#663BCB
Closest named color: Bluey Purple (#6241C7). oklch(49.1% 0.208 290.3), rgb(102, 59, 203).
Aa
White text reads best on this color (6.87:1).
About this color
#663BCB is a medium-dark, vivid purple. In OKLCH its lightness is 49%, its chroma 0.208 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Bluey Purple (#6241C7), ΔE 0.014 away. White text reads best on it, at 6.87:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.208) |
| Temperature | in between |
| Nearest name | Bluey Purple (#6241C7) |
| Black text | 3.05:1 |
| White text | 6.87:1 |
Values
| HEX | #663BCB |
| RGB | rgb(102, 59, 203) |
| HSL | hsl(258, 58%, 51%) |
| OKLCH | oklch(49.1% 0.208 290.3) |
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 #663BCB | 6.87:1 | AA | Lc -88.0 | Fine for body text |
| Black text on #663BCB | 3.05:1 | AA large text | Lc 21.0 | Dividers and decoration only |
| #663BCB text on white | 6.87:1 | AA | Lc 83.0 | Fine for body text |
| #663BCB text on black | 3.05:1 | AA large text | Lc -18.9 | 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
#E9E7FD
oklch(93.6% 0.03 290)
-
Step 200
200
#D8D4FC
oklch(88.6% 0.055 289.8)
-
Step 300
300
#C0B6FD
oklch(81% 0.1 290.4)
-
Step 400
400
#A18CFD
oklch(70.7% 0.161 290.2)
-
Step 500
500
#8D6AFA
oklch(63.1% 0.205 290.5)
-
Step 600
600
#794CE9
oklch(55.7% 0.223 290.4)
-
Step 700
700 (this color)
#663BCB
oklch(49.1% 0.208 290.3)
-
Step 800
800
#5332A4
oklch(42.7% 0.173 290.4)
-
Step 900
900
#442E82
oklch(37.7% 0.135 290.5)
-
Step 950
950
#271C4C
oklch(26.9% 0.085 290)
#663BCB 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) | #005DCF | 0.111 |
| Deuteranopia (no green cones) | #0057C8 | 0.108 |
| Tritanopia (no blue cones) | #43617F | 0.168 |
| Achromatopsia (no color) | #5A5A5A | 0.210 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663BCB
#663BCB
oklch(49.1% 0.208 290.3)
- #656500
#656500
oklch(49.1% 0.107 109.8)
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 #663BCB, closest first.
No curated palette has a color within ΔE 0.04 of #663BCB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluey Purple #6241C7 ΔE 0.014
- Blurple #5539CC ΔE 0.031
- Blue With A Hint Of Purple #533CC6 ΔE 0.033
- Burple #6832E3 ΔE 0.039
- Purple Blue #5D21D0 ΔE 0.043
- Purpley Blue #5F34E7 ΔE 0.047
- Iris #6258C4 ΔE 0.062
- Purply Blue #661AEE ΔE 0.064
Use #663BCB 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.