#6555B9
Closest named color: Iris (#6258C4). oklch(51.7% 0.152 287.2), rgb(101, 85, 185).
Aa
White text reads best on this color (5.91:1).
About this color
#6555B9 is a medium-dark, vivid purple. In OKLCH its lightness is 52%, its chroma 0.152 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.018 away. White text reads best on it, at 5.91:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.55:1 |
| White text | 5.91:1 |
Values
| HEX | #6555B9 |
| RGB | rgb(101, 85, 185) |
| HSL | hsl(250, 42%, 53%) |
| OKLCH | oklch(51.7% 0.152 287.2) |
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 #6555B9 | 5.91:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #6555B9 | 3.55:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #6555B9 text on white | 5.91:1 | AA | Lc 79.3 | Fine for body text |
| #6555B9 text on black | 3.55:1 | AA large text | Lc -22.5 | 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
#F5F5FC
oklch(97.2% 0.009 286.2)
-
Step 100
100
#E8E8F8
oklch(93.6% 0.022 286)
-
Step 200
200
#D7D6F3
oklch(88.6% 0.04 287.1)
-
Step 300
300
#BDBAEE
oklch(80.9% 0.073 287.3)
-
Step 400
400
#9C95E6
oklch(70.8% 0.117 287)
-
Step 500
500
#8578DE
oklch(63% 0.15 287.1)
-
Step 600
600
#705FCC
oklch(55.7% 0.162 287)
-
Step 700
700 (this color)
#6555B9
oklch(51.7% 0.152 287.2)
-
Step 800
800
#4D408F
oklch(42.7% 0.126 287.4)
-
Step 900
900
#3F3772
oklch(37.6% 0.098 286.9)
-
Step 950
950
#252143
oklch(27.1% 0.062 286.9)
#6555B9 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) | #2267BC | 0.081 |
| Deuteranopia (no green cones) | #2161B7 | 0.080 |
| Tritanopia (no blue cones) | #4B6B7F | 0.127 |
| Achromatopsia (no color) | #646464 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6555B9
#6555B9
oklch(51.7% 0.152 287.2)
- #706C00
#706C00
oklch(51.8% 0.111 107.2)
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 #6555B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.018
- Slate Blue #6A5ACD ΔE 0.034
- Light Indigo #6D5ACF ΔE 0.038
- Dark Periwinkle #665FD1 ΔE 0.042
- Bluey Purple #6241C7 ΔE 0.051
- Warm Blue #4B57DB ΔE 0.064
- Blue With A Hint Of Purple #533CC6 ΔE 0.070
- French Blue #436BAD ΔE 0.074
Use #6555B9 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.