#6660BC
Closest named color: Iris (#6258C4). oklch(54% 0.14 283.6), rgb(102, 96, 188).
Aa
White text reads best on this color (5.29:1).
About this color
#6660BC is a medium-dark, moderately saturated purple. In OKLCH its lightness is 54%, its chroma 0.140 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.026 away. White text reads best on it, at 5.29:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.96:1 |
| White text | 5.29:1 |
Values
| HEX | #6660BC |
| RGB | rgb(102, 96, 188) |
| HSL | hsl(244, 41%, 56%) |
| OKLCH | oklch(54% 0.14 283.6) |
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 #6660BC | 5.29:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #6660BC | 3.96:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #6660BC text on white | 5.29:1 | AA | Lc 76.2 | Fine for body text |
| #6660BC text on black | 3.96:1 | AA large text | Lc -25.6 | 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
#D5D7F0
oklch(88.5% 0.034 282)
-
Step 300
300
#BBBCE9
oklch(81% 0.063 283.9)
-
Step 400
400
#9898DE
oklch(70.7% 0.102 283.5)
-
Step 500
500
#807DD4
oklch(63% 0.129 283.6)
-
Step 600
600 (this color)
#6660BC
oklch(54% 0.14 283.6)
-
Step 700
700
#5953A7
oklch(49.1% 0.131 283.7)
-
Step 800
800
#494587
oklch(42.8% 0.107 283.7)
-
Step 900
900
#3C3A6C
oklch(37.6% 0.084 283.4)
-
Step 950
950
#23223F
oklch(26.9% 0.053 283.8)
#6660BC 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) | #396EBF | 0.060 |
| Deuteranopia (no green cones) | #3468BA | 0.061 |
| Tritanopia (no blue cones) | #4A7385 | 0.119 |
| Achromatopsia (no color) | #6B6B6B | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6660BC
#6660BC
oklch(54% 0.14 283.6)
- #7A7100
#7A7100
oklch(54% 0.114 104)
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 #6660BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.026
- Slate Blue #6A5ACD ΔE 0.032
- Dark Periwinkle #665FD1 ΔE 0.033
- Light Indigo #6D5ACF ΔE 0.036
- French Blue #436BAD ΔE 0.059
- Deep Lavender #8D5EB7 ΔE 0.064
- Warm Blue #4B57DB ΔE 0.068
- Royal Blue #4169E1 ΔE 0.071
Use #6660BC 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.