#6551B3
Closest named color: Iris (#6258C4). oklch(50.5% 0.149 289.3), rgb(101, 81, 179).
Aa
White text reads best on this color (6.21:1).
About this color
#6551B3 is a medium-dark, vivid purple. In OKLCH its lightness is 51%, its chroma 0.149 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.030 away. White text reads best on it, at 6.21:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.38:1 |
| White text | 6.21:1 |
Values
| HEX | #6551B3 |
| RGB | rgb(101, 81, 179) |
| HSL | hsl(252, 39%, 51%) |
| OKLCH | oklch(50.5% 0.149 289.3) |
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 #6551B3 | 6.21:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #6551B3 | 3.38:1 | AA large text | Lc 23.4 | Dividers and decoration only |
| #6551B3 text on white | 6.21:1 | AA | Lc 80.7 | Fine for body text |
| #6551B3 text on black | 3.38:1 | AA large text | Lc -21.1 | 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
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D8D5F3
oklch(88.5% 0.041 290.1)
-
Step 300
300
#BFB9ED
oklch(80.8% 0.073 289.9)
-
Step 400
400
#9F94E4
oklch(70.7% 0.116 289.4)
-
Step 500
500
#8977DC
oklch(63.1% 0.148 289.6)
-
Step 600
600
#735ECA
oklch(55.6% 0.161 289)
-
Step 700
700 (this color)
#6551B3
oklch(50.5% 0.149 289.3)
-
Step 800
800
#4F3F8D
oklch(42.6% 0.124 289.5)
-
Step 900
900
#413771
oklch(37.8% 0.096 288.9)
-
Step 950
950
#262042
oklch(26.9% 0.062 289.7)
#6551B3 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) | #2063B6 | 0.085 |
| Deuteranopia (no green cones) | #225EB1 | 0.082 |
| Tritanopia (no blue cones) | #4E667A | 0.123 |
| Achromatopsia (no color) | #616161 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6551B3
#6551B3
oklch(50.5% 0.149 289.3)
- #6A6900
#6A6900
oklch(50.5% 0.11 109.1)
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 #6551B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.030
- Slate Blue #6A5ACD ΔE 0.045
- Bluey Purple #6241C7 ΔE 0.049
- Light Indigo #6D5ACF ΔE 0.049
- Dark Periwinkle #665FD1 ΔE 0.055
- Blue With A Hint Of Purple #533CC6 ΔE 0.066
- Warm Blue #4B57DB ΔE 0.072
- Blurple #5539CC ΔE 0.073
Use #6551B3 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.