#304166
Closest named color: Dark Grey Blue (#29465B). oklch(37.9% 0.067 264.6), rgb(48, 65, 102).
Aa
White text reads best on this color (10.12:1).
About this color
#304166 is a dark, muted blue. In OKLCH its lightness is 38%, its chroma 0.067 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.029 away. White text reads best on it, at 10.12:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.07:1 |
| White text | 10.12:1 |
Values
| HEX | #304166 |
| RGB | rgb(48, 65, 102) |
| HSL | hsl(221, 36%, 29%) |
| OKLCH | oklch(37.9% 0.067 264.6) |
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 #304166 | 10.12:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #304166 | 2.07:1 | Fails | Lc 10.5 | Not readable |
| #304166 text on white | 10.12:1 | AAA | Lc 93.4 | Preferred for body text |
| #304166 text on black | 2.07:1 | Fails | Lc -9.1 | 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
#D0D9EC
oklch(88.4% 0.028 265.4)
-
Step 300
300
#B1C1E2
oklch(81% 0.05 264.8)
-
Step 400
400
#88A0D4
oklch(70.7% 0.081 265.2)
-
Step 500
500
#6A88C8
oklch(63.1% 0.103 264.5)
-
Step 600
600
#5271B5
oklch(55.6% 0.112 264.5)
-
Step 700
700
#435E9C
oklch(49.1% 0.105 265)
-
Step 800
800
#374D7E
oklch(42.6% 0.086 264.7)
-
Step 900
900 (this color)
#304166
oklch(37.9% 0.067 264.6)
-
Step 950
950
#1C263B
oklch(27% 0.042 264.3)
#304166 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) | #334468 | 0.011 |
| Deuteranopia (no green cones) | #2D3F65 | 0.008 |
| Tritanopia (no blue cones) | #18494E | 0.061 |
| Achromatopsia (no color) | #424242 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304166
#304166
oklch(37.9% 0.067 264.6)
- #533F10
#533F10
oklch(38% 0.068 84.7)
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 #304166, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.029
- Charcoal #264653 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.052
- Marine Blue #01386A ΔE 0.055
- Light Navy #155084 ΔE 0.061
- Charcoal Grey #3C4142 ΔE 0.064
Use #304166 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.