Ragas vs 
Promptfoo
Ragas vs Promptfoo compared for 2026 — features, license, ease of use, performance and which one to choose. Measure whether your RAG is any good vs Unit tests for your prompts.
Updated regularly · curated by OpenSourceAI.tech
Ragas vs Promptfoo at a glance
| Spec | Ragas | Promptfoo |
|---|---|---|
| Category | LLM / RAG framework | LLM / RAG framework |
| Type | RAG evaluation | Prompt testing |
| License | Apache-2.0 | MIT |
| Runs locally | Yes | Yes |
| Primary language | Python | TypeScript |
| Ease of use | Intermediate | Beginner |
| Best for | anyone tuning a RAG pipeline blind | teams shipping prompts to production |
| GitHub stars | — | 23.3k |
How Ragas and Promptfoo score
| Criterion | Ragas | Promptfoo |
|---|---|---|
| Popularity | n/a | 3.5 |
| Maintenance | n/a | 5.0 |
| Ease of use | 3.5 | 5.0 |
| Privacy | 5.0 | 5.0 |
| License freedom | 5.0 | 5.0 |
Scores are computed automatically from public signals — GitHub stars (popularity), recent commit activity (maintenance), license type (freedom), local-first design (privacy) and onboarding complexity (ease of use). Indicative, not a verdict.
What each one is
Ragas
Ragas scores RAG pipelines on faithfulness, answer relevance and context precision, turning "it feels better" into numbers.
- Objective RAG quality metrics
- Catches hallucinations quantitatively
- Integrates with LangChain and LlamaIndex
Promptfoo
Promptfoo runs your prompts against test cases across models, catching regressions before they reach production, and includes red-teaming checks.
- Regression tests for prompts
- Compares models side by side
- Built-in security red-teaming
Key differences
Ragas is rAG evaluation, while Promptfoo is prompt testing. Their licenses differ (Apache-2.0 vs MIT), which matters if you ship a commercial product. Ragas leans more intermediate-friendly, whereas Promptfoo is more suited to beginner users. In short, Ragas fits anyone tuning a RAG pipeline blind, and Promptfoo fits teams shipping prompts to production.
Which should you choose?
Choose Ragas for anyone tuning a RAG pipeline blind. Choose Promptfoo for teams shipping prompts to production.
There is rarely one winner — many setups use both. The right pick depends on your hardware, your team's skills, and whether you value simplicity or control.
Frequently asked questions
Is Ragas or Promptfoo easier to use?
Promptfoo is generally the easier of the two to get started with, while Ragas rewards more setup with more control.
Are Ragas and Promptfoo free?
Ragas is free and open source (Apache-2.0), and Promptfoo is free and open source (MIT). Neither charges for the core software.
Can I run Ragas and Promptfoo locally?
Ragas: yes · Promptfoo: yes. Both can be used without sending your data to a third-party cloud where their setup allows.
Ragas vs Promptfoo — which should I pick in 2026?
Choose Ragas for anyone tuning a RAG pipeline blind. Choose Promptfoo for teams shipping prompts to production.
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