#333780
Closest named color: Dark Slate Blue (#483D8B). oklch(37.7% 0.121 276.5), rgb(51, 55, 128).
Aa
White text reads best on this color (10.50:1).
About this color
#333780 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.121 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.043 away. White text reads best on it, at 10.50:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.99:1 |
| White text | 10.50:1 |
Values
| HEX | #333780 |
| RGB | rgb(51, 55, 128) |
| HSL | hsl(237, 43%, 35%) |
| OKLCH | oklch(37.7% 0.121 276.5) |
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 #333780 | 10.50:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #333780 | 1.99:1 | Fails | Lc 9.8 | Not readable |
| #333780 text on white | 10.50:1 | AAA | Lc 94.1 | Preferred for body text |
| #333780 text on black | 1.99:1 | Fails | Lc -8.5 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D0D7FB
oklch(88.5% 0.05 276.6)
-
Step 300
300
#B1BCFB
oklch(80.9% 0.09 276.5)
-
Step 400
400
#8A96FA
oklch(70.7% 0.146 276.8)
-
Step 500
500
#6F79F7
oklch(63.2% 0.185 276.3)
-
Step 600
600
#5A5DE6
oklch(55.5% 0.203 276.6)
-
Step 700
700
#4B4CC8
oklch(49.2% 0.188 276.6)
-
Step 800
800
#3D3FA1
oklch(42.7% 0.155 276.7)
-
Step 900
900 (this color)
#333780
oklch(37.7% 0.121 276.5)
-
Step 950
950
#1E214B
oklch(27.1% 0.077 276.9)
#333780 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) | #034283 | 0.046 |
| Deuteranopia (no green cones) | #003C7E | 0.045 |
| Tritanopia (no blue cones) | #004856 | 0.105 |
| Achromatopsia (no color) | #3F3F3F | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333780
#333780
oklch(37.7% 0.121 276.5)
- #4E4100
#4E4100
oklch(37.8% 0.078 96.2)
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 #333780, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.043
- Twilight Blue #0A437A ΔE 0.049
- Cobalt #1E488F ΔE 0.051
- Blueberry #464196 ΔE 0.055
- Marine Blue #01386A ΔE 0.063
- Light Navy #155084 ΔE 0.071
- Sapphire #2138AB ΔE 0.074
- Dusk Blue #26538D ΔE 0.078
Use #333780 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.