Sentry Has a Free Error Tracking Platform With Features Most Developers Never Use

Most developers use Sentry for error alerts. But Sentry also does performance monitoring, session replay, profiling, and cron monitoring — all in the free tier. Free Tier 5K errors/month 10K performance transactions/month 500 session replays/month 1 cron monitor Unlimited team members Setup (React) npm install @sentry/react import * as Sentry from " @sentry/react " ; Sentry . init ({ dsn : " https://your-dsn@sentry.io/project " , integrations : [ Sentry . browserTracingIntegration (), Sentry . replayIntegration (), ], tracesSampleRate : 0.1 , // 10% of transactions replaysSessionSampleRate : 0.1 , // 10% of sessions replaysOnErrorSampleRate : 1.0 , // 100% of error sessions }); Beyond Basic Error Tracking 1. Performance Monitoring // Automatic — tracks page loads, API calls, DB queries // Custom spans const transaction = Sentry . startTransaction ({ name : " processOrder " }); const span = transaction . startChild ({ op : " db.query " , description : " SELECT users " }); await db . que