The strongest open-source alternatives to Ragas for building AI agents — evals & testing ranked by GitHub traction, each with a head-to-head.
Ragas (★ 15k) is Evaluation toolkit for RAG pipelines — faithfulness, answer relevancy, and context metrics without ground truth. If it is not the right fit, these 2 evals & testing cover the same ground — promptfoo is the most-starred option below. Or browse the best evals & testing and Ragas's own page.
Test-driven prompt and agent development — evals, red-teaming, and side-by-side model comparison from the CLI. Best for prompt evals.
Pytest-like framework for unit-testing LLM outputs with metrics for hallucination, relevancy, and bias. Best for LLM unit tests.
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