Hart
Hart is a Squarespace theme by Squarespace (Free). Tested on 2026-09-14 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 60 for mobile speed and 97 for desktop speed, 85/92 for SEO and 94/96 for accessibility (mobile/desktop, 0–100).
Mobile60
Desktop97
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 60 | 97 |
| SEO | 85 | 92 |
| Accessibility | 94 | 96 |
| Best practices | 100 | 100 |
Single preset · measured 2 times since 2026-09-14 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Hart home page
Mobile
Speed 60 · 40 points to gain
- −24.8 Largest Contentful Paint medium effort
- −8.2 First Contentful Paint medium effort
- −4.4 Speed Index medium effort
- −3 Total Blocking Time medium effort
- 2.0 s Reduce unused JavaScript high effort
- 750 ms Reduce unused CSS high effort
SEO 85 · 15 points to gain
- −7.7 Document does not have a meta description low effort
- −7.7 robots.txt is not valid outside the theme
Accessibility 94 · 6 points to gain
- −5.6 Background and foreground colors do not have a sufficient contrast ratio. medium effort
Desktop
Speed 97 · 3 points to gain
- −2.7 Largest Contentful Paint medium effort
- 120 ms Reduce unused CSS high effort
- 120 ms Reduce unused JavaScript high effort
SEO 92 · 8 points to gain
- −7.7 Document does not have a meta description low effort
Accessibility 96 · 4 points to gain
- −4.4 Background and foreground colors do not have a sufficient contrast ratio. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Hart default demo ↗ | 60 | 85 | 94 | 97 | 92 | 96 | 2026-09-14 |
| home ↗ | 60 | 85 | 94 | 97 | 92 | 96 | 2026-09-14 |
Show this score on your site
A live badge: it always shows Hart's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/squarespace/hart-fluid-demo"><img src="https://themestested.com/badge/squarespace/hart-fluid-demo.svg" alt="Hart speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.