helicone vs promptfoo

Common questions

What is the difference between helicone and promptfoo?

helicone: Open source LLM observability 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 helicone over promptfoo?

Choose helicone over promptfoo when License: helicone is Apache-2.0, promptfoo is MIT; Helicone and promptfoo both serve to evaluate Large Language Models (LLMs), with Helicone focusing on monitoring, experimentation, and routing across multiple models via an API, while promptfoo emphasizes CLI tools and libraries for comprehensive testing and red-teaming of LLM applications; Tags unique to helicone: agent-monitoring, analytics, gpt, langchain; When you need to monitor and evaluate the performance of large language models in real-time.

When should I choose promptfoo over helicone?

Choose promptfoo over helicone when License: promptfoo is MIT, helicone is Apache-2.0; 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.; Helicone and promptfoo both serve to evaluate Large Language Models (LLMs), with Helicone focusing on monitoring, experimentation, and routing across multiple models via an API, while promptfoo emphasizes CLI tools and libraries for comprehensive testing and red-teaming of LLM applications; 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 helicone?

If your project requires proprietary or closed-source tools, as Helicone is open-source and can be self-hosted. When you need a platform that does not require setting up an API key and modifying your codebase to integrate monitoring. If you are looking for a solution that does not support a wide range of models through a single API, and you prefer platform-specific tools. For users who do not want to manage their own infrastructure, as Helicone offers self-hosting options which require local setup and maintenance.

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 helicone or promptfoo more popular on GitHub?

promptfoo has more GitHub stars (25,251 vs 6,162). Stars measure visibility, not whether either tool fits your constraints.

Are helicone and promptfoo open source?

Yes - both are open-source projects on GitHub (helicone: Apache-2.0, promptfoo: MIT).

Where can I find alternatives to helicone or promptfoo?

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

helicone: 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 helicone and promptfoo?

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