Opik
Comet's open-source platform for LLM and agent tracing, evaluation, prompt management and monitoring.
Sources and review
Checked against public documentation on . Suitability guidance is our editorial judgment; this is not a performance benchmark or an endorsement.
Teams that want a fully self-hostable alternative to commercial LLM observability tools.
About Opik
Opik, built by Comet, covers the LLM application lifecycle from the first trace in development to production monitoring: agent tracing and observability, LLM-as-a-judge and other evaluations, prompt management and production dashboards. It is Apache-2.0 licensed and free to self-host in full, with a hosted option on Comet.com and an MCP integration for coding agents.
Opik is listed in this index written primarily in Python, with 23k stars on GitHub. Its latest recorded repository push was in November 2026; that is not an ASE editorial review date.
pip install opikOpik and related category tools
Alternatives guide →| Record | Stars | Pricing | ||
|---|---|---|---|---|
| Opikthis listing | 23k | Python | Apache-2.0 | Costs not checked |
| Langfuse | 37k | TypeScript | MIT | Costs not checked |
| LangSmith | — | — | — | Developer tracing allowance; paid seats, usage and separate service entitlements |
| Arize Phoenix | 12k | Python | Elastic-2.0 | Self-host software; infrastructure and evaluator/model costs |
| Promptfoo | 27k | — | MIT | Community software; model/target costs; paid enterprise options |
| Browserbase | — | — | — | Freemium |
