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As of 2026-09-14, 34 Squarespace themes have been tested with Google Lighthouse on their own demo stores; 26 (76%) score 90 or better for mobile accessibility. The highest is Carroll by Squarespace at 96, then Oranssi by Squarespace at 96, and Amal by Squarespace at 96.

Squarespace themes ranked by mobile accessibility

Fastest themes on mobile
Each row shows six scores — speed, SEO and accessibility, measured on mobile, then the same three on desktop. 90good 50needs work 30poor –not measured Hover any score for what it measures. Bands are Lighthouse's own: 90+, 50–89, under 50.
Presets MobileDesktop

Questions people ask

What is the fastest Squarespace theme in 2026?

On 2026-09-14, the highest mobile accessibility score among the 34 Squarespace themes we have tested is Carroll by Squarespace at 96 out of 100, measured with Google Lighthouse on its demo store. Rankings change as themes are re-tested, so the live table above is the current answer.

How are Squarespace themes tested?

Each theme's own demo store is run through Google's PageSpeed Insights API (Lighthouse) on mobile and desktop, for the home page and, where the platform has them, a collection page and a product page. A theme's headline score is the median of its presets; a preset's is the mean of its pages. Every run is kept, so scores have a history and are re-measured continuously.

What is a good Lighthouse score for a Squarespace theme?

Google's bands are 90–100 good, 50–89 needs improvement, 0–49 poor. The median mobile accessibility score across tested Squarespace themes is 94, and 26 of 34 (76%) reach 90 or better. Mobile scores run well below desktop for the same theme because Lighthouse simulates a mid-range phone on a slow connection.