Sentry
Monitoring · Free · since 2012 · open source
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Sentry is the leading error tracking platform, used by millions of developers to catch and fix application errors in real time. It provides detailed stack traces, breadcrumbs, session replay, and performance monitoring across web, mobile, and backend applications.
The free Developer plan covers 5K errors and 10K performance events per month. The Team plan starts at $26/month with 50K errors included, scaling with usage. Sentry is also open source and can be self-hosted.
pros
- Best-in-class error tracking with detailed stack traces
- Session replay shows exactly what users experienced
- Open source with self-hosting option
- Supports virtually every language and framework
cons
- Event-based pricing can get expensive with noisy apps
- Performance monitoring is less mature than dedicated APM tools
- Alert fatigue if not configured carefully
- Self-hosted version requires significant infrastructure
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