#6663BB
Closest named color: Iris (#6258C4). oklch(54.5% 0.134 282.5), rgb(102, 99, 187).
Aa
White text reads best on this color (5.16:1).
About this color
#6663BB is a medium-dark, moderately saturated purple. In OKLCH its lightness is 54%, its chroma 0.134 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.034 away. White text reads best on it, at 5.16:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 4.06:1 |
| White text | 5.16:1 |
Values
| HEX | #6663BB |
| RGB | rgb(102, 99, 187) |
| HSL | hsl(242, 39%, 56%) |
| OKLCH | oklch(54.5% 0.134 282.5) |
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 #6663BB | 5.16:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #6663BB | 4.06:1 | AA large text | Lc 28.7 | Dividers and decoration only |
| #6663BB text on white | 5.16:1 | AA | Lc 75.4 | Fine for body text |
| #6663BB text on black | 4.06:1 | AA large text | Lc -26.3 | 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 600.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E9F6
oklch(93.7% 0.018 282.5)
-
Step 200
200
#D5D7EF
oklch(88.5% 0.033 281.9)
-
Step 300
300
#BABCE7
oklch(80.8% 0.06 282.9)
-
Step 400
400
#9799DB
oklch(70.7% 0.096 282.3)
-
Step 500
500
#7F7ED2
oklch(63% 0.125 282.8)
-
Step 600
600 (this color)
#6663BB
oklch(54.5% 0.134 282.5)
-
Step 700
700
#5855A5
oklch(49.2% 0.125 282.5)
-
Step 800
800
#484685
oklch(42.8% 0.102 282.6)
-
Step 900
900
#3C3B6B
oklch(37.7% 0.081 282.8)
-
Step 950
950
#23233F
oklch(27.1% 0.051 282.4)
#6663BB 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) | #3F70BE | 0.054 |
| Deuteranopia (no green cones) | #3A6AB9 | 0.055 |
| Tritanopia (no blue cones) | #4A7586 | 0.115 |
| Achromatopsia (no color) | #6D6D6D | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6663BB
#6663BB
oklch(54.5% 0.134 282.5)
- #7D7200
#7D7200
oklch(54.5% 0.114 102.8)
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 #6663BB, closest first.
No curated palette has a color within ΔE 0.04 of #6663BB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.034
- Dark Periwinkle #665FD1 ΔE 0.037
- Slate Blue #6A5ACD ΔE 0.038
- Light Indigo #6D5ACF ΔE 0.041
- French Blue #436BAD ΔE 0.055
- Deep Lavender #8D5EB7 ΔE 0.063
- Windows Blue #3778BF ΔE 0.071
- Mid Blue #276AB3 ΔE 0.072
Use #6663BB 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.