#333378
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.115 279), rgb(51, 51, 120).
Aa
White text reads best on this color (11.13:1).
About this color
#333378 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.115 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.054 away. White text reads best on it, at 11.13:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.88:1 |
| White text | 11.13:1 |
Values
| HEX | #333378 |
| RGB | rgb(51, 51, 120) |
| HSL | hsl(240, 40%, 34%) |
| OKLCH | oklch(36.2% 0.115 279) |
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 #333378 | 11.13:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #333378 | 1.88:1 | Fails | Lc 8.4 | Not readable |
| #333378 text on white | 11.13:1 | AAA | Lc 95.5 | Preferred for body text |
| #333378 text on black | 1.88:1 | Fails | Lc 0.0 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9FB
oklch(93.7% 0.024 278.4)
-
Step 200
200
#D2D7F9
oklch(88.6% 0.047 278.8)
-
Step 300
300
#B4BBF8
oklch(80.8% 0.086 279.2)
-
Step 400
400
#8F96F5
oklch(70.8% 0.138 279)
-
Step 500
500
#7679F1
oklch(63.3% 0.176 279)
-
Step 600
600
#605EDF
oklch(55.6% 0.191 278.9)
-
Step 700
700
#504CC2
oklch(49.1% 0.179 279)
-
Step 800
800
#413F9D
oklch(42.6% 0.149 279)
-
Step 900
900 (this color)
#333378
oklch(36.2% 0.115 279)
-
Step 950
950
#202149
oklch(27.1% 0.073 279.3)
#333378 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) | #053E7A | 0.048 |
| Deuteranopia (no green cones) | #003977 | 0.048 |
| Tritanopia (no blue cones) | #114350 | 0.100 |
| Achromatopsia (no color) | #3B3B3B | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333378
#333378
oklch(36.2% 0.115 279)
- #483E00
#483E00
oklch(36.3% 0.075 99)
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 #333378, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.055
- Marine Blue #01386A ΔE 0.056
- Cobalt #1E488F ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.067
- Blueberry #464196 ΔE 0.069
- Marine #042E60 ΔE 0.072
- Midnight Blue #191970 ΔE 0.081
Use #333378 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.