The client side is the most complex and least predictable surface you ship, and the experience it delivers is what makes or breaks your revenue goals.
The servers are healthy, the user experience isn't
The servers are healthy, the user experience isn't
The slowdown or broken interaction rarely shows up where your backend looks. Infrastructure dashboards stay green while conversions and revenue erode.
The frontend is your highest-cardinality data
The frontend is your highest-cardinality data
The client side spans thousands of device, OS, network and app-version combinations, resulting in more unique context than any backend.
Practitioner depth or end-to-end visibility, not both
Practitioner depth or end-to-end visibility, not both
A losing choice: Adopt a dedicated frontend tool with depth, but strand data in a silo. Or, consolidate on one platform and accept checkbox-grade RUM.
Solutions
Close the Gap with User-Focused Observability
Cortex® XCOR™ RUM captures every web and mobile user session at full fidelity as native OpenTelemetry. Experience technical depth, end-to-end visibility, and tie performance to business outcomes.
See the experience your servers can't
Cortex XCOR RUM is built around the user so frontend issues surface even when infrastructure dashboards stay green.
Answer the long-tail questions others can't
Frontend problems surface as oddly specific questions. Keep the full context behind every session so you can slice by browser, page, device and OS.
Practitioner depth and end-to-end, together
Frontend teams get the session-level detail to diagnose what users hit, in the same OpenTelemetry-native platform as backend metrics and traces.
Key Capabilities
Web and Mobile RUM
From Core Web Vitals to mobile crashes to the flows that drive revenue, capture the full session-level user context behind the frontend experience.
Retrace any session, event by event
Retrace any session, event by event
Open any web or mobile session and follow it in order: interactions, spans, network calls, logs, errors, crashes and ANRs.
Diagnose every Core Web Vital to its root cause
Diagnose every Core Web Vital to its root cause
Tie every LCP, INP and CLS regression to the session, element, sub-part and attributed Long Animation Frame (LoAF) behind it.
Prioritize exceptions by real user impact
Prioritize exceptions by real user impact
Every exception gets a severity score based on how it failed so the errors that blank a page mid-checkout rise to the top of the list.
Fix mobile crashes, ANRs and network failures
Fix mobile crashes, ANRs and network failures
Capture every crash, ANR, error log and device-side network failure in 100% of mobile sessions, with the taps and spans that led to each.
Track the flows that drive revenue and how they end
Track the flows that drive revenue and how they end
Define the flows that matter across mobile and web. Track completion, abandonment and error rates by version and segment.
Investigate web and mobile telemetry in plain language
Investigate web and mobile telemetry in plain language
The MCP Server drills from the headline metric to the exemplar session, delivering the root cause analysis (RCA) that lowers MTTR.
ANALYST RECOGNITION
A 3X Leader in Observability
2026 Gartner® Magic Quadrant™ for Observability Platforms
XCOR RUM ties frontend performance and reliability to the users and the revenue they generate, so teams focus on what matters most, cover every surface, and resolve issues across the full stack.
Resolve user-facing issues faster
Resolve user-facing issues faster
Every crash arrives with the full user session attached so teams move straight to the root cause.
Protect the revenue your experience drives
Protect the revenue your experience drives
Issues are ranked by how many users they affect and what they cost in conversions and retention.
Cover the full front end, web and mobile
Cover the full front end, web and mobile
Mobile RUM and Web RUM share one model and workflow so every user touchpoint gets the same depth.
Frontend and backend on one platform
Frontend and backend on one platform
Frontend RUM and backend observability live together so frontend and SRE teams share a single view.
Frequently Asked Questions
Cortex XCOR Real User Monitoring spans the full frontend: Web RUM and Mobile RUM. It captures how real users experience and transact, and gives session-level detail to find, diagnose and fix what's wrong. Every capability shares one user-focused, full-fidelity approach across both mobile and web.
Find and fix the frontend issues affecting users before they affect revenue. Cortex XCOR real user monitoring (RUM) captures 100% of sessions so teams see exactly what the user experienced. Trace every slow load, failed request, crash and abandoned flow to the underlying session.
Cortex XCOR RUM supports iOS, Android, React Native, Unity and Flutter for mobile, plus web browsers through a Web SDK. All SDKs are open-source and OpenTelemetry-native, emitting the same span and log model across every platform so mobile and web telemetry share one set of attributes and queries.
The Cortex XCOR RUM MCP Server brings full-fidelity web and mobile telemetry into AI assistants and agents. Ask which releases are regressing or what a user experienced before a crash, and it drills from the headline metric to the exemplar session and surfaces findings worth acting on.
Cortex XCOR in Action
See how Cortex XCOR optimizes observability at enterprise scale. Cut data noise and slash incident resolution times without slowing your engineers down.
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