#333B83
Closest named color: Dark Slate Blue (#483D8B). oklch(38.7% 0.12 274.6), rgb(51, 59, 131).
Aa
White text reads best on this color (10.02:1).
About this color
#333B83 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.120 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 10.02:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.02:1 |
Values
| HEX | #333B83 |
| RGB | rgb(51, 59, 131) |
| HSL | hsl(234, 44%, 36%) |
| OKLCH | oklch(38.7% 0.12 274.6) |
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 #333B83 | 10.02:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #333B83 | 2.09:1 | Fails | Lc 10.9 | Not readable |
| #333B83 text on white | 10.02:1 | AAA | Lc 93.0 | Preferred for body text |
| #333B83 text on black | 2.09:1 | Fails | Lc -9.5 | 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
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#AFBDFB
oklch(81% 0.089 274.4)
-
Step 400
400
#8698F9
oklch(70.7% 0.143 274.2)
-
Step 500
500
#6B7AF6
oklch(63% 0.184 274.7)
-
Step 600
600
#555FE5
oklch(55.5% 0.2 274.6)
-
Step 700
700
#464EC7
oklch(49.1% 0.185 274.4)
-
Step 800
800
#3941A1
oklch(42.8% 0.153 274.3)
-
Step 900
900 (this color)
#333B83
oklch(38.7% 0.12 274.6)
-
Step 950
950
#1C214B
oklch(26.9% 0.077 274.9)
#333B83 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) | #0E4686 | 0.041 |
| Deuteranopia (no green cones) | #003F82 | 0.043 |
| Tritanopia (no blue cones) | #004C59 | 0.105 |
| Achromatopsia (no color) | #424242 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333B83
#333B83
oklch(38.7% 0.12 274.6)
- #524300
#524300
oklch(38.7% 0.079 94.4)
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 #333B83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Cobalt #1E488F ΔE 0.041
- Twilight Blue #0A437A ΔE 0.045
- Blueberry #464196 ΔE 0.046
- Light Navy #155084 ΔE 0.062
- Dusk Blue #26538D ΔE 0.066
- Marine Blue #01386A ΔE 0.067
- Sapphire #2138AB ΔE 0.070
Use #333B83 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.