comparison
PromptEval vs Promptfoo
Both evaluate prompts — but answer different questions. Promptfoo asks "does my prompt pass my tests?" PromptEval asks "is my prompt technically well-written?" — no configuration required.
Quick answer
Use Promptfoo when you have a dataset and need regression testing or CI/CD integration. Use PromptEval when you need instant structural diagnosis without setup — paste and score in seconds.
Feature comparison
Frequently asked questions
What is the fundamental difference between PromptEval and Promptfoo?
Promptfoo asks "does my prompt pass my tests?" — you need to write test cases and evaluation criteria. PromptEval asks "is my prompt technically well written?" — provides an objective score with no configuration or test cases required.
Do I need to install anything to use PromptEval?
No. PromptEval is a web application — paste your prompt and get a score immediately. Promptfoo requires Node.js, npm installation, and a YAML configuration file.
When should I use Promptfoo instead of PromptEval?
Use Promptfoo when you already have a regression test suite for LLMs, need batch A/B comparison with hundreds of inputs, or want to integrate prompt evaluation into CI/CD. For quick diagnosis without configuration, use PromptEval.
Is Promptfoo open source? Is PromptEval?
Promptfoo is open source. PromptEval is a SaaS with a free plan (3 evaluations/month) and paid plans. PromptEval requires no installation or configuration.
How do I evaluate prompt quality without writing test cases?
PromptEval was built exactly for this. Paste your prompt and get a 0-100 score with breakdown across clarity, specificity, structure, and robustness, plus critical issues and surgical recommendations — no test cases needed.