Sentry

Sentry is an error tracking and performance monitoring platform founded in 2008 by David Cramer and Chris Jennings, headquartered in San Francisco, providing real-time crash reports, stack traces, performance metrics, session replays, and release tracking for web, mobile, desktop, and backend applications across over thirty programming languages and frameworks, used by over seventy thousand organizations including Microsoft, Cisco, Cloudflare, Reddit, and Disney to identify, triage, and resolve production issues before they impact users. The error tracking captures unhandled exceptions, promise rejections, and manually reported errors with complete stack traces, request context including headers and body data, breadcrumbs showing user actions and system events leading to the error, environment and release metadata, device and browser information, and user identity for affected users, enabling developers to reproduce and fix issues with full context rather than vague user reports. The performance monitoring traces distributed transactions across frontend, backend, database, and external service calls, generating waterfall views that reveal latency bottlenecks, database query performance, and external API response times, with span-level detail for each operation and automatic anomaly detection for slow endpoints. The session replay feature records DOM mutations, user interactions, network requests, and console output, enabling visual reproduction of issues as experienced by real users. The release tracking correlates errors and performance regressions with specific deployments, automatically notifying teams of new issues introduced by releases. The alerting system routes notifications to Slack, PagerDuty, email, and webhooks based on issue severity and ownership. The source map support enables readable stack traces in production. Designed for software engineers, SRE teams, and development organizations.