Sentry is a developer-first error tracking and application performance monitoring platform that captures, groups, and diagnoses software errors and performance issues across an application's frontend, backend, and infrastructure.
Sentry's core is error monitoring: it captures exceptions in real time, groups similar events into issues, and attaches the stack trace, breadcrumbs, and offending release so developers can reproduce and resolve a failure quickly. Performance monitoring extends this through distributed tracing that follows a request across services to surface slow database queries and API bottlenecks, while session replay reconstructs the user interactions leading up to an error and structured logs sit alongside traces for context.
Beyond the core, the platform offers AI-powered debugging through Seer, which analyzes an error to propose a root cause, plus profiling for code-level visibility, customizable dashboards and alerts, and AI observability for LLM applications, AI agents, and Model Context Protocol servers. It integrates with developer workflows including GitHub, Jira, GitLab, and Azure DevOps. Originally released as open source, Sentry's core remains available for self-hosting alongside the managed sentry.io service.
Sentry reports use by more than 100,000 organizations processing billions of error events daily. Its plans run from a free Developer tier to paid tiers that add longer data retention, additional integrations, and the ability to scale event volume, with a 14-day trial of paid features.