Comparison
langfuse vs promptfoo
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 promptfoo if promptfoo is a TypeScript-based tool for evaluating and testing prompts, AI agents, and retrieval-augmented generation systems. It supports red teaming and vulnerability scanning for AI models, with CI/CD integration.
Markdown twin · langfuse alternatives · promptfoo alternatives
GraphCanon updated Sep 20, 2026
12views this month
vs
Trust & integrity
| Signal | langfuse | promptfoo |
|---|---|---|
| Maintenance | Very active (0d since push) As of Sep 18, 2026 · github_public_v1 | Very active (0d since push) As of Sep 18, 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 18, 2026 · github_public_v1 |
| OSV dependency advisories | No lockfile (source not queried) As of Sep 18, 2026 · osv@v1 | No lockfile (source not queried) As of Sep 18, 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.
- promptfoo
- Test prompts, agents, and RAGs. Compare performance of various LLMs.
Stars
- langfuse
- 35k
- promptfoo
- 25k
Forks
- langfuse
- 3.8k
- promptfoo
- 2.3k
Open issues
- langfuse
- 906
- promptfoo
- 631
Language
- langfuse
- TypeScript
- promptfoo
- TypeScript
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.
- promptfoo
- Promptfoo is a TypeScript-based tool for evaluating and testing prompts, AI agents, and retrieval-augmented generation systems. It supports red teaming and vulnerability scanning for AI models, with CI/CD integration.
Persona
- langfuse
- -
- promptfoo
- -
Runtime
- langfuse
- -
- promptfoo
- -
License
- langfuse
- Other
- promptfoo
- MIT
Last pushed
- langfuse
- Sep 18, 2026
- promptfoo
- Sep 18, 2026
Categories
- langfuse
- Evaluation & Observability
- promptfoo
- Evaluation & Observability
Trust and health
Open issues (now)
- langfuse
- 906
- promptfoo
- 631
Stars delta
- langfuse
- +2.5k (30d)
- promptfoo
- +1.4k (30d)
Open issues delta
- langfuse
- +197 (30d)
- promptfoo
- +150 (30d)
Full report
- langfuse
- Trust report
- promptfoo
- Trust report
Typed relationship
langfuse alternative promptfooBoth Promptfoo and Langfuse offer evaluation and observability for LLMs, but they do so through different methodologies and toolsets.
Choose langfuse if…
- License: langfuse is Other, promptfoo is MIT.
- Both Promptfoo and Langfuse offer evaluation and observability for LLMs, but they do so through different methodologies and toolsets.
- Tags unique to langfuse: analytics, llm-observability, monitoring, open-source.
- 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 promptfoo if…
- License: promptfoo is MIT, langfuse is Other.
- Requirements: Requires Node.js >=22.22.0, with Node.js 24 LTS recommended.; API keys for most LLM providers are required and should be set as environment variables..
- Both Promptfoo and Langfuse offer evaluation and observability for LLMs, but they do so through different methodologies and toolsets.
- Tags unique to promptfoo: ci, ci-cd, cicd, evaluation-framework.
- When you need to compare the performance of various LLMs such as GPT, Claude, Gemini, DeepSeek, and more.
When NOT to use promptfoo
- If you are working with languages other than TypeScript, as Promptfoo is specifically designed for TypeScript environments.
- When you do not need to compare multiple LLMs and only require a simple prompt testing tool without advanced features like red teaming.
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 (promptfoo/promptfoo) · observed Sep 20, 2026
- GitHub forks (promptfoo/promptfoo) · observed Sep 20, 2026
- Last push (promptfoo/promptfoo) · observed Sep 18, 2026
- License file (MIT) · observed Sep 20, 2026
- Decision facts (enrichment) · observed Sep 18, 2026
- Trust scan (lockfile / OSV) · observed Sep 18, 2026
GitHub stars on cards: langfuse 35k · promptfoo 25k (synced Sep 20, 2026).
Common questions
- What is the difference between langfuse and promptfoo?
- langfuse: Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.. promptfoo: Test prompts, agents, and RAGs. Compare performance of various LLMs.. See the comparison table for live GitHub stats and shared categories.
- When should I choose langfuse over promptfoo?
- Choose langfuse over promptfoo when License: langfuse is Other, promptfoo is MIT; Both Promptfoo and Langfuse offer evaluation and observability for LLMs, but they do so through different methodologies and toolsets; Tags unique to langfuse: analytics, llm-observability, monitoring, open-source; 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 promptfoo over langfuse?
- Choose promptfoo over langfuse when License: promptfoo is MIT, langfuse is Other; Requirements: Requires Node.js >=22.22.0, with Node.js 24 LTS recommended.; API keys for most LLM providers are required and should be set as environment variables.; Both Promptfoo and Langfuse offer evaluation and observability for LLMs, but they do so through different methodologies and toolsets; Tags unique to promptfoo: ci, ci-cd, cicd, evaluation-framework; When you need to compare the performance of various LLMs such as GPT, Claude, Gemini, DeepSeek, and more.
- 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 promptfoo?
- If you are working with languages other than TypeScript, as Promptfoo is specifically designed for TypeScript environments. When you do not need to compare multiple LLMs and only require a simple prompt testing tool without advanced features like red teaming.
- Is langfuse or promptfoo more popular on GitHub?
- langfuse has more GitHub stars (34,763 vs 25,251). Stars measure visibility, not whether either tool fits your constraints.
- Are langfuse and promptfoo open source?
- Yes - both are open-source projects on GitHub (langfuse: Other, promptfoo: MIT).
- Where can I find alternatives to langfuse or promptfoo?
- GraphCanon lists graph-backed alternatives at langfuse alternatives and promptfoo alternatives (langfuse markdown twin, promptfoo 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 promptfoo?
- langfuse: Very active. promptfoo: 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 promptfoo?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: langfuse trust report; promptfoo trust report.