#333390
Closest named color: Dark Slate Blue (#483D8B). oklch(38.3% 0.149 276.7), rgb(51, 51, 144).
Aa
White text reads best on this color (10.41:1).
About this color
#333390 is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.149 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.046 away. White text reads best on it, at 10.41:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.01:1 |
| White text | 10.41:1 |
Values
| HEX | #333390 |
| RGB | rgb(51, 51, 144) |
| HSL | hsl(240, 48%, 38%) |
| OKLCH | oklch(38.3% 0.149 276.7) |
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 #333390 | 10.41:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #333390 | 2.01:1 | Fails | Lc 10.3 | Not readable |
| #333390 text on white | 10.41:1 | AAA | Lc 93.7 | Preferred for body text |
| #333390 text on black | 2.01:1 | Fails | Lc -8.8 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FF
oklch(93.7% 0.03 275.6)
-
Step 200
200
#CFD7FF
oklch(88.6% 0.056 276.3)
-
Step 300
300
#B0BBFF
oklch(80.8% 0.097 276.9)
-
Step 400
400
#8995FF
oklch(70.7% 0.154 276.8)
-
Step 500
500
#6E76FF
oklch(63.1% 0.2 276.5)
-
Step 600
600
#5951FF
oklch(55.7% 0.247 276.7)
-
Step 700
700
#4A3FDF
oklch(49.2% 0.231 276.7)
-
Step 800
800
#3C36B4
oklch(42.8% 0.191 276.7)
-
Step 900
900 (this color)
#333390
oklch(38.3% 0.149 276.7)
-
Step 950
950
#1D1E53
oklch(27% 0.094 277.2)
#333390 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) | #004493 | 0.053 |
| Deuteranopia (no green cones) | #003C8E | 0.046 |
| Tritanopia (no blue cones) | #004A5C | 0.124 |
| Achromatopsia (no color) | #404040 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333390
#333390
oklch(38.3% 0.149 276.7)
- #4F4300
#4F4300
oklch(38.4% 0.079 97.6)
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 #333390, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.046
- Blueberry #464196 ΔE 0.049
- Sapphire #2138AB ΔE 0.050
- Cobalt #1E488F ΔE 0.055
- Indigo Blue #3A18B1 ΔE 0.066
- Twilight Blue #0A437A ΔE 0.067
- Imperial Purple #480CA8 ΔE 0.070
- Royal #0C1793 ΔE 0.080
Use #333390 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.