- Requires an active Will's Toolkit membership, not a one-off purchase
- Custom CSS needs a Squarespace Business plan or higher
- CSS over native markup may need adjusting after Squarespace updates
- Squarespace 7.1 only
Overview
This is not a standalone plugin. Slideshow Testimonial Style is a code snippet inside Will's Toolkit, the membership run by Squarespace developer Will Myers, and you need an active Toolkit subscription to open it. What the snippet does is restyle a native Squarespace list section (set to its carousel layout) into a full-width testimonial slideshow: a large image on one side, a coloured card with the person's name, their quote and a button on the other, with circular previous and next arrows below. The content stays in Squarespace's own list section, so clients edit testimonials exactly as they would any other list item.
What it includes
A CSS snippet with copy buttons, tagged in the Toolkit catalogue under List Section and Testimonials, last updated in April 2025 according to the listing. Because it is CSS over a native section, it inherits your site's fonts and colour theme, and the card colour, radius and spacing follow the usual custom CSS pattern. The membership itself includes the full Code Catalog of over a hundred snippets, the Toolkit browser extension, the Robo-Will AI assistant, a Slack community and a discount on Will's standalone plugins.
Who it suits
Designers who build several Squarespace sites a year and want a library of tested customisations rather than a one-off purchase, and site owners comfortable pasting CSS who want a testimonial slideshow that stays fully editable through the native list section.
Trade-offs
You are subscribing to a membership, not buying a plugin, so if you only want this one effect the maths may not work. Custom CSS requires a Squarespace Core plan or higher (Business or Commerce on older plans). And because the styling targets Squarespace's own list section classes, it can need a tweak when Squarespace changes their markup, which is the reason the Toolkit exists in the first place.
How it installs
Add a list section to your page, switch it to the carousel layout and add your testimonials as list items with an image, title, description and button. Copy the snippet from the Toolkit catalogue into Design, Custom CSS, and adjust the section ID or colour variables as the snippet notes instruct.
Related guide: How to use custom CSS in Squarespace and Best Squarespace plugins in 2026.
- Turns a list section carousel into a designed testimonial slideshow
- Keeps content in Squarespace's native list section
- Adds styled navigation arrows and a coloured quote card
Full specifications
Specifications
Keeps content in squarespace's native list section
Adds styled navigation arrows and a coloured quote card
Image, coloured card, name, quote, button and circular arrows
Testimonials stay editable as ordinary list items
Css only, inherits site fonts and colour theme
Part of the will's toolkit code catalog
Site owners comfortable pasting custom css
Testimonial sections that must stay editable by the client
Toolkit members wanting a designed alternative to the default carousel
Custom css needs a squarespace business plan or higher
Css over native markup may need adjusting after squarespace updates
Squarespace 7.1 only
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