Frontend performance monitoring is the difference between guessing and knowing. We compare LogRocket, Sentry, Bugsnag, and GlitchTip across session replay, error tracking, Core Web Vitals, and pricing — so you can pick the right tool for your stack.
Your web app loads fast in your dev environment. But what about on a mid-range Android phone in a coffee shop with spotty Wi-Fi? That's the gap frontend performance monitoring is meant to close.
There are two main approaches: Real User Monitoring (RUM) collects data from actual visitors — their devices, network conditions, and interactions. Synthetic monitoring runs scripted tests from controlled environments to establish baselines. You need both to understand what's really happening.1
Core Web Vitals — LCP, FID/INP, CLS — are the language browsers and search engines use to measure user experience. Monitoring them in production gives you the signal to fix what matters before users bounce.2
Here are the tools that do it best.
| Tool | Best For | Pricing Model |
|---|---|---|
| LogRocket | Session replay + performance | Session-based, free tier |
| Sentry | Error tracking + transaction tracing | Event-based, generous free tier |
| Bugsnag | Stability scores & error prioritization | Event-based, free tier |
| GlitchTip | Open-source error & uptime monitoring | Self-hosted (free) or cloud |
LogRocket is the closest thing to sitting next to your user and watching them use your app. It records every interaction — clicks, scrolls, network requests — and overlays performance data like Core Web Vitals, JS errors, and console logs.1
What makes it powerful: you can replay a session where LCP spiked and see exactly what the user did, what assets loaded, and where the bottleneck was. It's RUM with a DVR.
Pricing: Free tier includes 1,000 sessions/month. Paid plans start at $99/month for 5,000 sessions.
Best for: Teams debugging UX-specific performance issues where context is everything.
Sentry started as the gold standard for error tracking and has grown into a full performance monitoring platform. It captures exceptions with full stack traces and now offers distributed transaction tracing — so you can see how a slow database query on the backend caused a poor LCP on the frontend.2
Its performance feature, Sentry Tracing, connects frontend spans (page load, XHR) to backend spans (API calls, DB queries) in a single view. This makes it the best choice for full-stack teams.
Pricing: Free tier includes 5,000 errors/month and 10,000 performance transactions/month. Team plan starts at $26/month.
Best for: Full-stack teams that need error and performance data in one place.
Bugsnag takes a slightly different approach: instead of flooding you with every error, it surfaces the ones that actually affect users. Its stability score — the percentage of sessions free of errors — gives you a single number to track over time.1
It also groups errors intelligently, so you're not chasing duplicates. For teams that want to prioritize fixes by user impact rather than raw error count, Bugsnag is a strong choice.
Pricing: Free tier includes 7,500 errors/month. Pro starts at $49/month.
Best for: Teams that want to focus on the errors that matter most to users.
GlitchTip is an open-source error and uptime monitoring tool that's API-compatible with Sentry's SDK. That means you can use Sentry's client libraries and point them at your own GlitchTip instance.1
It's lightweight, self-hostable, and covers the basics: error grouping, release tracking, and uptime checks. You won't get advanced session replay or deep transaction tracing, but for teams on a budget or with strict data sovereignty requirements, it's a solid pick.
Pricing: Self-hosted is free. Cloud plans start at $15/month.
Best for: Budget-conscious teams or those who need to keep data on-premise.
Most teams end up combining two tools — one for session replay (LogRocket) and one for error tracking (Sentry or Bugsnag). That's a reasonable stack.1
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