#6551B9
Closest named color: Iris (#6258C4). oklch(51% 0.157 288.4), rgb(101, 81, 185).
Aa
White text reads best on this color (6.12:1).
About this color
#6551B9 is a medium-dark, vivid purple. In OKLCH its lightness is 51%, its chroma 0.157 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.023 away. White text reads best on it, at 6.12:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.43:1 |
| White text | 6.12:1 |
Values
| HEX | #6551B9 |
| RGB | rgb(101, 81, 185) |
| HSL | hsl(252, 43%, 52%) |
| OKLCH | oklch(51% 0.157 288.4) |
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 #6551B9 | 6.12:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #6551B9 | 3.43:1 | AA large text | Lc 23.8 | Dividers and decoration only |
| #6551B9 text on white | 6.12:1 | AA | Lc 80.3 | Fine for body text |
| #6551B9 text on black | 3.43:1 | AA large text | Lc -21.6 | 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
#D7D5F4
oklch(88.4% 0.042 288.5)
-
Step 300
300
#BEB9F0
oklch(80.9% 0.077 288.7)
-
Step 400
400
#9E93E8
oklch(70.7% 0.123 288.8)
-
Step 500
500
#8776E1
oklch(63% 0.157 288.4)
-
Step 600
600
#725DCF
oklch(55.7% 0.169 288.1)
-
Step 700
700 (this color)
#6551B9
oklch(51% 0.157 288.4)
-
Step 800
800
#4E3E91
oklch(42.6% 0.131 288.4)
-
Step 900
900
#413673
oklch(37.7% 0.101 288.9)
-
Step 950
950
#262044
oklch(27% 0.065 288.9)
#6551B9 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) | #1464BD | 0.090 |
| Deuteranopia (no green cones) | #165FB7 | 0.088 |
| Tritanopia (no blue cones) | #4B687D | 0.131 |
| Achromatopsia (no color) | #626262 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6551B9
#6551B9
oklch(51% 0.157 288.4)
- #6C6A00
#6C6A00
oklch(50.9% 0.11 108.4)
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 #6551B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.023
- Slate Blue #6A5ACD ΔE 0.038
- Light Indigo #6D5ACF ΔE 0.042
- Bluey Purple #6241C7 ΔE 0.043
- Dark Periwinkle #665FD1 ΔE 0.048
- Blue With A Hint Of Purple #533CC6 ΔE 0.062
- Warm Blue #4B57DB ΔE 0.065
- Blurple #5539CC ΔE 0.068
Use #6551B9 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.