Best LLM and agent tracing / observability tool
Depot Pick: Langfuse. Runner-up: Helicone (then LangSmith). Job: LLM/agent tracing. Updated 2026-10-28 (newest stored date on this page).
See prompts, tool calls, latency, and failures in production.
Ready call for agents
MCP https://getagentdepot.com/api/mcp → decide {"task":"trace my LLM agent calls"}
HTTP GET /api/decide?jtbd=llm-tracingNo key. The reply carries the pick, runner-up, the pick's sourced price with its date, and a recheck token.
Depot Pick: Langfuse
Editorial score 8.66 / 10 (curated estimate, as of 2026-10-28). Prices below are copied from the provider's own page; units are never converted.
dx + pricePerf + privacy (self-host option).
| Item | Price (USD) | Source | Price as of | Last re-checked |
|---|---|---|---|---|
| Hobby plan | $0 / month (plan base fee) | official page | 2026-10-21 | not reconfirmed |
| Core plan | $29 / month (plan base fee) | official page | 2026-10-21 | not reconfirmed |
| Pro plan | $199 / month (plan base fee) | official page | 2026-10-21 | not reconfirmed |
| Pro + Teams add-on plan | $499 / month (plan base fee) | official page | 2026-10-21 | not reconfirmed |
Runner-up 1: Helicone
Editorial score 8.13 / 10 (curated estimate, as of 2026-10-28). Prices below are copied from the provider's own page; units are never converted.
| Item | Price (USD) | Source | Price as of | Last re-checked |
|---|---|---|---|---|
| Hobby plan | $0 / month (plan base fee) | official page | 2026-10-22 | not reconfirmed |
| Pro plan | $79 / month (plan base fee) | official page | 2026-10-22 | not reconfirmed |
| Team plan | $799 / month (plan base fee) | official page | 2026-10-22 | not reconfirmed |
Runner-up 2: LangSmith
Editorial score 8.09 / 10 (curated estimate, as of 2026-10-28). Prices below are copied from the provider's own page; units are never converted.
| Item | Price (USD) | Source | Price as of | Last re-checked |
|---|---|---|---|---|
| Developer plan | $0 / month (plan base fee) | official page | 2026-10-22 | not reconfirmed |
| Plus plan | $39 / month (plan base fee) | official page | 2026-10-22 | not reconfirmed |
Questions
- What does Agent Depot pick for LLM/agent tracing?
- Langfuse is the stored Depot Pick for the job llm-tracing. dx + pricePerf + privacy (self-host option).
- What is the runner-up?
- Helicone, then LangSmith. The ranking is editorial (scores as of 2026-10-28) and is not chosen by price.
- When should I not use Langfuse?
- Deep LangChain shop — LangSmith. Want proxy in 10 minutes — Helicone. OSS-only — Phoenix. Python/PydanticAI traces + app OTel together — Logfire. Free eval+trace SKU — HoneyHive.
- How much does Langfuse cost?
- Hobby plan: $0 per month (plan base fee), copied from https://langfuse.com/pricing (price as of 2026-10-21). More rows are in the table on this page.
Picks are editorial and dated; community reports never change a pick or a score. Method: /methodology · Corrections: /corrections · Compare: Langfuse vs Helicone