MasterBox
MasterBox is a Webflow theme by Templates ($99). Tested on 2026-09-30 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 61 for mobile speed and 97 for desktop speed, 91/91 for SEO and 87/87 for accessibility (mobile/desktop, 0–100).
Mobile61
Desktop97
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 61 | 97 |
| SEO | 91 | 91 |
| Accessibility | 87 | 87 |
| Best practices | 100 | 100 |
Single preset · measured 2 times since 2026-09-30 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — MasterBox home page
Mobile
Speed 61 · 39 points to gain
- −24.3 Largest Contentful Paint medium effort
- −9.5 First Contentful Paint medium effort
- −5 Speed Index medium effort
SEO 91 · 9 points to gain
- −9.1 Links do not have descriptive text low effort
Accessibility 87 · 13 points to gain
- −3.4 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −3.4 `<html>` element does not have a `[lang]` attribute low effort
- −3.4 Links do not have a discernible name medium effort
- −1.5 Heading elements are not in a sequentially-descending order medium effort
- −1.5 Document does not have a main landmark. medium effort
Desktop
Speed 97 · 3 points to gain
- −1.7 Largest Contentful Paint medium effort
- −0.7 First Contentful Paint medium effort
SEO 91 · 9 points to gain
- −9.1 Links do not have descriptive text low effort
Accessibility 87 · 13 points to gain
- −3.4 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −3.4 `<html>` element does not have a `[lang]` attribute low effort
- −3.4 Links do not have a discernible name medium effort
- −1.5 Heading elements are not in a sequentially-descending order medium effort
- −1.5 Document does not have a main landmark. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| MasterBox default demo ↗ | 61 | 91 | 87 | 97 | 91 | 87 | 2026-09-30 |
| home ↗ | 61 | 91 | 87 | 97 | 91 | 87 | 2026-09-30 |
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<a href="https://themestested.com/theme/webflow/masterbox-education-website-template"><img src="https://themestested.com/badge/webflow/masterbox-education-website-template.svg" alt="MasterBox speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.