#33337B
Closest named color: Dark Slate Blue (#483D8B). oklch(36.5% 0.119 278.7), rgb(51, 51, 123).
Aa
White text reads best on this color (11.05:1).
About this color
#33337B is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.119 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.052 away. White text reads best on it, at 11.05:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.90:1 |
| White text | 11.05:1 |
Values
| HEX | #33337B |
| RGB | rgb(51, 51, 123) |
| HSL | hsl(240, 41%, 34%) |
| OKLCH | oklch(36.5% 0.119 278.7) |
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 #33337B | 11.05:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #33337B | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #33337B text on white | 11.05:1 | AAA | Lc 95.3 | Preferred for body text |
| #33337B text on black | 1.90:1 | Fails | Lc -7.4 | 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
#E6E9FC
oklch(93.7% 0.026 278.7)
-
Step 200
200
#D1D7FA
oklch(88.6% 0.049 277.7)
-
Step 300
300
#B3BBFA
oklch(80.8% 0.089 278.6)
-
Step 400
400
#8E95F8
oklch(70.6% 0.144 279)
-
Step 500
500
#7478F5
oklch(63.2% 0.183 278.4)
-
Step 600
600
#5F5CE3
oklch(55.5% 0.199 278.7)
-
Step 700
700
#4F4BC6
oklch(49.1% 0.186 278.5)
-
Step 800
800
#413EA0
oklch(42.7% 0.154 279)
-
Step 900
900 (this color)
#33337B
oklch(36.5% 0.119 278.7)
-
Step 950
950
#1F214A
oklch(27.1% 0.075 278.1)
#33337B 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) | #003F7D | 0.051 |
| Deuteranopia (no green cones) | #00397A | 0.048 |
| Tritanopia (no blue cones) | #0C4451 | 0.105 |
| Achromatopsia (no color) | #3C3C3C | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #33337B
#33337B
oklch(36.5% 0.119 278.7)
- #493E00
#493E00
oklch(36.4% 0.075 97.9)
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 #33337B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.052
- Twilight Blue #0A437A ΔE 0.055
- Marine Blue #01386A ΔE 0.059
- Cobalt #1E488F ΔE 0.064
- Blueberry #464196 ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.072
- Marine #042E60 ΔE 0.075
- Midnight Blue #191970 ΔE 0.082
Use #33337B 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.