Comparison
langfuse vs trulens
Verdict
Pick langfuse if langfuse is an open-source platform for evaluating and monitoring large language model applications, offering self-hosting options for local, VM, and Kubernetes environments; pick trulens if trulens aids in evaluating and monitoring Language Model experiments and AI agents, with integrations for various providers.
Markdown twin · langfuse alternatives · trulens alternatives
GraphCanon updated Sep 20, 2026
22views this month
Trust & integrity
| Signal | langfuse | trulens |
|---|---|---|
| Maintenance | Very active (0d since push) As of Sep 18, 2026 · github_public_v1 | Very active (1d since push) As of Sep 20, 2026 · github_public_v1 |
| Provenance | Not a fork · Organization account As of Sep 18, 2026 · github_public_v1 | Not a fork · Organization account As of Sep 20, 2026 · github_public_v1 |
| OSV dependency advisories | No lockfile (source not queried) As of Sep 18, 2026 · osv@v1 | No published findings from this source as of 2026-07-11 As of Jul 11, 2026 · osv@v1 |
| deps.dev advisories | Not queried deps.dev@v1 | Not queried deps.dev@v1 |
| OpenSSF Scorecard | Not queried openssf-scorecard@v1 | Not queried openssf-scorecard@v1 |
Tagline
- langfuse
- Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.
- trulens
- Evaluation and Tracking for LLM Experiments and AI Agents
Stars
- langfuse
- 35k
- trulens
- 3.6k
Forks
- langfuse
- 3.8k
- trulens
- 345
Open issues
- langfuse
- 906
- trulens
- 71
Language
- langfuse
- TypeScript
- trulens
- Python
Adopt for
- langfuse
- Langfuse is an open-source platform for evaluating and monitoring large language model applications, offering self-hosting options for local, VM, and Kubernetes environments.
- trulens
- Trulens aids in evaluating and monitoring Language Model experiments and AI agents, with integrations for various providers.
Persona
- langfuse
- -
- trulens
- -
Runtime
- langfuse
- -
- trulens
- -
License
- langfuse
- Other
- trulens
- MIT
Last pushed
- langfuse
- Sep 18, 2026
- trulens
- Sep 18, 2026
Categories
- langfuse
- Evaluation & Observability
- trulens
- AI Agents, Evaluation & Observability
Trust and health
Days since push
- langfuse
- 0d
- trulens
- 1d
Open issues (now)
- langfuse
- 906
- trulens
- 71
Stars delta
- langfuse
- +2.5k (30d)
- trulens
- +47 (30d)
Open issues delta
- langfuse
- +197 (30d)
- trulens
- +6 (30d)
OSV dependency advisories
- langfuse
- No lockfile (source not queried)
- trulens
- No published findings from this source as of 2026-07-11
Full report
- langfuse
- Trust report
- trulens
- Trust report
Typed relationship
langfuse alternative trulensLangFuse and TruLens both focus on LLM evals, observability, metrics, and offer tools to evaluate and improve applications systematically.
Choose langfuse if…
- langfuse is primarily TypeScript; trulens is Python.
- License: langfuse is Other, trulens is MIT.
- LangFuse and TruLens both focus on LLM evals, observability, metrics, and offer tools to evaluate and improve applications systematically.
- Tags unique to langfuse: analytics, evaluation, llm-observability, monitoring.
- langfuse ships Docker support for self-hosted deployment.
- When you need a self-hosted solution for evaluating and monitoring large language model applications, as Langfuse supports local, VM, and Kubernetes environments.
When NOT to use langfuse
- If you are looking for a fully managed service without the need for self-hosting, as Langfuse requires setting up and maintaining the infrastructure yourself.
- When you need enterprise features that are not covered by the open-source version, as the `ee` folders are not open-source and may require additional licensing or services.
Choose trulens if…
- trulens is primarily Python; langfuse is TypeScript.
- License: trulens is MIT, langfuse is Other.
