AuditJet vs Semrush Site Audit
AuditJet provides continuous real-time CWV monitoring with revenue impact — Semrush's performance features are supplemental to its core SEO toolset.
What is Semrush Site Audit?
Semrush is one of the most widely used SEO platforms in the industry, and for good reason: its keyword database, backlink analysis, and competitor research tools are genuinely best-in-class. The Site Audit module, which crawls your site on a schedule and flags performance issues, has improved substantially over the past few years and now surfaces Core Web Vitals scores alongside technical SEO issues like broken links, duplicate content, and crawl depth.
The limitation isn't Semrush's ambition — it's the architecture. Site Audit is a crawler-based tool that runs on a weekly or daily crawl cycle. It samples pages by crawling them via a bot, not by loading them as a real user in a browser. As a result, the CWV scores it reports come from a lab simulation of a crawl, not a full Lighthouse run with all third-party scripts loaded. For a homepage with a cookie consent banner, a chat widget, and a retargeting pixel, the score Semrush reports can differ substantially from what Google sees when it runs a real Lighthouse audit.
If you're already paying for Semrush ($120–$450/month depending on plan), the performance data it surfaces is worth reviewing — but it isn't a substitute for continuous synthetic monitoring with alerting. AuditJet runs full Lighthouse scans every 15 minutes, loads your page exactly as a user does (with all scripts, fonts, and third-party tags), and alerts you when a score crosses your threshold — with the estimated revenue cost of that regression calculated automatically.
Pricing note: Semrush Pro: $139.95/month. Guru: $249.95/month. Business: $449.95/month. Site Audit is included in all plans. AuditJet is free for up to 3 pages.
Side-by-Side Comparison
| Feature | AuditJet | Semrush Site Audit |
|---|---|---|
| Continuous CWV monitoring | ||
| Full Lighthouse scan (all scripts loaded) | ||
| Real-time regression alerts | ||
| Revenue impact per regression | ||
| Real User Monitoring (RUM) | ||
| AI fix suggestions | ||
| Keyword research | ||
| Backlink analysis | ||
| Technical SEO crawl audit | CWV-focused | Full site audit |
| Monitoring frequency | Every 15 min | Daily or weekly crawl |
Limitations of Semrush Site Audit
Semrush Site Audit crawls pages as a bot. It does not execute all JavaScript the way a real browser does. This means third-party tags — analytics pixels, chat widgets, A/B testing scripts — are often not fully loaded when the CWV score is captured. The result is scores that are systematically more optimistic than what Google PageSpeed Insights or Lighthouse would report for the same page.
Even on Semrush's fastest crawl schedule, if a CWV regression is introduced on a Tuesday, you may not see it until the following Monday's crawl completes. For ecommerce sites where a 200ms LCP regression during peak trading costs measurable revenue, a 6-day detection window is unacceptable.
Semrush does not send alerts when a CWV score crosses a threshold. You have to log in, navigate to Site Audit, and compare the latest crawl against the previous one. There is no Slack integration, email alert, or webhook for performance regressions specifically.
The Site Audit module competes internally with Semrush's keyword, backlink, and content tools for feature roadmap priority. Performance monitoring improvements are incremental — the tool hasn't added RUM, revenue impact modelling, or AI diagnostics despite years of market demand.
Why teams choose AuditJet over Semrush Site Audit
If your team uses Semrush daily for keyword research and competitor analysis, the performance data is a free add-on that requires no additional tool or login. The CWV scores it surfaces are directionally useful for identifying pages that clearly need work.
Semrush can show a page's CWV score alongside its organic keyword rankings and estimated traffic. This cross-referencing — identifying which slow pages are also your highest-traffic pages — is a useful prioritisation signal that AuditJet doesn't replicate.
Semrush Site Audit flags hundreds of technical SEO issues beyond CWV: broken internal links, orphaned pages, missing canonical tags, hreflang errors, redirect chains. For sites that need both SEO auditing and performance monitoring, Semrush covers the audit side comprehensively.
When to choose each
Use Semrush if you already pay for it and primarily need SEO auditing (keyword research, backlinks, content gaps). The performance data it surfaces is a useful supplement to your main SEO workflow — just don't rely on it as your only performance signal.
Choose AuditJet if your primary goal is to catch performance regressions as they happen — not days later. If you deploy frequently, run A/B tests, or install third-party scripts, you need continuous monitoring with immediate alerting, not a weekly crawl.
AuditJet vs Semrush Site Audit — FAQ
Does Semrush monitor Core Web Vitals?
Yes — Semrush Site Audit includes Core Web Vitals scores as part of its performance reports. However, it runs on a crawl schedule (daily or weekly) rather than continuously, does not alert you on regression, and does not load all third-party scripts the way a real browser does. The scores are useful as a directional signal but aren't equivalent to a full Lighthouse audit.
Can I use Semrush and AuditJet together?
Yes. Many teams use Semrush for SEO keyword and backlink work, and AuditJet for continuous CWV monitoring and regression alerting. They solve complementary problems — Semrush audits site health weekly, AuditJet monitors performance every 15 minutes and alerts within one scan cycle of a regression.
Why are Semrush CWV scores different from Google PageSpeed Insights?
Semrush crawls pages as a bot without fully executing JavaScript, so third-party scripts that affect LCP, CLS, and INP may not load during its scan. Google PageSpeed Insights runs a full Lighthouse audit that loads scripts as a user would. The difference is most pronounced on pages with many third-party tags.
Does AuditJet replace Semrush?
No — AuditJet specialises in continuous Core Web Vitals monitoring, revenue impact modelling, and regression alerting. It does not offer keyword research, backlink analysis, or the broad technical SEO audit coverage that Semrush provides. If you need both, use both tools.
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