Langfuse alternatives: Opik and Phoenix compared

Opik and Phoenix are the two Langfuse alternatives covered here, checked 2026-10-14. Opik's sources state Apache-2.0 licensing, Docker and Kubernetes self-hosting, and an MCP server. Phoenix's sources stress evaluations, prompt tooling and experiments, and its repository license is not reported by the GitHub API.

Quick comparison

Why teams look for alternatives

The cited sources do not give reasons for leaving Langfuse, so treat the following as criteria to check rather than documented complaints.

• License clarity. The Langfuse site says all product features are MIT licensed, while the GitHub API does not report a recognized license for the repository. Confirm which applies to your version before comparing.
• Deployment control. Check whether each tool documents self-hosting and what infrastructure it expects.
• Surface area. Check whether you need prompt optimization, dataset evaluators or IDE-agent access, and whether each option documents them.

For a broader feature comparison, see the LLM observability tools guide and Opik vs Langfuse. The current platform is described on the Langfuse hub.

How the options differ

Opik

Opik describes itself as an open-source platform for understanding, measuring and improving LLM applications. Its repository reports Apache-2.0 as the license.

Its docs describe deployment on your own infrastructure with Docker locally or Kubernetes at scale. They also say all Opik versions (cloud, open source, and enterprise) include the full AI engineering feature set.

On the feature side, the docs list tracing of LLM calls, tool invocations and agent steps, LLM-as-a-judge and heuristic metrics, prompt versioning with a Prompt Playground, and six optimization algorithms. An Opik MCP server connects tools such as Claude Code, Cursor, VS Code Copilot, Codex and opencode to a workspace.

Phoenix

Phoenix's docs list LLM-based evaluations, dataset evaluators, and evaluator integrations including Ragas, Deepeval and Cleanlab. They also list human annotations in the UI.

For prompts, the docs list prompt management, a Prompt Playground, Span Replay, and syncing prompts across environments via SDK. For experiments, they list running experiments and creating datasets from traces or from code/CSV.

The repository description is "AI Observability & Evaluation". The GitHub API reports no recognized license, and the excerpts we read do not state a self-hosting procedure or pricing.

Migration notes

Only the points below are documented in the sources. Everything else needs checking against each tool's own docs.

• Trace instrumentation. Opik's docs say it works with OpenAI, Anthropic, LangChain and 50+ other providers and frameworks. The Langfuse site says it works with any language and framework supporting OTel instrumentation, plus 100+ integrations. Whether Opik or Phoenix ingest Langfuse-style OTel traces is not stated in the cited sources.
• Data export. The Langfuse site says it has REST APIs for everything and will not lock in your data. Export formats and import paths into Opik or Phoenix are not stated in the cited sources.
• Self-hosting. Opik documents Docker and Kubernetes deployment. Langfuse's site lists ClickHouse, a Redis queue and S3/Blob storage in its architecture; matching infrastructure for the alternatives is not stated.
• Datasets and evals. Opik lets you turn traces into test cases via UI or SDK. Phoenix lets you collect traces into datasets or upload from code/CSV. Both are comparable concepts to Langfuse datasets and experiments, though automated conversion is not documented.
• Prompts. Opik stores and versions prompts. Phoenix versions, stores and deploys prompts. Langfuse's prompt-management format compatibility is not stated.

How we compared

We read the GitHub repository metadata and the product documentation pages for Opik, Phoenix and Langfuse, all checked on 2026-10-14. We did not install, run or benchmark any of them, and we did not verify performance, scale, pricing or cloud availability.

Limitations

• No pricing is stated in the cited sources for Opik or Phoenix, so we make no free-tier or cost claims. A permissive repository license does not make hosted use free.
• Phoenix's license is not reported by the GitHub API; check the repository directly.
• Langfuse's license is reported as MIT on its site but not recognized by the GitHub API.
• No migration tooling, API compatibility or feature-parity statements appear in the excerpts.
• Adoption figures on the Langfuse site are vendor claims and are not compared here.

Explore the Agent infra category, the Langfuse, Opik and Phoenix hubs, and the latest launches: Opik 2.2.97 and Phoenix v20.21.0.