#646691
Closest named color: Metallic Blue (#4F738E). oklch(52.6% 0.067 281.8), rgb(100, 102, 145).
Aa
White text reads best on this color (5.45:1).
About this color
#646691 is a medium-dark, muted purple. In OKLCH its lightness is 53%, its chroma 0.067 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.046 away. White text reads best on it, at 5.45:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.85:1 |
| White text | 5.45:1 |
Values
| HEX | #646691 |
| RGB | rgb(100, 102, 145) |
| HSL | hsl(237, 18%, 48%) |
| OKLCH | oklch(52.6% 0.067 281.8) |
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 #646691 | 5.45:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #646691 | 3.85:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #646691 text on white | 5.45:1 | AA | Lc 77.2 | Fine for body text |
| #646691 text on black | 3.85:1 | AA large text | Lc -24.6 | 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 600.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E9E9F0
oklch(93.6% 0.009 286.2)
-
Step 200
200
#D7D8E4
oklch(88.5% 0.016 282.2)
-
Step 300
300
#BDBFD4
oklch(81% 0.029 281.4)
-
Step 400
400
#9B9DBF
oklch(70.6% 0.049 282.4)
-
Step 500
500
#8385AF
oklch(63.1% 0.063 282.3)
-
Step 600
600 (this color)
#646691
oklch(52.6% 0.067 281.8)
-
Step 700
700
#5B5C84
oklch(49% 0.064 282.7)
-
Step 800
800
#4A4C6B
oklch(42.8% 0.051 281.1)
-
Step 900
900
#3E3F57
oklch(37.7% 0.041 282.4)
-
Step 950
950
#242533
oklch(27% 0.026 281.3)
#646691 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) | #5A6B93 | 0.018 |
| Deuteranopia (no green cones) | #586890 | 0.018 |
| Tritanopia (no blue cones) | #596E75 | 0.060 |
| Achromatopsia (no color) | #696969 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646691
#646691
oklch(52.6% 0.067 281.8)
- #726C3D
#726C3D
oklch(52.5% 0.067 102)
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 #646691, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.046
- Dusky Blue #475F94 ΔE 0.048
- Dull Blue #49759C ΔE 0.050
- Dusty Purple #825F87 ΔE 0.050
- Muted Purple #805B87 ΔE 0.051
- Grey Purple #826D8C ΔE 0.054
- Dark Lavender #856798 ΔE 0.054
- Muted Blue #3B719F ΔE 0.055
Use #646691 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.