#333B8A
Closest named color: Dark Slate Blue (#483D8B). oklch(39.3% 0.13 274.4), rgb(51, 59, 138).
Aa
White text reads best on this color (9.84:1).
About this color
#333B8A is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.130 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.034 away. White text reads best on it, at 9.84:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.13:1 |
| White text | 9.84:1 |
Values
| HEX | #333B8A |
| RGB | rgb(51, 59, 138) |
| HSL | hsl(234, 46%, 37%) |
| OKLCH | oklch(39.3% 0.13 274.4) |
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 #333B8A | 9.84:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #333B8A | 2.13:1 | Fails | Lc 11.4 | Not readable |
| #333B8A text on white | 9.84:1 | AAA | Lc 92.5 | Preferred for body text |
| #333B8A text on black | 2.13:1 | Fails | Lc -9.9 | 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
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CED7FE
oklch(88.5% 0.055 275)
-
Step 300
300
#ADBCFF
oklch(80.8% 0.096 274.3)
-
Step 400
400
#8597FF
oklch(70.8% 0.153 274.4)
-
Step 500
500
#6978FF
oklch(63.1% 0.199 274.4)
-
Step 600
600
#535CEF
oklch(55.7% 0.217 274.2)
-
Step 700
700
#454AD0
oklch(49.1% 0.202 274.5)
-
Step 800
800
#383EA8
oklch(42.7% 0.167 274.4)
-
Step 900
900 (this color)
#333B8A
oklch(39.3% 0.13 274.4)
-
Step 950
950
#1B214E
oklch(27.1% 0.082 273.9)
#333B8A 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) | #00478D | 0.046 |
| Deuteranopia (no green cones) | #004088 | 0.042 |
| Tritanopia (no blue cones) | #004E5C | 0.112 |
| Achromatopsia (no color) | #434343 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333B8A
#333B8A
oklch(39.3% 0.13 274.4)
- #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 #333B8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.034
- Cobalt #1E488F ΔE 0.038
- Blueberry #464196 ΔE 0.040
- Twilight Blue #0A437A ΔE 0.051
- Sapphire #2138AB ΔE 0.059
- Light Navy #155084 ΔE 0.063
- Dusk Blue #26538D ΔE 0.065
- Marine Blue #01386A ΔE 0.075
Use #333B8A 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.