fact-checker vs promptfoo

Common questions

What is the difference between fact-checker and promptfoo?

fact-checker: Fact-checking LLM outputs with self-ask. promptfoo: Test your prompts, agents, and RAGs. Red teaming/pentesting/vulnerability scanning for AI. Compare performance of GPT, Claude, Gemini, DeepSeek, and more. Simple declarative configs with command line . See the comparison table for live GitHub stats and shared categories.

When should I choose fact-checker over promptfoo?

Choose fact-checker over promptfoo when fact-checker is primarily Jupyter Notebook; promptfoo is TypeScript; Tags unique to fact-checker: python, jupyter notebook; Leaner open-issue backlog (0).

When should I choose promptfoo over fact-checker?

Choose promptfoo over fact-checker when promptfoo is primarily TypeScript; fact-checker is Jupyter Notebook; Pricing: The basic version of Promptfoo is freely available due to its open-source nature under MIT licensing. Advanced features may require a paid plan from future commercial offerings.; Requirements: Requires TypeScript runtime and relevant node.js or deno setup to run.; May need additional configuration for CI/CD integration, depending on the build ecosystem.; Tags unique to promptfoo: ci-cd, evaluation, llm-eval, ci; Also covers AI Agents; promptfoo ships Docker support for self-hosted deployment; When you need to assess the robustness of your RAG systems against potential vulnerabilities.

When should I avoid fact-checker?

Last GitHub push was 992 days ago (dormant maintenance, Oct 23, 2023). Validate activity before betting a new project on fact-checker. Vector Databases: Don't reach for a dedicated vector DB under ~100k vectors; pgvector on your existing Postgres is simpler to operate. LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves.

When should I avoid promptfoo?

When you are specifically looking for general-purpose evaluation tools that do not have the focused depth on security and vulnerability provided by Promptfoo. If your workflow or project cannot support TypeScript, as this tool is built in TypeScript and might require additional setup for non-TypeScript environments.

Is fact-checker or promptfoo more popular on GitHub?

promptfoo has more GitHub stars (23,155 vs 308). Stars measure visibility, not whether either tool fits your constraints.

Are fact-checker and promptfoo open source?

Yes - both are open-source projects on GitHub.

Where can I find alternatives to fact-checker or promptfoo?

GraphCanon lists graph-backed alternatives at fact-checker alternatives and promptfoo alternatives (fact-checker 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, fact-checker or promptfoo?

fact-checker: Dormant. 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 fact-checker and promptfoo?

GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: fact-checker trust report; promptfoo trust report.