Categories
APM & full-stack
Application performance, traces, metrics and all-in-one platforms.
Best free: New Relic
Logs
Log ingestion, search and retention.
Best free: Axiom
Error tracking
Exception capture, grouping and alerting.
Best free: Sentry
Uptime, cron & status pages
External checks, heartbeat/cron monitors and public status pages.
Best free: UptimeRobot
On-call & incidents
Paging, escalation and incident response.
Best free: PagerDuty
LLM observability
Tracing, evals and cost tracking for LLM apps.
Best free: Langfuse
Product analytics & replay
Session replay and product analytics with error capture.
Best free: PostHog