Inspect AI vs Ragas
Both are alternatives to Braintrust. Here's how they stack up — verified facts, no spin.
Also searched as Ragas vs Inspect AI — same comparison, one verdict.
Inspect AI and Ragas are closely matched on ownership (93 vs 92) — this one comes down to pricing and to which trade-offs below you can live with.
Inspect AI
The rigorous one, from the UK AI Safety Institute.
Inspect is the evaluation framework built by the UK AI Safety Institute for evaluating frontier models, released MIT. It is the most methodologically serious option here: first-class support for multi-turn agent evaluations, tool use, sandboxed execution and human grading, with a design that takes statistical validity seriously rather than producing a number that feels reassuring. If your evaluations need to withstand scrutiny — regulatory, academic or internal — this is the one.
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.
| Inspect AI | Ragas | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 93 | 92 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first data | Yes | Yes |
| License | MIT | Apache-2.0 |
| Pricing | Free, MIT, publicly funded. | Free, Apache-2.0. |
Inspect AI edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Weighing both against staying on Braintrust? Is Braintrust free? What it actually costs →
Inspect AI
Strengths
- +Built for evaluations that have to survive real scrutiny
- +Strong agent, tool-use and sandboxed-execution support
- +Excellent log viewer for inspecting individual samples
- +MIT, from a public institute with no commercial upsell
Trade-offs
- −Aimed at model evaluation more than application regression testing
- −Steeper learning curve than Promptfoo for simple cases
- −Less oriented toward CI gating out of the box
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 Inspect AI
if a lower exit cost matters more to you than any single feature, and built for evaluations that have to survive real scrutiny.
Choose Ragas
if separates retrieval quality from generation quality.
Neither, yet
if both carry a real cost you should weigh first — aimed at model evaluation more than application regression testing, 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.
Inspect AI vs Ragas — common questions
Is Inspect AI a better fit than Ragas for llm evaluation & testing?
It depends on what you are optimising for, and the honest split is this: Inspect AI scores 93 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?
Inspect AI 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 Inspect AI 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 Inspect AI 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.