Zen
Zen is a Astro theme by F0rmat (Free). Tested on 2026-09-12 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 81 for mobile speed and 98 for desktop speed, 100/100 for SEO and 95/95 for accessibility (mobile/desktop, 0–100).
Mobile81
Desktop98
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 81 | 98 |
| SEO | 100 | 100 |
| Accessibility | 95 | 95 |
| Best practices | 100 | 100 |
Single preset · measured 2 times since 2026-09-12 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Zen home page
Mobile
Speed 81 · 19 points to gain
- −10.3 Largest Contentful Paint medium effort
- −7 First Contentful Paint medium effort
- −1.4 Speed Index medium effort
- 750 ms Reduce unused CSS high effort
Accessibility 95 · 5 points to gain
- −4.6 Background and foreground colors do not have a sufficient contrast ratio. medium effort
Desktop
Speed 98 · 2 points to gain
- −0.8 First Contentful Paint medium effort
- −0.8 Largest Contentful Paint medium effort
- 120 ms Reduce unused CSS high effort
Accessibility 95 · 5 points to gain
- −4.6 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 | ||||||
| Zen default demo ↗ | 81 | 100 | 95 | 98 | 100 | 95 | 2026-09-12 |
| home ↗ | 81 | 100 | 95 | 98 | 100 | 95 | 2026-09-12 |
Show this score on your site
A live badge: it always shows Zen's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/astro/zen"><img src="https://themestested.com/badge/astro/zen.svg" alt="Zen speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.