#6551B0
Closest named color: Iris (#6258C4). oklch(50.3% 0.145 289.8), rgb(101, 81, 176).
Aa
White text reads best on this color (6.25:1).
About this color
#6551B0 is a medium-dark, vivid purple. In OKLCH its lightness is 50%, its chroma 0.145 and its hue 290°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.034 away. White text reads best on it, at 6.25:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.35:1 |
| White text | 6.25:1 |
Values
| HEX | #6551B0 |
| RGB | rgb(101, 81, 176) |
| HSL | hsl(253, 38%, 50%) |
| OKLCH | oklch(50.3% 0.145 289.8) |
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 #6551B0 | 6.25:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #6551B0 | 3.35:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #6551B0 text on white | 6.25:1 | AA | Lc 80.9 | Fine for body text |
| #6551B0 text on black | 3.35:1 | AA large text | Lc -20.9 | 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
#D8D5F2
oklch(88.4% 0.04 290.3)
-
Step 300
300
#BFBAEC
oklch(81% 0.07 289.3)
-
Step 400
400
#9F94E2
oklch(70.6% 0.113 289.7)
-
Step 500
500
#8978DA
oklch(63.2% 0.144 289.6)
-
Step 600
600
#745FC7
oklch(55.7% 0.156 289.7)
-
Step 700
700 (this color)
#6551B0
oklch(50.3% 0.145 289.8)
-
Step 800
800
#50408B
oklch(42.7% 0.12 290.2)
-
Step 900
900
#42376F
oklch(37.7% 0.093 290.2)
-
Step 950
950
#262141
oklch(27.1% 0.058 289.1)
#6551B0 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) | #2462B3 | 0.082 |
| Deuteranopia (no green cones) | #265EAE | 0.080 |
| Tritanopia (no blue cones) | #506578 | 0.120 |
| Achromatopsia (no color) | #606060 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6551B0
#6551B0
oklch(50.3% 0.145 289.8)
- #696900
#696900
oklch(50.4% 0.11 109.8)
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 #6551B0, closest first.
No curated palette has a color within ΔE 0.04 of #6551B0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.034
- Slate Blue #6A5ACD ΔE 0.049
- Bluey Purple #6241C7 ΔE 0.053
- Light Indigo #6D5ACF ΔE 0.053
- Dark Periwinkle #665FD1 ΔE 0.059
- Blue With A Hint Of Purple #533CC6 ΔE 0.069
- Twilight #4E518B ΔE 0.071
- Rebecca Purple #663399 ΔE 0.074
Use #6551B0 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.