Costello Dark
Costello Dark is a WordPress theme by Catch Themes (Free). Tested on 2026-09-13 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 90 for mobile speed and 99 for desktop speed, 45/45 for SEO and 82/91 for accessibility (mobile/desktop, 0–100).
Mobile90
Desktop99
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 90 | 99 |
| SEO | 45 | 45 |
| Accessibility | 82 | 91 |
| Best practices | 100 | 100 |
Single preset · measured 2 times since 2026-09-13 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Costello Dark home page
Mobile
Speed 90 · 10 points to gain
- −4.5 Largest Contentful Paint medium effort
- −4 First Contentful Paint medium effort
- −0.8 Cumulative Layout Shift medium effort
- 150 ms Reduce unused CSS high effort
SEO 45 · 55 points to gain
- −36.6 Page is blocked from indexing low effort
- −9.1 Document does not have a meta description low effort
- −9.1 Image elements do not have `[alt]` attributes low effort
Accessibility 82 · 18 points to gain
- −6.7 Buttons do not have an accessible name medium effort
- −6.7 Image elements do not have `[alt]` attributes low effort
- −4.7 Background and foreground colors do not have a sufficient contrast ratio. medium effort
Desktop
SEO 45 · 55 points to gain
- −36.6 Page is blocked from indexing low effort
- −9.1 Document does not have a meta description low effort
- −9.1 Image elements do not have `[alt]` attributes low effort
Accessibility 91 · 9 points to gain
- −5.4 Image elements do not have `[alt]` attributes low effort
- −3.8 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 | ||||||
| Costello Dark default demo ↗ | 90 | 45 | 82 | 99 | 45 | 91 | 2026-09-13 |
| home ↗ | 90 | 45 | 82 | 99 | 45 | 91 | 2026-09-13 |
Show this score on your site
A live badge: it always shows Costello Dark's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/wordpress/costello-dark"><img src="https://themestested.com/badge/wordpress/costello-dark.svg" alt="Costello Dark speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.