#333966
Closest named color: Prussian Blue (#1D3557). oklch(36.2% 0.078 276.1), rgb(51, 57, 102).
Aa
White text reads best on this color (10.94:1).
About this color
#333966 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.078 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.043 away. White text reads best on it, at 10.94:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.91:1 |
| White text | 10.94:1 |
Values
| HEX | #333966 |
| RGB | rgb(51, 57, 102) |
| HSL | hsl(233, 33%, 30%) |
| OKLCH | oklch(36.2% 0.078 276.1) |
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 #333966 | 10.94:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #333966 | 1.91:1 | Fails | Lc 8.7 | Not readable |
| #333966 text on white | 10.94:1 | AAA | Lc 95.2 | Preferred for body text |
| #333966 text on black | 1.91:1 | Fails | Lc -7.4 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D3D8EF
oklch(88.5% 0.032 276)
-
Step 300
300
#B6BEE7
oklch(80.9% 0.059 276.4)
-
Step 400
400
#919CDB
oklch(70.8% 0.093 276.1)
-
Step 500
500
#7682D1
oklch(63.1% 0.119 275.9)
-
Step 600
600
#606ABE
oklch(55.6% 0.13 276.2)
-
Step 700
700
#4F58A4
oklch(49.1% 0.121 275.9)
-
Step 800
800
#414885
oklch(42.7% 0.101 276.3)
-
Step 900
900 (this color)
#333966
oklch(36.2% 0.078 276.1)
-
Step 950
950
#20243E
oklch(27% 0.049 276)
#333966 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) | #283F68 | 0.021 |
| Deuteranopia (no green cones) | #233B65 | 0.022 |
| Tritanopia (no blue cones) | #20424A | 0.068 |
| Achromatopsia (no color) | #3C3C3C | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333966
#333966
oklch(36.2% 0.078 276.1)
- #493D00
#493D00
oklch(36.2% 0.075 96.6)
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 #333966, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.043
- Marine Blue #01386A ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.050
- Twilight Blue #0A437A ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.055
- Charcoal #264653 ΔE 0.061
- Marine #042E60 ΔE 0.067
- Gunmetal #293241 ΔE 0.068
Use #333966 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.