Observability / APM
Sentry
Functional Software, Inc.
Error monitoring that grew into developer-first APM — connects errors → traces → spans → profiles → replays in one workflow, aimed at app developers.
- Category
- Observability / APM
- License
- Open core
- Deployment
- SaaS or self-hosted
- Cost
- Low
- Free tier
- Yes
- Self-host effort
- Moderate
- Maturity
- Incumbent
- Popularity
- ≈40k+ GitHub stars; dominant in error tracking
The catch
It's APM from the app-developer angle, not infrastructure observability (no host/network/K8s monitoring), and span-based metering means high-traffic apps rack up span costs.
Monitors
TracesLogsRUMProfiling
Capabilities
AlertingDistributed tracingAPI
Built for
Developers
First-hand data
data as of Jun 24, 2026
- Significant incidents · 90d
- 11 minor
- Incident-minutes logged
- 2 hcumulative, not downtime
- Last incident
- Jun 24, 2026
Polled first-hand from each vendor's public status page & GitHub. "Significant" excludes informational notices & planned maintenance; incident-minutes sum per-incident durations (not platform downtime). Method & full data →