.058 256.4)
-
Step 950
950
#1A2738
oklch(26.9% 0.037 255.4)
#304664 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) | #3A4865 | 0.016 |
| Deuteranopia (no green cones) | #344363 | 0.010 |
| Tritanopia (no blue cones) | #194D50 | 0.053 |
| Achromatopsia (no color) | #454545 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304664
#304664
oklch(39% 0.058 256.4)
- #57411E
#57411E
oklch(39.1% 0.059 77.2)
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 #304664, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.019
- Charcoal #264653 ΔE 0.033
- Twilight Blue #0A437A ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.055
- Charcoal Grey #3C4142 ΔE 0.057
- Light Navy #155084 ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.061
Use #304664 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.