#6551AD
Closest named color: Iris (#6258C4). oklch(50.1% 0.141 290.4), rgb(101, 81, 173).
Aa
White text reads best on this color (6.29:1).
About this color
#6551AD is a medium-dark, vivid purple. In OKLCH its lightness is 50%, its chroma 0.141 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.038 away. White text reads best on it, at 6.29:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.141) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.33:1 |
| White text | 6.29:1 |
Values
| HEX | #6551AD |
| RGB | rgb(101, 81, 173) |
| HSL | hsl(253, 36%, 50%) |
| OKLCH | oklch(50.1% 0.141 290.4) |
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 #6551AD | 6.29:1 | AA | Lc -86.3 | Fine for body text |
| Black text on #6551AD | 3.33:1 | AA large text | Lc 22.9 | Dividers and decoration only |
| #6551AD text on white | 6.29:1 | AA | Lc 81.1 | Fine for body text |
| #6551AD text on black | 3.33:1 | AA large text | Lc -20.7 | 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D8D5F1
oklch(88.4% 0.038 290.5)
-
Step 300
300
#C0BAEA
oklch(81% 0.067 290.5)
-
Step 400
400
#A094E0
oklch(70.6% 0.11 290.5)
-
Step 500
500
#8A78D7
oklch(63.1% 0.14 290.5)
-
Step 600
600
#755FC4
oklch(55.6% 0.152 290.6)
-
Step 700
700 (this color)
#6551AD
oklch(50.1% 0.141 290.4)
-
Step 800
800
#504089
oklch(42.6% 0.117 290.7)
-
Step 900
900
#42376E
oklch(37.7% 0.092 290.5)
-
Step 950
950
#262140
oklch(27% 0.057 289.5)
#6551AD 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) | #2862B0 | 0.080 |
| Deuteranopia (no green cones) | #2A5EAB | 0.078 |
| Tritanopia (no blue cones) | #516477 | 0.116 |
| Achromatopsia (no color) | #606060 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6551AD
#6551AD
oklch(50.1% 0.141 290.4)
- #686800
#686800
oklch(50.1% 0.109 109.8)
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 #6551AD, closest first.
No curated palette has a color within ΔE 0.04 of #6551AD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.038
- Slate Blue #6A5ACD ΔE 0.053
- Bluey Purple #6241C7 ΔE 0.056
- Light Indigo #6D5ACF ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.063
- Twilight #4E518B ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.072
- Dusky Blue #475F94 ΔE 0.072
Use #6551AD 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.