- LangFuse and TruLens both focus on LLM evals, observability, metrics, and offer tools to evaluate and improve applications systematically.
- Tags unique to trulens: agent-evaluation, ai-agents, ai-monitoring, evaluation-tool.
- Also covers AI Agents.
- Need to evaluate specific models from OpenAI, Google Gemini, AWS Bedrock, or HuggingFace.
When NOT to use trulens
- Looking for a tool that solely focuses on training models rather than evaluation and monitoring.
- Require support for less common model providers not listed in Trulens integrations.
Explore
Sources
Every stat on this page traces to a dated GitHub sync, license file, enrichment field, or trust scan.
- GitHub stars (langfuse/langfuse) · observed Sep 20, 2026
- GitHub forks (langfuse/langfuse) · observed Sep 20, 2026
- Last push (langfuse/langfuse) · observed Sep 18, 2026
- License file (Other) · observed Sep 20, 2026
- Decision facts (enrichment) · observed Sep 18, 2026
- Trust scan (lockfile / OSV) · observed Sep 18, 2026
- GitHub stars (truera/trulens) · observed Sep 20, 2026
- GitHub forks (truera/trulens) · observed Sep 20, 2026
- Last push (truera/trulens) · observed Sep 18, 2026
- License file (MIT) · observed Sep 20, 2026
- Decision facts (enrichment) · observed Jul 12, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
GitHub stars on cards: langfuse 35k · trulens 3.6k (synced Sep 20, 2026).
Common questions
- What is the difference between langfuse and trulens?
- langfuse: Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.. trulens: Evaluation and Tracking for LLM Experiments and AI Agents. See the comparison table for live GitHub stats and shared categories.
- When should I choose langfuse over trulens?
- Choose langfuse over trulens when langfuse is primarily TypeScript; trulens is Python; License: langfuse is Other, trulens is MIT; LangFuse and TruLens both focus on LLM evals, observability, metrics, and offer tools to evaluate and improve applications systematically; Tags unique to langfuse: analytics, evaluation, llm-observability, monitoring; langfuse ships Docker support for self-hosted deployment; When you need a self-hosted solution for evaluating and monitoring large language model applications, as Langfuse supports local, VM, and Kubernetes environments.
- When should I choose trulens over langfuse?
- Choose trulens over langfuse when trulens is primarily Python; langfuse is TypeScript; License: trulens is MIT, langfuse is Other; LangFuse and TruLens both focus on LLM evals, observability, metrics, and offer tools to evaluate and improve applications systematically; Tags unique to trulens: agent-evaluation, ai-agents, ai-monitoring, evaluation-tool; Also covers AI Agents; Need to evaluate specific models from OpenAI, Google Gemini, AWS Bedrock, or HuggingFace.
- When should I avoid langfuse?
- If you are looking for a fully managed service without the need for self-hosting, as Langfuse requires setting up and maintaining the infrastructure yourself. When you need enterprise features that are not covered by the open-source version, as the
eefolders are not open-source and may require additional licensing or services. - When should I avoid trulens?
- Looking for a tool that solely focuses on training models rather than evaluation and monitoring. Require support for less common model providers not listed in Trulens integrations.
- Is langfuse or trulens more popular on GitHub?
- langfuse has more GitHub stars (34,763 vs 3,563). Stars measure visibility, not whether either tool fits your constraints.
- Are langfuse and trulens open source?
- Yes - both are open-source projects on GitHub (langfuse: Other, trulens: MIT).
- Where can I find alternatives to langfuse or trulens?
- GraphCanon lists graph-backed alternatives at langfuse alternatives and trulens alternatives (langfuse markdown twin, trulens markdown twin), ranked by typed relationship edges rather than popularity votes.
- Is there a machine-readable version of this comparison?
- Yes. The markdown twin at this comparison mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers.
- Which is better maintained, langfuse or trulens?
- langfuse: Very active. trulens: Very active. 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 langfuse and trulens?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: langfuse trust report; trulens trust report.