#3F1BCE
Closest named color: Violet Blue (#510AC9). oklch(42.6% 0.243 277.7), rgb(63, 27, 206).
Aa
White text reads best on this color (9.29:1).
About this color
#3F1BCE is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.243 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Violet Blue (#510AC9), ΔE 0.035 away. White text reads best on it, at 9.29:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.243) |
| Temperature | cool |
| Nearest name | Violet Blue (#510AC9) |
| Black text | 2.25:1 |
| White text | 9.29:1 |
Values
| HEX | #3F1BCE |
| RGB | rgb(63, 27, 206) |
| HSL | hsl(252, 77%, 46%) |
| OKLCH | oklch(42.6% 0.243 277.7) |
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 #3F1BCE | 9.29:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #3F1BCE | 2.25:1 | Fails | Lc 14.3 | Not readable |
| #3F1BCE text on white | 9.29:1 | AAA | Lc 89.7 | Fine for body text |
| #3F1BCE text on black | 2.25:1 | Fails | Lc -12.5 | 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 800.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E8FF
oklch(93.5% 0.031 277.9)
-
Step 200
200
#CFD6FF
oklch(88.4% 0.057 277.5)
-
Step 300
300
#B1BBFF
oklch(80.9% 0.097 277.5)
-
Step 400
400
#8B95FF
oklch(70.8% 0.154 277.6)
-
Step 500
500
#7175FF
oklch(63.1% 0.201 277.7)
-
Step 600
600
#5C4FFF
oklch(55.6% 0.249 277.8)
-
Step 700
700
#4F15FF
oklch(49.1% 0.292 277.8)
-
Step 800
800 (this color)
#3F1BCE
oklch(42.6% 0.243 277.7)
-
Step 900
900
#3324A2
oklch(37.7% 0.189 277.6)
-
Step 950
950
#1D185F
oklch(27% 0.12 277.8)
#3F1BCE 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) | #004ED3 | 0.087 |
| Deuteranopia (no green cones) | #0040CB | 0.067 |
| Tritanopia (no blue cones) | #00587A | 0.189 |
| Achromatopsia (no color) | #474747 | 0.245 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F1BCE
#3F1BCE
oklch(42.6% 0.243 277.7)
- #5C4E00
#5C4E00
oklch(42.5% 0.088 97.2)
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 #3F1BCE, closest first.
No curated palette has a color within ΔE 0.04 of #3F1BCE.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Violet Blue #510AC9 ΔE 0.035
- Majorelle Blue #3F37C9 ΔE 0.038
- Indigo Blue #3A18B1 ΔE 0.049
- Purple Blue #5D21D0 ΔE 0.056
- Ultramarine Blue #1805DB ΔE 0.060
- Blurple #5539CC ΔE 0.061
- Blue Blue #2242C7 ΔE 0.061
- Blue With A Hint Of Purple #533CC6 ΔE 0.063
Use #3F1BCE 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.