#663FC5
Closest named color: Bluey Purple (#6241C7). oklch(49.2% 0.197 290.7), rgb(102, 63, 197).
Aa
White text reads best on this color (6.81:1).
About this color
#663FC5 is a medium-dark, vivid purple. In OKLCH its lightness is 49%, its chroma 0.197 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Bluey Purple (#6241C7), ΔE 0.008 away. White text reads best on it, at 6.81:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.197) |
| Temperature | in between |
| Nearest name | Bluey Purple (#6241C7) |
| Black text | 3.08:1 |
| White text | 6.81:1 |
Values
| HEX | #663FC5 |
| RGB | rgb(102, 63, 197) |
| HSL | hsl(257, 54%, 51%) |
| OKLCH | oklch(49.2% 0.197 290.7) |
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 #663FC5 | 6.81:1 | AA | Lc -87.9 | Fine for body text |
| Black text on #663FC5 | 3.08:1 | AA large text | Lc 21.2 | Dividers and decoration only |
| #663FC5 text on white | 6.81:1 | AA | Lc 82.9 | Fine for body text |
| #663FC5 text on black | 3.08:1 | AA large text | Lc -19.0 | Dividers and decoration only |
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 700.
-
Step 50
50
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E9E7FB
oklch(93.5% 0.027 290.5)
-
Step 200
200
#D8D4FA
oklch(88.5% 0.052 290.1)
-
Step 300
300
#C0B6FA
oklch(80.9% 0.095 290.8)
-
Step 400
400
#A18DF7
oklch(70.6% 0.152 290.6)
-
Step 500
500
#8D6DF4
oklch(63.2% 0.194 290.7)
-
Step 600
600
#7950E3
oklch(55.7% 0.211 290.7)
-
Step 700
700 (this color)
#663FC5
oklch(49.2% 0.197 290.7)
-
Step 800
800
#53359F
oklch(42.7% 0.163 290.9)
-
Step 900
900
#44307E
oklch(37.7% 0.126 290.9)
-
Step 950
950
#271D4A
oklch(27% 0.08 290.2)
#663FC5 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) | #005DC9 | 0.109 |
| Deuteranopia (no green cones) | #0058C2 | 0.107 |
| Tritanopia (no blue cones) | #47617D | 0.158 |
| Achromatopsia (no color) | #5B5B5B | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663FC5
#663FC5
oklch(49.2% 0.197 290.7)
- #646600
#646600
oklch(49.2% 0.108 111.1)
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 #663FC5, closest first.
No curated palette has a color within ΔE 0.04 of #663FC5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluey Purple #6241C7 ΔE 0.008
- Blue With A Hint Of Purple #533CC6 ΔE 0.034
- Blurple #5539CC ΔE 0.035
- Burple #6832E3 ΔE 0.050
- Purple Blue #5D21D0 ΔE 0.052
- Iris #6258C4 ΔE 0.054
- Purpley Blue #5F34E7 ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.060
Use #663FC5 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.