#333379
Closest named color: Dark Slate Blue (#483D8B). oklch(36.3% 0.116 278.9), rgb(51, 51, 121).
Aa
White text reads best on this color (11.10:1).
About this color
#333379 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.116 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.054 away. White text reads best on it, at 11.10:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.89:1 |
| White text | 11.10:1 |
Values
| HEX | #333379 |
| RGB | rgb(51, 51, 121) |
| HSL | hsl(240, 41%, 34%) |
| OKLCH | oklch(36.3% 0.116 278.9) |
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 #333379 | 11.10:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #333379 | 1.89:1 | Fails | Lc 8.5 | Not readable |
| #333379 text on white | 11.10:1 | AAA | Lc 95.4 | Preferred for body text |
| #333379 text on black | 1.89:1 | 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
#D2D7FA
oklch(88.6% 0.048 278.9)
-
Step 300
300
#B4BBF9
oklch(80.9% 0.088 279.2)
-
Step 400
400
#8E96F6
oklch(70.7% 0.14 278.6)
-
Step 500
500
#7578F2
oklch(63.1% 0.179 278.9)
-
Step 600
600
#605DE1
oklch(55.6% 0.195 279)
-
Step 700
700
#504CC3
oklch(49.1% 0.18 278.9)
-
Step 800
800
#413F9E
oklch(42.7% 0.15 278.9)
-
Step 900
900 (this color)
#333379
oklch(36.3% 0.116 278.9)
-
Step 950
950
#202149
oklch(27.1% 0.073 279.3)
#333379 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) | #023E7B | 0.049 |
| Deuteranopia (no green cones) | #003978 | 0.048 |
| Tritanopia (no blue cones) | #0F4350 | 0.101 |
| Achromatopsia (no color) | #3C3C3C | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333379
#333379
oklch(36.3% 0.116 278.9)
- #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 #333379, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.054
- Twilight Blue #0A437A ΔE 0.054
- Marine Blue #01386A ΔE 0.057
- Cobalt #1E488F ΔE 0.065
- Blueberry #464196 ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.069
- Marine #042E60 ΔE 0.073
- Midnight Blue #191970 ΔE 0.081
Use #333379 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.