Sentry

Sentry catches your production errors with full stack traces, breadcrumbs, and user context, then groups them so you're looking at actual issues instead of a wall of duplicates. It covers the whole debugging loop: errors, traces, logs, session replay, and profiling, all connected by the same trace ID.

Structured logs are searchable and linked to traces, so you click from a log entry straight to the full request waterfall. Profiling shows you which functions are slow in production. Session replay works on web, Android, iOS, and React Native. Seer (their AI debugger) uses your errors, traces, logs, and commit history to root-cause issues automatically. Self-hostable and open-source core. SDKs for everything.