Kepler
Kepler is a Astro theme by kpab (Free). Tested on 2026-10-12 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 93 for mobile speed and 99 for desktop speed, 92/92 for SEO and 93/93 for accessibility (mobile/desktop, 0–100). Note: its demo home page is light — 65 KB in 5 requests — where a stocked storefront is usually 1–4 MB, so the speed score flatters it.
Mobile93
Desktop99
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 93 | 99 |
| SEO | 92 | 92 |
| Accessibility | 93 | 93 |
| Best practices | 100 | 100 |
Single preset · measured 4 times since 2026-10-12 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Kepler home page
Mobile
Speed 93 · 7 points to gain
- −3.5 First Contentful Paint medium effort
- −3 Largest Contentful Paint medium effort
SEO 92 · 8 points to gain
- −8.3 robots.txt is not valid outside the theme
Accessibility 93 · 7 points to gain
- −4.9 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −2.1 Document does not have a main landmark. medium effort
Desktop
SEO 92 · 8 points to gain
- −8.3 robots.txt is not valid outside the theme
Accessibility 93 · 7 points to gain
- −4.9 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −2.1 Document does not have a main landmark. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Kepler default demo ↗ | 93 | 92 | 93 | 99 | 92 | 93 | 2026-10-12 |
| home ↗ | 93 | 92 | 93 | 99 | 92 | 93 | 2026-10-12 |
Show this score on your site
A live badge: it always shows Kepler's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/astro/kepler"><img src="https://themestested.com/badge/astro/kepler.svg" alt="Kepler speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.