#6551AA
Closest named color: Iris (#6258C4). oklch(49.9% 0.137 290.9), rgb(101, 81, 170).
Aa
White text reads best on this color (6.34:1).
About this color
#6551AA is a medium-dark, moderately saturated purple. In OKLCH its lightness is 50%, its chroma 0.137 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.043 away. White text reads best on it, at 6.34:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.137) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.31:1 |
| White text | 6.34:1 |
Values
| HEX | #6551AA |
| RGB | rgb(101, 81, 170) |
| HSL | hsl(253, 35%, 49%) |
| OKLCH | oklch(49.9% 0.137 290.9) |
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 #6551AA | 6.34:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #6551AA | 3.31:1 | AA large text | Lc 22.7 | Dividers and decoration only |
| #6551AA text on white | 6.34:1 | AA | Lc 81.3 | Fine for body text |
| #6551AA text on black | 3.31:1 | AA large text | Lc -20.5 | 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#E9E8F6
oklch(93.6% 0.019 289.3)
-
Step 200
200
#D9D5F0
oklch(88.4% 0.037 292.4)
-
Step 300
300
#C0BAE9
oklch(81% 0.066 290.7)
-
Step 400
400
#A195DE
oklch(70.8% 0.106 291)
-
Step 500
500
#8B79D5
oklch(63.2% 0.136 291)
-
Step 600
600
#7560C2
oklch(55.6% 0.147 290.7)
-
Step 700
700 (this color)
#6551AA
oklch(49.9% 0.137 290.9)
-
Step 800
800
#504188
oklch(42.7% 0.114 290.5)
-
Step 900
900
#42386C
oklch(37.7% 0.087 290.5)
-
Step 950
950
#272140
oklch(27.1% 0.057 291)
#6551AA 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) | #2B61AD | 0.078 |
| Deuteranopia (no green cones) | #2E5EA8 | 0.075 |
| Tritanopia (no blue cones) | #526376 | 0.111 |
| Achromatopsia (no color) | #5F5F5F | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6551AA
#6551AA
oklch(49.9% 0.137 290.9)
- #666800
#666800
oklch(49.9% 0.11 111.1)
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 #6551AA, closest first.
No curated palette has a color within ΔE 0.04 of #6551AA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.043
- Slate Blue #6A5ACD ΔE 0.058
- Bluey Purple #6241C7 ΔE 0.060
- Light Indigo #6D5ACF ΔE 0.062
- Twilight #4E518B ΔE 0.063
- Dark Periwinkle #665FD1 ΔE 0.067
- Dusky Blue #475F94 ΔE 0.069
- Rebecca Purple #663399 ΔE 0.071
Use #6551AA 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.