#6B51BB
Closest named color: Iris (#6258C4). oklch(51.6% 0.16 291), rgb(107, 81, 187).
Aa
White text reads best on this color (5.96:1).
About this color
#6B51BB is a medium-dark, vivid purple. In OKLCH its lightness is 52%, its chroma 0.160 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.024 away. White text reads best on it, at 5.96:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.160) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.51:1 |
| White text | 5.96:1 |
Values
| HEX | #6B51BB |
| RGB | rgb(107, 81, 187) |
| HSL | hsl(255, 44%, 53%) |
| OKLCH | oklch(51.6% 0.16 291) |
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 #6B51BB | 5.96:1 | AA | Lc -84.7 | Fine for body text |
| Black text on #6B51BB | 3.51:1 | AA large text | Lc 24.5 | Dividers and decoration only |
| #6B51BB text on white | 5.96:1 | AA | Lc 79.5 | Fine for body text |
| #6B51BB text on black | 3.51:1 | AA large text | Lc -22.3 | 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 700.
-
Step 50
50
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F8
oklch(93.6% 0.021 288.9)
-
Step 200
200
#D9D5F4
oklch(88.6% 0.042 291.4)
-
Step 300
300
#C0B8F0
oklch(80.8% 0.079 291.1)
-
Step 400
400
#A192E8
oklch(70.7% 0.124 290.9)
-
Step 500
500
#8C74E1
oklch(63.1% 0.159 291.3)
-
Step 600
600
#775ACE
oklch(55.6% 0.172 291.3)
-
Step 700
700 (this color)
#6B51BB
oklch(51.6% 0.16 291)
-
Step 800
800
#513D91
oklch(42.7% 0.133 290.6)
-
Step 900
900
#433573
oklch(37.7% 0.103 291.1)
-
Step 950
950
#271F44
oklch(26.9% 0.067 291.2)
#6B51BB 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) | #1465BF | 0.098 |
| Deuteranopia (no green cones) | #1C61B9 | 0.094 |
| Tritanopia (no blue cones) | #54687E | 0.130 |
| Achromatopsia (no color) | #636363 | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6B51BB
#6B51BB
oklch(51.6% 0.16 291)
- #6B6D00
#6B6D00
oklch(51.6% 0.113 111)
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 #6B51BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.024
- Slate Blue #6A5ACD ΔE 0.033
- Light Indigo #6D5ACF ΔE 0.036
- Bluey Purple #6241C7 ΔE 0.045
- Dark Periwinkle #665FD1 ΔE 0.045
- Blue With A Hint Of Purple #533CC6 ΔE 0.067
- Warm Blue #4B57DB ΔE 0.068
- Deep Lavender #8D5EB7 ΔE 0.071
Use #6B51BB 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.