Jupiter
Jupiter is a Webflow theme by Templates ($99). Tested on 2026-09-29 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 58 for mobile speed and 81 for desktop speed, 100/100 for SEO and 87/87 for accessibility (mobile/desktop, 0–100). Note: its demo home page is heavy — 7.9 MB — heavier than a typical store, so the speed score may understate the theme.
Mobile58
Desktop81
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 58 | 81 |
| SEO | 100 | 100 |
| Accessibility | 87 | 87 |
| Best practices | 100 | 100 |
Single preset · measured 2 times since 2026-09-29 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Jupiter home page
Mobile
Speed 58 · 42 points to gain
- −25 Largest Contentful Paint medium effort
- −8.6 First Contentful Paint medium effort
- −8.4 Speed Index medium effort
- 300 ms Reduce unused JavaScript high effort
Accessibility 87 · 13 points to gain
- −3.3 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −3.3 `<html>` element does not have a `[lang]` attribute low effort
- −3.3 Links do not have a discernible name medium effort
- −1.4 Heading elements are not in a sequentially-descending order medium effort
- −1.4 Document does not have a main landmark. medium effort
Desktop
Speed 81 · 19 points to gain
- −16.3 Largest Contentful Paint medium effort
- −1.9 Speed Index medium effort
- −0.9 First Contentful Paint medium effort
Accessibility 87 · 13 points to gain
- −3.3 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −3.3 `<html>` element does not have a `[lang]` attribute low effort
- −3.3 Links do not have a discernible name medium effort
- −1.4 Heading elements are not in a sequentially-descending order medium effort
- −1.4 Document does not have a main landmark. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Jupiter default demo ↗ | 58 | 100 | 87 | 81 | 100 | 87 | 2026-09-29 |
| home ↗ | 58 | 100 | 87 | 81 | 100 | 87 | 2026-09-29 |
Show this score on your site
A live badge: it always shows Jupiter's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/webflow/jupiter-newsletter-website-template"><img src="https://themestested.com/badge/webflow/jupiter-newsletter-website-template.svg" alt="Jupiter speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.