Observability & Errors
Errors, traces, logs, performance — for production apps.
Error tracking
- ★ Sentry — gold standard. Generous free tier (5k errors/month, 10k traces). Works on every framework.
- Highlight — error tracking + session replay + product analytics; open source + hosted free tier.
- Rollbar — older alternative.
- Bugsnag — paid; mature.
- GlitchTip — open-source Sentry-compatible self-host.
Logs
- ★ Better Stack (formerly Logtail) — generous free tier; nice UI.
- Axiom — fast, queryable, free tier.
- Datadog — heavyweight; paid, enterprise.
- New Relic — same.
- Grafana Loki — open-source, self-hostable.
- OpenObserve — open-source, self-hostable, low storage.
Traces / metrics
- ★ OpenTelemetry — vendor-neutral instrumentation; ship spans/metrics to any OTel-compatible backend.
- Honeycomb — best-in-class trace querying; small free tier.
- Tempo + Grafana — self-hosted traces.
- SigNoz — open-source APM.
All-in-one observability (free tiers)
- Better Stack — logs + uptime + status pages, generous free tier.
- Axiom — logs + traces, free tier.
- Highlight — errors + replay + traces.
- Vercel Observability — bundled with Vercel.
- Cloudflare Workers Observability — built-in for Workers.
Uptime / status
- Better Stack Uptime — free tier.
- OpenStatus — open source.
- UptimeRobot — generous free tier.
- Status pages: Cachet, Atlassian Statuspage, OpenStatus.
Pick this if…
- Errors only, just want it to work: Sentry.
- Logs and don't want to overpay: Better Stack or Axiom.
- Self-host everything: SigNoz (APM) + Grafana Loki (logs) + OpenObserve.
- Vendor-neutral instrumentation: OpenTelemetry.