#6B55CB
Closest named color: Slate Blue (#6A5ACD). oklch(53.5% 0.175 287.5), rgb(107, 85, 203).
Aa
White text reads best on this color (5.54:1).
About this color
#6B55CB is a medium-dark, vivid purple. In OKLCH its lightness is 53%, its chroma 0.175 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Slate Blue (#6A5ACD), ΔE 0.012 away. White text reads best on it, at 5.54:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Slate Blue (#6A5ACD) |
| Black text | 3.78:1 |
| White text | 5.54:1 |
Values
| HEX | #6B55CB |
| RGB | rgb(107, 85, 203) |
| HSL | hsl(251, 53%, 56%) |
| OKLCH | oklch(53.5% 0.175 287.5) |
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 #6B55CB | 5.54:1 | AA | Lc -82.7 | Fine for body text |
| Black text on #6B55CB | 3.78:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #6B55CB text on white | 5.54:1 | AA | Lc 77.4 | Fine for body text |
| #6B55CB text on black | 3.78:1 | AA large text | Lc -24.4 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E8E8F9
oklch(93.6% 0.023 286)
-
Step 200
200
#D7D5F5
oklch(88.5% 0.044 288.3)
-
Step 300
300
#BDB9F2
oklch(80.9% 0.08 287.7)
-
Step 400
400
#9C93EB
oklch(70.7% 0.127 287.4)
-
Step 500
500
#8676E4
oklch(63.1% 0.161 287.6)
-
Step 600
600 (this color)
#6B55CB
oklch(53.5% 0.175 287.5)
-
Step 700
700
#5F4BB6
oklch(49.2% 0.162 287.5)
-
Step 800
800
#4D3E93
oklch(42.7% 0.134 287.4)
-
Step 900
900
#403675
oklch(37.7% 0.104 287.6)
-
Step 950
950
#252045
oklch(27% 0.067 287.2)
#6B55CB 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) | #006BCF | 0.099 |
| Deuteranopia (no green cones) | #0065C8 | 0.098 |
| Tritanopia (no blue cones) | #4B7088 | 0.146 |
| Achromatopsia (no color) | #686868 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6B55CB
#6B55CB
oklch(53.5% 0.175 287.5)
- #757100
#757100
oklch(53.5% 0.115 107.3)
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 #6B55CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate Blue #6A5ACD ΔE 0.012
- Light Indigo #6D5ACF ΔE 0.013
- Iris #6258C4 ΔE 0.019
- Dark Periwinkle #665FD1 ΔE 0.025
- Bluey Purple #6241C7 ΔE 0.047
- Warm Blue #4B57DB ΔE 0.052
- Purpley #8756E4 ΔE 0.060
- Blue With A Hint Of Purple #533CC6 ΔE 0.071
Use #6B55CB 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.