#304369
Closest named color: Dark Grey Blue (#29465B). oklch(38.5% 0.07 263.3), rgb(48, 67, 105).
Aa
White text reads best on this color (9.84:1).
About this color
#304369 is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.070 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.030 away. White text reads best on it, at 9.84:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.13:1 |
| White text | 9.84:1 |
Values
| HEX | #304369 |
| RGB | rgb(48, 67, 105) |
| HSL | hsl(220, 37%, 30%) |
| OKLCH | oklch(38.5% 0.07 263.3) |
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 #304369 | 9.84:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #304369 | 2.13:1 | Fails | Lc 11.2 | Not readable |
| #304369 text on white | 9.84:1 | AAA | Lc 92.7 | Preferred for body text |
| #304369 text on black | 2.13:1 | Fails | Lc -9.7 | 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 900.
-
Step 50
50
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#CFDAED
oklch(88.6% 0.029 261.5)
-
Step 300
300
#AFC1E3
oklch(80.9% 0.052 263.1)
-
Step 400
400
#85A1D5
oklch(70.7% 0.083 262.5)
-
Step 500
500
#6788CA
oklch(63% 0.107 263.4)
-
Step 600
600
#4F71B7
oklch(55.6% 0.116 263.5)
-
Step 700
700
#405F9E
oklch(49.2% 0.108 263.2)
-
Step 800
800
#354D80
oklch(42.6% 0.09 263.9)
-
Step 900
900 (this color)
#304369
oklch(38.5% 0.07 263.3)
-
Step 950
950
#1B263C
oklch(27% 0.044 263.4)
#304369 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) | #34466B | 0.011 |
| Deuteranopia (no green cones) | #2E4168 | 0.007 |
| Tritanopia (no blue cones) | #154B51 | 0.062 |
| Achromatopsia (no color) | #434343 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304369
#304369
oklch(38.5% 0.07 263.3)
- #564010
#564010
oklch(38.6% 0.07 82.9)
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 #304369, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.030
- Twilight Blue #0A437A ΔE 0.042
- Charcoal #264653 ΔE 0.045
- Light Navy #155084 ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.058
- Marine Blue #01386A ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.061
Use #304369 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.