Comparison
phoenix vs langtrace
phoenix (AI Observability & Evaluation) vs langtrace (Open Source Observability for LLM Applications) - live GitHub stats and typed graph relationships, not marketing.
Markdown twin · phoenix alternatives · langtrace alternatives
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Tagline
- phoenix
- AI Observability & Evaluation
- langtrace
- Open Source Observability for LLM Applications
Stars
- phoenix
- 10k
- langtrace
- 1.2k
Forks
- phoenix
- 962
- langtrace
- 124
Open issues
- phoenix
- 650
- langtrace
- 1
Language
- phoenix
- Python
- langtrace
- TypeScript
Adopt for
- phoenix
- -
- langtrace
- Langtrace is an open-source observability software that provides real-time monitoring and performance insights for applications leveraging LLM APIs, vector databases, and LLM-based frameworks through Open Telemetry. It's
Persona
- phoenix
- -
- langtrace
- -
Runtime
- phoenix
- -
- langtrace
- -
License
- phoenix
- Other
- langtrace
- AGPL-3.0 implies that any changes made to the software must be released under the same license, which might limit its use in commercial products closed off to users.
Last pushed
- phoenix
- Jul 8, 2026
- langtrace
- Nov 17, 2025
Categories
- phoenix
- Evaluation & Observability
- langtrace
- Evaluation & Observability
Trust and health
Maintenance
- phoenix
- Very active (96%)
- langtrace
- Slowing (36%)
Days since push
- phoenix
- 0d
- langtrace
- 232d
Open issues (now)
- phoenix
- 650
- langtrace
- 1
Full report
- phoenix
- Trust report
- langtrace
- Trust report
Typed relationship
phoenix langtrace
Choose phoenix if…
- phoenix is primarily Python; langtrace is TypeScript.
- License: phoenix is Other, langtrace is AGPL-3.0.
- Graph edge: phoenix is a typed related of langtrace - see the relationship row above.
- Tags unique to phoenix: smolagents, agents, ai-monitoring, evals.
When NOT to use phoenix
- Evaluation & Observability: Defer heavyweight eval infra only until you have real traffic - never skip it once users depend on answers.
Choose langtrace if…
- langtrace is primarily TypeScript; phoenix is Python.
- License: langtrace is AGPL-3.0, phoenix is Other.
- Requirements: Self-hosting is available as an option if desired..
- Graph edge: langtrace is a typed related of phoenix - see the relationship row above.
- Tags unique to langtrace: evaluations, llm, ai, observability.
- - When you are developing or managing applications that heavily rely on LLM APIs and want to capture, debug, and analyze traces and metrics in real-time using Open Telemetry.
When NOT to use langtrace
- - If you need proprietary features absent from the AGPL-3.0 open-source license, as Langtrace's nature may limit its use in closed or commercial projects.
- - For organizations with existing observability solutions deeply integrated into their infrastructure that do not benefit significantly from adding an additional layer of monitoring.
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Related comparisons
Common questions
- What is the difference between phoenix and langtrace?
- phoenix: AI Observability & Evaluation. langtrace: Open Source Observability for LLM Applications. See the comparison table for live GitHub stats and shared categories.
- When should I choose phoenix over langtrace?
- Choose phoenix over langtrace when phoenix is primarily Python; langtrace is TypeScript; License: phoenix is Other, langtrace is AGPL-3.0; Graph edge: phoenix is a typed related of langtrace - see the relationship row above; Tags unique to phoenix: smolagents, agents, ai-monitoring, evals.
- When should I choose langtrace over phoenix?
- Choose langtrace over phoenix when langtrace is primarily TypeScript; phoenix is Python; License: langtrace is AGPL-3.0, phoenix is Other; Requirements: Self-hosting is available as an option if desired.; Graph edge: langtrace is a typed related of phoenix - see the relationship row above; Tags unique to langtrace: evaluations, llm, ai, observability; - When you are developing or managing applications that heavily rely on LLM APIs and want to capture, debug, and analyze traces and metrics in real-time using Open Telemetry.
- When should I avoid phoenix?
- Evaluation & Observability: Defer heavyweight eval infra only until you have real traffic - never skip it once users depend on answers.
- When should I avoid langtrace?
- - If you need proprietary features absent from the AGPL-3.0 open-source license, as Langtrace's nature may limit its use in closed or commercial projects. - For organizations with existing observability solutions deeply integrated into their infrastructure that do not benefit significantly from adding an additional layer of monitoring.
- Is phoenix or langtrace more popular on GitHub?
- phoenix has more GitHub stars (10,453 vs 1,213). Stars measure visibility, not whether either tool fits your constraints.
- Are phoenix and langtrace open source?
- Yes - both are open-source projects on GitHub (phoenix: Other, langtrace: AGPL-3.0).
- Where can I find alternatives to phoenix or langtrace?
- GraphCanon lists graph-backed alternatives at /tools/arize-ai-phoenix/alternatives and /tools/scale3-labs-langtrace/alternatives (/tools/arize-ai-phoenix/alternatives.md, /tools/scale3-labs-langtrace/alternatives.md), ranked by typed relationship edges rather than popularity votes.
- Is there a machine-readable version of this comparison?
- Yes. The markdown twin at /compare/arize-ai-phoenix-vs-scale3-labs-langtrace.md mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers.
- Which is better maintained, phoenix or langtrace?
- phoenix: Very active. langtrace: Slowing. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance.
- Where are the full trust reports for phoenix and langtrace?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: phoenix: /tools/arize-ai-phoenix/trust; langtrace: /tools/scale3-labs-langtrace/trust.