Add an official `vertical_slider` widget

[diogo-rossi]

Checklist

• I have searched the existing issues for similar feature requests.
• I added a descriptive title and summary to this issue.

Summary

Hello everyone, thanks for this great framework.

I would like to request the addition of an built-in native vertical_slider component widget.

I great alternative has already been made as a third-party custom component by @sfc-gh-cserrano:

• Streamlit discuss post
• Github repository

However, custom components have some limitations. It would be nice if the vertical slider behaves the same as the normal slider widget.

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[github-actions]

This is a feature request to add a native vertical_slider widget to Streamlit. The author notes that a third-party custom component (streamlit-vertical-slider) already exists but has inherent limitations of custom components (e.g., no seamless session state integration, different serialization behavior, no native theming). The request is for an official built-in widget that behaves identically to st.slider but renders vertically. This follows a broader pattern of users requesting vertical orientation options for existing widgets.

Related Issues

• Vertical st.segmented_control #11972 Vertical st.segmented_control — Same pattern: requesting a vertical layout option for an existing horizontal widget. Shows broader user demand for vertical widget orientations.
• st.segmented_control: Add vertical option #10017 st.segmented_control: Add vertical option — Another request for a vertical variant of a widget, further reinforcing the pattern of needing vertical layout options across Streamlit widgets.
• Histogram slider #6134 Histogram slider — A request for a specialized slider variant (histogram overlay), similar in spirit to this request for a layout variant of the slider widget.

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