#663FBF
Closest named color: Bluey Purple (#6241C7). oklch(48.7% 0.189 291.8), rgb(102, 63, 191).
Aa
White text reads best on this color (6.93:1).
About this color
#663FBF is a medium-dark, vivid purple. In OKLCH its lightness is 49%, its chroma 0.189 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Bluey Purple (#6241C7), ΔE 0.015 away. White text reads best on it, at 6.93:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.189) |
| Temperature | in between |
| Nearest name | Bluey Purple (#6241C7) |
| Black text | 3.02:1 |
| White text | 6.93:1 |
Values
| HEX | #663FBF |
| RGB | rgb(102, 63, 191) |
| HSL | hsl(258, 50%, 50%) |
| OKLCH | oklch(48.7% 0.189 291.8) |
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 #663FBF | 6.93:1 | AA | Lc -88.4 | Fine for body text |
| Black text on #663FBF | 3.02:1 | AA large text | Lc 20.6 | Dividers and decoration only |
| #663FBF text on white | 6.93:1 | AA | Lc 83.4 | Fine for body text |
| #663FBF text on black | 3.02:1 | AA large text | Lc -18.5 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#EAE7FB
oklch(93.6% 0.027 292.8)
-
Step 200
200
#D9D4F9
oklch(88.6% 0.051 291.5)
-
Step 300
300
#C1B6F8
oklch(80.9% 0.093 291.8)
-
Step 400
400
#A38EF4
oklch(70.8% 0.147 291.7)
-
Step 500
500
#8E6EEF
oklch(63.1% 0.186 291.6)
-
Step 600
600
#7A51DE
oklch(55.6% 0.204 291.8)
-
Step 700
700 (this color)
#663FBF
oklch(48.7% 0.189 291.8)
-
Step 800
800
#54369C
oklch(42.7% 0.158 291.9)
-
Step 900
900
#45317C
oklch(37.8% 0.122 291.8)
-
Step 950
950
#281D48
oklch(26.9% 0.077 292.2)
#663FBF 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) | #005CC3 | 0.110 |
| Deuteranopia (no green cones) | #0057BC | 0.108 |
| Tritanopia (no blue cones) | #4B5E7A | 0.150 |
| Achromatopsia (no color) | #5A5A5A | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663FBF
#663FBF
oklch(48.7% 0.189 291.8)
- #626500
#626500
oklch(48.8% 0.108 111.8)
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 #663FBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluey Purple #6241C7 ΔE 0.015
- Blue With A Hint Of Purple #533CC6 ΔE 0.036
- Blurple #5539CC ΔE 0.040
- Iris #6258C4 ΔE 0.055
- Purple Blue #5D21D0 ΔE 0.056
- Burple #6832E3 ΔE 0.059
- Slate Blue #6A5ACD ΔE 0.063
- Rebecca Purple #663399 ΔE 0.065
Use #663FBF 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.