#333990
Closest named color: Dark Slate Blue (#483D8B). oklch(39.4% 0.142 274.8), rgb(51, 57, 144).
Aa
White text reads best on this color (9.86:1).
About this color
#333990 is a dark, vivid blue. In OKLCH its lightness is 39%, its chroma 0.142 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 9.86:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.12:1 |
| White text | 9.86:1 |
Values
| HEX | #333990 |
| RGB | rgb(51, 57, 144) |
| HSL | hsl(236, 48%, 38%) |
| OKLCH | oklch(39.4% 0.142 274.8) |
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 #333990 | 9.86:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #333990 | 2.12:1 | Fails | Lc 11.5 | Not readable |
| #333990 text on white | 9.86:1 | AAA | Lc 92.5 | Preferred for body text |
| #333990 text on black | 2.12:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8596FF
oklch(70.6% 0.154 274.8)
-
Step 500
500
#6A77FF
oklch(63% 0.2 275)
-
Step 600
600
#5456F9
oklch(55.6% 0.236 275)
-
Step 700
700
#4545D9
oklch(49.1% 0.219 274.8)
-
Step 800
800
#383AAF
oklch(42.7% 0.181 274.8)
-
Step 900
900 (this color)
#333990
oklch(39.4% 0.142 274.8)
-
Step 950
950
#1B1F51
oklch(26.9% 0.09 275.1)
#333990 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) | #004793 | 0.048 |
| Deuteranopia (no green cones) | #003F8E | 0.042 |
| Tritanopia (no blue cones) | #004E5F | 0.118 |
| Achromatopsia (no color) | #434343 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333990
#333990
oklch(39.4% 0.142 274.8)
- #544500
#544500
oklch(39.4% 0.081 94.8)
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 #333990, 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
- Blueberry #464196 ΔE 0.039
- Cobalt #1E488F ΔE 0.042
- Sapphire #2138AB ΔE 0.049
- Twilight Blue #0A437A ΔE 0.059
- Light Navy #155084 ΔE 0.071
- Dusk Blue #26538D ΔE 0.071
- Indigo Blue #3A18B1 ΔE 0.075
Use #333990 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.