#333D84
Closest named color: Dark Slate Blue (#483D8B). oklch(39.2% 0.119 273.6), rgb(51, 61, 132).
Aa
White text reads best on this color (9.80:1).
About this color
#333D84 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.119 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.035 away. White text reads best on it, at 9.80:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.14:1 |
| White text | 9.80:1 |
Values
| HEX | #333D84 |
| RGB | rgb(51, 61, 132) |
| HSL | hsl(233, 44%, 36%) |
| OKLCH | oklch(39.2% 0.119 273.6) |
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 #333D84 | 9.80:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #333D84 | 2.14:1 | Fails | Lc 11.5 | Not readable |
| #333D84 text on white | 9.80:1 | AAA | Lc 92.5 | Preferred for body text |
| #333D84 text on black | 2.14:1 | Fails | Lc -10.0 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED8FB
oklch(88.6% 0.049 272.8)
-
Step 300
300
#AEBDFB
oklch(80.9% 0.089 273.7)
-
Step 400
400
#8598F9
oklch(70.7% 0.143 273.8)
-
Step 500
500
#697BF5
oklch(63% 0.182 273.7)
-
Step 600
600
#5361E4
oklch(55.6% 0.197 273.5)
-
Step 700
700
#444FC6
oklch(49.1% 0.183 273.5)
-
Step 800
800
#3841A0
oklch(42.6% 0.152 273.9)
-
Step 900
900 (this color)
#333D84
oklch(39.2% 0.119 273.6)
-
Step 950
950
#1B224A
oklch(27% 0.074 273)
#333D84 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) | #144787 | 0.037 |
| Deuteranopia (no green cones) | #004083 | 0.042 |
| Tritanopia (no blue cones) | #004D5A | 0.103 |
| Achromatopsia (no color) | #444444 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333D84
#333D84
oklch(39.2% 0.119 273.6)
- #544400
#544400
oklch(39.2% 0.08 93.6)
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 #333D84, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.035
- Cobalt #1E488F ΔE 0.037
- Blueberry #464196 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.044
- Light Navy #155084 ΔE 0.057
- Dusk Blue #26538D ΔE 0.061
- Marine Blue #01386A ΔE 0.069
- Sapphire #2138AB ΔE 0.069
Use #333D84 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.