AuditJet vs Vercel Speed Insights
AuditJet is platform-agnostic, adds synthetic monitoring, revenue intelligence, and works beyond the Vercel ecosystem.
What is Vercel Speed Insights?
Vercel Speed Insights is one of the slickest onboarding experiences in frontend performance monitoring. You install the `@vercel/speed-insights` package, add `<SpeedInsights />` to your root layout, and within a few minutes you have a real-time dashboard showing Core Web Vitals data from actual users — segmented by page route, country, and device type. For a Next.js team shipping frequently on Vercel, it's the lowest-friction way to get RUM data.
The critical limitation is architectural: Speed Insights is Real User Monitoring only. It shows you what real users experienced after they visited your site. It does not run synthetic Lighthouse scans on a schedule, which means it cannot alert you to a regression until enough real users have experienced it to move the p75 score. For a low-traffic page that you just deployed a CLS-causing change to, you might wait hours or days before Speed Insights shows a score change — while Google's crawler is already indexing the degraded experience.
The other constraint is platform lock-in. Vercel Speed Insights only works for sites deployed on Vercel's infrastructure. If you use Cloudflare Pages, AWS Amplify, Netlify, or your own servers for any part of your stack, that traffic isn't captured. AuditJet's synthetic monitoring and RUM snippet work on any publicly accessible URL, regardless of where it's hosted — and it adds revenue impact modelling, Slack alerting, and AI-generated fix suggestions that Speed Insights doesn't provide.
Pricing note: Vercel Speed Insights: free up to 10,000 data points/month on Hobby plan. Pro plan ($20/month per member) includes 100,000 data points. Enterprise pricing varies. AuditJet is free for up to 3 pages with synthetic monitoring included.
Side-by-Side Comparison
| Feature | AuditJet | Vercel Speed Insights |
|---|---|---|
| Real User Monitoring (RUM) | ||
| Synthetic Lighthouse monitoring | ||
| Regression alerts (threshold-based) | ||
| Revenue impact per regression | ||
| Works on any host (not Vercel-only) | ||
| AI fix suggestions | ||
| Slack / email alerting | ||
| Deploy-correlated regression detection | Partial (Vercel deploys only) | |
| Route-level segmentation | ||
| Free tier | 3 pages, unlimited scans | 10k data points/month |
Limitations of Vercel Speed Insights
Vercel Speed Insights shows you what real users experienced. By the time a CLS or LCP regression appears in the Speed Insights dashboard at a statistically significant level, hundreds or thousands of users have already experienced the degraded page. Synthetic monitoring catches the same regression within 15 minutes of deployment — before any real user is affected.
Speed Insights does not send notifications when a route's p75 LCP crosses 2.5 seconds or its CLS crosses 0.1. You have to check the dashboard manually. There is no Slack integration, no webhook, no email alert for performance regressions. For teams that ship daily, this means regressions accumulate silently between manual reviews.
The `@vercel/speed-insights` package only reports data for deployments on Vercel's edge network. If your API is on AWS, your media served from Cloudflare, or a legacy page on a different host, that traffic is invisible to Speed Insights. Teams running multi-cloud or hybrid infrastructure get an incomplete picture.
RUM requires real user traffic to produce meaningful p75 scores. For low-traffic pages — internal tools, B2B dashboards, checkout success pages — Speed Insights may show 'Not enough data' for weeks. Synthetic monitoring runs on a schedule regardless of traffic volume, making it the only reliable approach for low-traffic URLs.
Why teams choose AuditJet over Vercel Speed Insights
Two lines of code — install the package, add the component — gives you production RUM data with route-level breakdown. For a Next.js team on Vercel who needs RUM quickly and doesn't want to manage a separate monitoring tool, this is genuinely the fastest path to field data.
Speed Insights can show performance data segmented by deployment, so you can compare p75 LCP on the latest production deploy against the previous one. This is a useful signal when you're trying to attribute a score change to a specific release.
Unlike some RUM tools that sample a percentage of sessions, Vercel Speed Insights captures every page load (up to plan limits). For high-traffic sites this means the p75 scores are based on actual complete datasets rather than extrapolations.
When to choose each
Use Vercel Speed Insights if you need zero-config RUM for a Next.js project on Vercel and you're comfortable checking the dashboard manually. It's a great first step into real-user data and adds no operational overhead.
Choose AuditJet (alongside Speed Insights, not instead of it) when you need proactive regression alerting, synthetic monitoring for low-traffic pages, revenue impact quantification, or monitoring for URLs outside the Vercel ecosystem. The two tools are complementary.
AuditJet vs Vercel Speed Insights — FAQ
What's the difference between Vercel Speed Insights and AuditJet?
Vercel Speed Insights is Real User Monitoring: it reports what actual visitors experienced on your Vercel-hosted site. AuditJet is primarily synthetic monitoring: it runs scheduled Lighthouse scans and alerts you when scores regress. AuditJet also offers RUM via a snippet that works on any host. The two tools are complementary — Speed Insights gives you field data from real users; AuditJet catches regressions before real users encounter them.
Does Vercel Speed Insights alert me when my Core Web Vitals regress?
No — Vercel Speed Insights does not send threshold-based alerts. You have to check the dashboard manually to notice score changes. AuditJet monitors your pages every 15 minutes and sends Slack or email alerts when any CWV metric crosses your configured threshold.
Can I use AuditJet with Vercel?
Yes — AuditJet monitors any publicly accessible URL regardless of where it's hosted. Many teams run both: Vercel Speed Insights for real-user field data and AuditJet for synthetic regression alerting. AuditJet can detect deploy-correlated regressions within 15 minutes of a new Vercel deployment going live.
Does Vercel Speed Insights work outside of Vercel?
No — the @vercel/speed-insights package only reports data for sites deployed on Vercel's infrastructure. If you're using any other hosting provider, you need a host-agnostic RUM solution. AuditJet's RUM snippet works on any site regardless of hosting platform.
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