#33318A
Closest named color: Dark Slate Blue (#483D8B). oklch(37.4% 0.144 277.9), rgb(51, 49, 138).
Aa
White text reads best on this color (10.78:1).
About this color
#33318A is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.144 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.049 away. White text reads best on it, at 10.78:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.94:1 |
| White text | 10.78:1 |
Values
| HEX | #33318A |
| RGB | rgb(51, 49, 138) |
| HSL | hsl(241, 48%, 37%) |
| OKLCH | oklch(37.4% 0.144 277.9) |
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 #33318A | 10.78:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #33318A | 1.94:1 | Fails | Lc 9.4 | Not readable |
| #33318A text on white | 10.78:1 | AAA | Lc 94.5 | Preferred for body text |
| #33318A text on black | 1.94:1 | Fails | Lc -8.1 | 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
#E4E8FF
oklch(93.5% 0.031 277.9)
-
Step 200
200
#D0D6FF
oklch(88.5% 0.057 278.6)
-
Step 300
300
#B1BBFF
oklch(80.9% 0.097 277.5)
-
Step 400
400
#8B94FF
oklch(70.6% 0.155 278)
-
Step 500
500
#7175FF
oklch(63.1% 0.201 277.7)
-
Step 600
600
#5C52FA
oklch(55.6% 0.24 277.8)
-
Step 700
700
#4D41DA
oklch(49.2% 0.222 277.9)
-
Step 800
800
#3E37B0
oklch(42.7% 0.185 277.7)
-
Step 900
900 (this color)
#33318A
oklch(37.4% 0.144 277.9)
-
Step 950
950
#1E1E51
oklch(26.9% 0.091 278.4)
#33318A 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) | #00418D | 0.053 |
| Deuteranopia (no green cones) | #003A88 | 0.048 |
| Tritanopia (no blue cones) | #004758 | 0.121 |
| Achromatopsia (no color) | #3D3D3D | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #33318A
#33318A
oklch(37.4% 0.144 277.9)
- #4C4000
#4C4000
oklch(37.3% 0.077 97.1)
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 #33318A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.049
- Blueberry #464196 ΔE 0.056
- Sapphire #2138AB ΔE 0.060
- Cobalt #1E488F ΔE 0.060
- Twilight Blue #0A437A ΔE 0.065
- Indigo Blue #3A18B1 ΔE 0.072
- Imperial Purple #480CA8 ΔE 0.074
- Marine Blue #01386A ΔE 0.076
Use #33318A 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.