Can I add a carousel slider to Squarespace?

Yes. Use Code Injection to add the script tag site-wide, then add a Code Block (set to HTML) on any page with your carousel markup. Requires Core plan or higher on new Squarespace plans.

What Squarespace plan do I need for a carousel?

You need a Core plan ($23/mo) or higher on new plans, or Business plan ($33/mo) or higher on legacy plans. Basic and Personal plans do not support JavaScript execution in Code Blocks.

Does the carousel work with Squarespace 7.0?

Yes, but if you have Ajax loading enabled on 7.0, the carousel may break on page navigation. Disable it in Design > Site Styles. Squarespace 7.1 does not have this issue.

Squarespace Carousel - How to Add a Custom Slider