#6551CC
Closest named color: Iris (#6258C4). oklch(52.3% 0.182 285.7), rgb(101, 81, 204).
Aa
White text reads best on this color (5.82:1).
About this color
#6551CC is a medium-dark, vivid purple. In OKLCH its lightness is 52%, its chroma 0.182 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.021 away. White text reads best on it, at 5.82:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.60:1 |
| White text | 5.82:1 |
Values
| HEX | #6551CC |
| RGB | rgb(101, 81, 204) |
| HSL | hsl(250, 55%, 56%) |
| OKLCH | oklch(52.3% 0.182 285.7) |
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 #6551CC | 5.82:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #6551CC | 3.60:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #6551CC text on white | 5.82:1 | AA | Lc 78.8 | Fine for body text |
| #6551CC text on black | 3.60:1 | AA large text | Lc -23.0 | 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
#F4F4FD
oklch(97% 0.012 286.2)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D5D5F9
oklch(88.4% 0.049 285.3)
-
Step 300
300
#BBB9F8
oklch(81% 0.088 285.7)
-
Step 400
400
#9992F4
oklch(70.7% 0.141 285.5)
-
Step 500
500
#8373F0
oklch(63.1% 0.181 285.8)
-
Step 600
600
#6E58DE
oklch(55.6% 0.196 285.6)
-
Step 700
700 (this color)
#6551CC
oklch(52.3% 0.182 285.7)
-
Step 800
800
#4B3B9C
oklch(42.7% 0.151 285.6)
-
Step 900
900
#3E347C
oklch(37.7% 0.118 285.6)
-
Step 950
950
#241F49
oklch(27% 0.075 285.6)
#6551CC 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) | #0068D0 | 0.093 |
| Deuteranopia (no green cones) | #0061C9 | 0.091 |
| Tritanopia (no blue cones) | #3F6E87 | 0.152 |
| Achromatopsia (no color) | #656565 | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6551CC
#6551CC
oklch(52.3% 0.182 285.7)
- #736D00
#736D00
oklch(52.3% 0.112 105.9)
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 #6551CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.021
- Slate Blue #6A5ACD ΔE 0.023
- Light Indigo #6D5ACF ΔE 0.026
- Dark Periwinkle #665FD1 ΔE 0.033
- Bluey Purple #6241C7 ΔE 0.035
- Warm Blue #4B57DB ΔE 0.044
- Blue With A Hint Of Purple #533CC6 ΔE 0.057
- Blurple #5539CC ΔE 0.059
Use #6551CC 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.