# Overlay chart

Combine line charts, bar charts and categorical scatter plots on the same chart. The overlay plot will not mandate using the same set of axes, but using consistent categories is recommended.

If the x-axis is a time axis, the overlay plot also supports drawing vertical lines at input time variables.

## Input type

Categorical chart

## Output type

Object selection

## Usage information

| Functionality | Availability |
| --- | --- |
| [Standard Quiver card](../core-concepts/index.md#cards) | Supported |
| [Transform table transform](../cards-transform-table/index.md) | Unsupported |