Categories / Monitoring & LLM observability
Monitoring & LLM observability
Know when it breaks and what it costs.
Picks changed this week: none. These picks were first published on 2026-10-15.
Why it wins: Error and performance monitoring; the standard.
Pick something else if you also want product analytics (PostHog) or you're tracing LLM calls and costs (Langfuse, Helicone).
Visit Sentry →Last verified 2026-10-16Alternatives
PostHog
Product analytics, session replay and flags in one place.
Free tier on every product · usage-basedLast verified 2026-10-16
Langfuse
Tracing, evals and cost tracking for LLM apps.
Hobby free · Core $29/moLast verified 2026-10-16
Helicone
LLM proxy that adds logging and cost tracking.
Hobby free · Pro $79/moLast verified 2026-10-16Compare at a glance
| Tool | Pricing | Open source | Platform | Best for (our take) | Last verified |
|---|---|---|---|---|---|
 Sentry top | Free (1 user) · Team $26/mo (annual) | Source-available (FSL-1.1) | Hosted, Self-hosted | Errors + performance | 2026-10-16 |
| PostHog | Free tier on every product · usage-based | Yes (MIT core; ee/ excluded) | Hosted | Analytics + replay + flags | 2026-10-16 |
| Langfuse | Hobby free · Core $29/mo | Yes (MIT core; ee/ excluded) | Hosted, Self-hosted | LLM tracing + evals | 2026-10-16 |
| Helicone | Hobby free · Pro $79/mo | Yes (Apache-2.0) | Hosted | LLM logging via proxy | 2026-10-16 |
Every pricing, open-source and platform fact was checked by hand on the tool's own pricing page, docs or official GitHub repo (license file). Click a fact to open its source. Open source means an OSI-approved license in the official repo; source-available licenses such as FSL are labeled as such. Anything we couldn't confirm is marked unverified, not guessed.
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