Website bugs and reliability
Do the pages and journeys that matter actually work? We look at loading errors, broken links and resources, error pages, mobile behavior, and the key journeys: contact, quote and purchase.
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One page. One pillar. A real report.
Enter your website and we’ll email you a report on User experience & reliability for your home page. Please allow at least 24 hours.
Our plans cover the 9 pillars across the pages of your whole site.
What we check
- The errors that really happen in your pages during loading, and the resources that fail to load.
- What happens when a non-existent URL is requested: a page that brings the visitor back into your site, or a dead end.
- The site at three screen widths, rather than a simple “mobile-friendly” verdict. A button can be pushed off screen with no horizontal scrolling to signal it, because the overflow is hidden. Where that happens, we measure the exact range of widths at which the control is out of reach.
- The controls we actually operate, where that can be done without changing anything on your site: a button that triggers nothing is a silent failure, invisible on a screenshot.
- Navigation, visual hierarchy, and the journeys your business depends on: contact, quote, purchase.
What we find on the sites we audit
Across about 30 websites we audited between August 14, 2026 and September 24, 2026:
- 55% throw JavaScript errors as soon as the page loads
Each percentage covers the sites where the point could be checked. Many were audited because a defect showed up quickly, so these figures describe our audits, not websites in general.
See also: website speed and Core Web Vitals; website accessibility audit.
On what basis
no dedicated standard: measured facts and human review
A finding is only worth something if it rests on an identifiable basis. Where one exists, we rely on a law, a standard or a specification, and for every point recorded the report names the page and gives the value we measured.
This pillar is the only one with no dedicated standard, and the report says so plainly. It rests on measured facts (an error that occurs, a resource that fails to load, a button out of reach) and on human review. We would rather leave that field empty than cite an approximate reference.
What it changes for you
A journey problem can remain invisible to a site owner who follows the same path on the same device. A new visitor can still encounter a fault that no dashboard reports.
The weight of this pillar
An overall score has to weigh what matters for your business: the 9 pillars do not carry the same weight depending on what your site is for. Here is what “user experience & reliability” represents in the overall score, under each weighting. The report always states which one produced your score.
| Type of site | Share of the overall score |
|---|---|
| Type not determined | 10% |
| Business / brochure site | 10% |
| E-commerce site | 12% |
| Application / customer portal | 11% |
| Blog / media site | 8% |
| Public-sector site | 8% |
This pillar is examined alongside the other eight in every plan, whatever the number of pages. See pricing →
Guides for this pillar
JavaScript console errors: which to fix
A JavaScript error can disable a menu, a form or a checkout, or change nothing at all. How to tell which console errors to fix first, and what to ask for.
Read the guide →Website images not showing: what to fix
An image that's missing for every visitor comes from your site, not their browser. Why you don't see it yourself, and what to ask for to get it fixed.
Read the guide →