#304B68
Closest named color: Dark Grey Blue (#29465B). oklch(40.5% 0.059 251.1), rgb(48, 75, 104).
Aa
White text reads best on this color (9.00:1).
About this color
#304B68 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.059 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.027 away. White text reads best on it, at 9.00:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.33:1 |
| White text | 9.00:1 |
Values
| HEX | #304B68 |
| RGB | rgb(48, 75, 104) |
| HSL | hsl(211, 37%, 30%) |
| OKLCH | oklch(40.5% 0.059 251.1) |
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 #304B68 | 9.00:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #304B68 | 2.33:1 | Fails | Lc 13.4 | Not readable |
| #304B68 text on white | 9.00:1 | AAA | Lc 90.6 | Preferred for body text |
| #304B68 text on black | 2.33:1 | Fails | Lc -11.7 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EAF0
oklch(93.5% 0.01 252.8)
-
Step 200
200
#D0DAE6
oklch(88.4% 0.02 252.9)
-
Step 300
300
#B1C3D7
oklch(81% 0.035 251)
-
Step 400
400
#87A4C3
oklch(70.8% 0.056 250.3)
-
Step 500
500
#698DB3
oklch(63.1% 0.07 250.3)
-
Step 600
600
#51769F
oklch(55.5% 0.077 251.8)
-
Step 700
700
#416388
oklch(49% 0.072 251.4)
-
Step 800
800 (this color)
#304B68
oklch(40.5% 0.059 251.1)
-
Step 900
900
#2F4359
oklch(37.6% 0.046 251.4)
-
Step 950
950
#1C2834
oklch(27.1% 0.028 248.9)
#304B68 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) | #3F4C69 | 0.021 |
| Deuteranopia (no green cones) | #384767 | 0.015 |
| Tritanopia (no blue cones) | #145255 | 0.052 |
| Achromatopsia (no color) | #494949 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B68
#304B68
oklch(40.5% 0.059 251.1)
- #5D4323
#5D4323
oklch(40.4% 0.059 70.5)
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 #304B68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.027
- Charcoal #264653 ΔE 0.040
- Light Navy #155084 ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.050
- Twilight Blue #0A437A ΔE 0.055
- Deep Teal #00555A ΔE 0.055
- YInMn Blue #415A77 ΔE 0.055
Use #304B68 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.