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Promptfoo vs DeepEval: The Same Support Bot, Tested Both Ways

If you test LLM apps, you will run into Promptfoo and DeepEval within a week. Both are free and open source, both evaluate LLM output, and the comparison posts make them sound interchangeable. They are not. The quickest way to see the difference is to point both at the same app. So I wrote a tiny s…

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  1. 2026-11-12 20:04 · DEV Community — AI
    Promptfoo vs DeepEval: The Same Support Bot, Tested Both Ways

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