#6B51CE
Closest named color: Slate Blue (#6A5ACD). oklch(53% 0.185 288), rgb(107, 81, 206).
Aa
White text reads best on this color (5.68:1).
About this color
#6B51CE is a medium-dark, vivid purple. In OKLCH its lightness is 53%, its chroma 0.185 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Slate Blue (#6A5ACD), ΔE 0.020 away. White text reads best on it, at 5.68:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Slate Blue (#6A5ACD) |
| Black text | 3.69:1 |
| White text | 5.68:1 |
Values
| HEX | #6B51CE |
| RGB | rgb(107, 81, 206) |
| HSL | hsl(252, 56%, 56%) |
| OKLCH | oklch(53% 0.185 288) |
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 #6B51CE | 5.68:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #6B51CE | 3.69:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #6B51CE text on white | 5.68:1 | AA | Lc 78.0 | Fine for body text |
| #6B51CE text on black | 3.69:1 | AA large text | Lc -23.8 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E9E8FA
oklch(93.7% 0.024 288.5)
-
Step 200
200
#D7D5F7
oklch(88.5% 0.047 288.1)
-
Step 300
300
#BDB9F4
oklch(81% 0.083 287.5)
-
Step 400
400
#9D92EE
oklch(70.7% 0.132 288)
-
Step 500
500
#8774E9
oklch(63.2% 0.17 288)
-
Step 600
600 (this color)
#6B51CE
oklch(53% 0.185 288)
-
Step 700
700
#6048BA
oklch(49.1% 0.172 288.1)
-
Step 800
800
#4E3C97
oklch(42.7% 0.143 287.9)
-
Step 900
900
#403478
oklch(37.6% 0.112 287.9)
-
Step 950
950
#251F46
oklch(26.9% 0.07 287.8)
#6B51CE 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) | #006AD2 | 0.102 |
| Deuteranopia (no green cones) | #0063CB | 0.100 |
| Tritanopia (no blue cones) | #4A6E88 | 0.152 |
| Achromatopsia (no color) | #676767 | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6B51CE
#6B51CE
oklch(53% 0.185 288)
- #737000
#737000
oklch(53.1% 0.114 107.9)
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 #6B51CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate Blue #6A5ACD ΔE 0.020
- Light Indigo #6D5ACF ΔE 0.021
- Iris #6258C4 ΔE 0.026
- Dark Periwinkle #665FD1 ΔE 0.032
- Bluey Purple #6241C7 ΔE 0.040
- Warm Blue #4B57DB ΔE 0.051
- Purpley #8756E4 ΔE 0.059
- Blue With A Hint Of Purple #533CC6 ΔE 0.064
Use #6B51CE 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.