Cosmic Themes
Cosmic Themes has 20 themes tested on Themestested, for Astro. Their median Google Lighthouse mobile speed score is 99 (desktop 100), with 17 of 20 scoring 90 or better on mobile. The fastest on mobile is Blogsmith Free at 100. Last measured 2026-09-12, on each theme's own demo store.
| Theme | Platform | Price | Mobile · speed SEO a11y | Desktop · speed SEO a11y | Tested |
|---|---|---|---|---|---|
| Blogsmith Free | Astro | Free | 100100100 | 100100100 | 2026-09-12 |
| Blogsmith Pro | Astro | Paid | 100100100 | 100100100 | 2026-09-12 |
| Cosmic Eclipse | Astro | Paid | 10010096 | 10010096 | 2026-09-12 |
| Landing Pad | Astro | Free | 100100100 | 99100100 | 2026-09-12 |
| Pathfinder | Astro | Paid | 100100100 | 100100100 | 2026-09-12 |
| The Starter | Astro | Paid | 100100100 | 100100100 | 2026-09-12 |
| Constellation | Astro | Paid | 99100100 | 100100100 | 2026-09-12 |
| Galaxy | Astro | Paid | 99100100 | ––– | 2026-09-12 |
| Northstar | Astro | Paid | 9910095 | 10010095 | 2026-09-12 |
| Quantum thin demo | Astro | Paid | 99100100 | ––– | 2026-09-12 |
| Voyager | Astro | Paid | 999291 | 1009287 | 2026-09-12 |
| Solstice | Astro | Paid | 98100100 | 99100100 | 2026-09-12 |
| Space Coast | Astro | Paid | 9892100 | 9992100 | 2026-09-12 |
| Nova | Astro | Paid | 96100100 | 99100100 | 2026-09-12 |
| Horizon | Astro | Free | 9410096 | 10010096 | 2026-09-12 |
| The Void | Astro | Paid | 93100100 | 9910096 | 2026-09-12 |
| Zenith | Astro | Paid | 9110097 | 10010097 | 2026-09-12 |
| Dawnlight | Astro | Paid | 749295 | ––– | 2026-09-12 |
| Atlas | Astro | Paid | ––– | 10010095 | 2026-09-12 |
| Stellar | Astro | Paid | ––– | 10010095 | 2026-09-12 |
Sorted by mobile speed. Each theme's score is the median of its tested presets; open a theme for its pages, history and the audits behind the number.
Show your scores
Any of these themes can carry its live score on your own site. The badge is an image that always shows the current number, links back to the theme's page here, and updates as the theme is re-tested.
<a href="https://themestested.com/theme/astro/blogsmith-free"><img src="https://themestested.com/badge/astro/blogsmith-free.svg" alt="Blogsmith Free speed score on Themestested" height="20"></a>
Swap the theme in the address for any of yours. Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.