Prompt
Can you recommend a real user monitoring platform for tracking frontend performance on a JavaScript-heavy web app?
Latest observation
Yes — for a JavaScript-heavy web app, I’d recommend Datadog Real User Monitoring (RUM) if you want a strong all-around platform, or Sentry Performance if you want something simpler and very developer-friendly.
Best overall: Datadog RUM
Why it fits:
- Strong frontend performance tracking: page load, route changes, JS errors, long tasks, resource timings
- Good for SPA-heavy apps and modern frameworks
- Easy to correlate frontend issues with backend traces, logs, and infrastructure
- Useful dashboards and alerting
- Good session replay and user journey analysis
Best for: teams that want one observability platform across frontend + backend + infra.
Best for developer-centric teams: Sentry Performance
Why it fits:
- Excellent for frontend error tracking + performance
- Very good integration with JavaScript frameworks
- Easier to adopt and often less noisy than bigger observability suites
- Good trace sampling and issue grouping
Best for: product/dev teams that want to quickly find and fix frontend regressions.
Other strong options
- New Relic Browser — solid RUM and observability if you already use New Relic
- FullStory — great session replay and UX insights, but less focused on pure performance observability
- Dynatrace Real User Monitoring — powerful enterprise-grade option, especially for large orgs
- Elastic RUM — good if you already use the Elastic stack
What to look for in your case
For a JavaScript-heavy app, prioritize:
- SPA route change tracking
- Core Web Vitals support
- JS error + performance correlation
- Session replay
- Ability to sample and filter noisy data
- Integration with tracing/APM
Quick recommendation
If you want my default pick: Datadog RUM.
If you want a lighter, more code-focused setup: Sentry Performance.
If you want, I can also recommend the best option based on your stack (React/Vue/Angular, cloud provider, budget, and whether you need session replay).
Observation history
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Meta AI,
Qwen.
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