DeepEval vs Ragas
Both are alternatives to Braintrust. Here's how they stack up — verified facts, no spin.
Also searched as Ragas vs DeepEval — same comparison, one verdict.
DeepEval and Ragas are closely matched on ownership (92 vs 92) — this one comes down to pricing and to which trade-offs below you can live with.
DeepEval
Evals as pytest tests, with the research metrics already implemented.
DeepEval brings LLM evaluation into pytest, so an eval is a test function and your existing test runner, CI integration and reporting all work unchanged. It ships implementations of the metrics people actually cite — answer relevancy, faithfulness, contextual precision and recall, hallucination, bias, toxicity — including several LLM-as-judge metrics done carefully. Apache-2.0, from Confident AI, who sell an optional hosted platform.
Ragas
Purpose-built RAG evaluation — measures retrieval and generation separately.
Ragas evaluates RAG systems specifically, and its central insight is that retrieval failure and generation failure need separate measurement. Context precision and recall tell you whether the retriever found the right material; faithfulness and answer relevancy tell you whether the model used it honestly. Without that separation you know the answer was wrong but not which half to fix. Apache-2.0, and it composes with LlamaIndex and Haystack directly.
Side by side
6 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| DeepEval | Ragas | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 92 | 92 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first data | Yes | Yes |
| License | Apache-2.0 | Apache-2.0 |
| Pricing | Free and Apache-2.0; optional paid cloud dashboard. | Free, Apache-2.0. |
It's close — DeepEval and Ragas score evenly. Choose on the trade-offs below.
Weighing both against staying on Braintrust? Is Braintrust free? What it actually costs →
DeepEval
Strengths
- +Pytest-native — your existing CI and reporting just work
- +Large library of implemented, research-backed metrics
- +Synthetic test-case generation for cold-start coverage
- +Apache-2.0 with no seat cost
Trade-offs
- −LLM-as-judge metrics cost tokens on every run
- −Assumes a Python codebase
- −Best dashboard experience is the paid hosted one
Ragas
Strengths
- +Separates retrieval quality from generation quality
- +Can generate a synthetic test set from your own documents
- +Integrates directly with LlamaIndex and Haystack
- +Apache-2.0
Trade-offs
- −RAG-specific — not a general evaluation framework
- −Judge-model calls make large suites cost real money
- −Metric scores need calibration before you trust them
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose DeepEval
if pytest-native — your existing CI and reporting just work.
Choose Ragas
if separates retrieval quality from generation quality.
Neither, yet
if both carry a real cost you should weigh first — lLM-as-judge metrics cost tokens on every run, and rAG-specific — not a general evaluation framework. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
DeepEval vs Ragas — common questions
Is DeepEval a better fit than Ragas for llm evaluation & testing?
It depends on what you are optimising for, and the honest split is this: DeepEval scores 92 to Ragas's 92 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. Ragas earns its place on a different axis — separates retrieval quality from generation quality. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
DeepEval keeps its data local or in open formats, so leaving is an export rather than a negotiation. Ragas is still self-hostable, so the files stay on your server either way — but it is not local-first by design, so check what its export produces before you rely on it.
Can I self-host DeepEval or Ragas?
Both can be self-hosted. The difference is what it costs you in time rather than whether it is possible — see the setup and maintenance rows above.
Are DeepEval and Ragas both alternatives to Braintrust?
Yes — both appear in our Braintrust comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off Braintrust and now choosing between the two replacements, which is a narrower and much easier question.
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Facts verified 2026-08-11. Licenses and pricing change — spotted something out of date? That's a correction we want.