Best LLM Evaluation Tools in 2026
Updated
In short: DeepEval is ranked #1 of 29 as of 5 October 2026, ahead of Promptfoo and Giskard. The best-ranked option with a free plan is Promptfoo. The lowest first paid tier on this page is Maxim AI at $29/mo.
When you evaluate prompts and model outputs, LLM evaluation tools offer different ways to measure results and support review. Compare custom metrics, safety evaluations, and LLM-as-a-judge with human review workflows and prompt versioning. CI/CD integration and deployment options show how each tool can connect with your development setup; free plans and paid-from pricing add cost considerations. DeepEval, Promptfoo, and Giskard are among the entries to consider, alongside Braintrust and Confident AI. Think about which evaluation methods and workflow connections matter for your team, then compare the listed capabilities and plans.
29 LLM evaluation tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
12 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | DeepEvalWindows · Mac · Linux · Self-hosted | Three bars | — | 3 of 6 | Free | 6.6 | |
| 2 | PromptfooWeb · Windows · Mac · Linux · Self-hosted · API | Three bars | — | 4 of 6 | Free | 6.6 | |
| 3 | GiskardWeb · Linux · Self-hosted · API | Two bars | — | 2 of 6 | Free | 6.5 | |
| 4 | BraintrustWeb · Self-hosted · API | Two bars | — | 1 of 6 | $249/mo | 6.4 | |
| 5 | Confident AIWeb · Self-hosted · API | Two bars | — | 1 of 6 | $200/mo | 6.4 | |
| 6 | GalileoWeb · Self-hosted · API | Two bars | — | 1 of 6 | $100/mo | 6.4 | |
| 7 | LM Evaluation HarnessLinux · Self-hosted · API | Two bars | — | 1 of 6 | Free | 6.4 | |
| 8 | Maxim AIWeb · Self-hosted · API | Two bars | — | 1 of 6 | $29/mo | 6.4 | |
| 9 | Parea AIWeb · Self-hosted · API | Two bars | — | 1 of 6 | $150/mo | 6.4 | |
| 10 | Inspect AIAPI · Extension | Two bars | — | 0 of 6 | Free | 6.3 | |
| 11 | RAGCheckerSelf-hosted | Two bars | — | 0 of 6 | Free | 6.3 | |
| 12 | LiveBenchWeb · Windows · Mac · Linux | Two bars | — | — | 4 of 6 | — | 5.6 |
| 13 | RagasLinux · Self-hosted · API | One bar | — | — | 1 of 6 | — | 5.5 |
| 14 | ARESLinux · Self-hosted | One bar | — | — | 1 of 6 | — | 5.4 |
| 15 | WhisperWindows · Mac · Linux | One bar | — | — | 3 of 6 | — | 5.4 |
| 16 | DecodingTrustSelf-hosted · API | One bar | — | — | 0 of 6 | — | 5.3 |
| 17 | EvalPlusLinux · Self-hosted · API | One bar | — | — | 1 of 6 | — | 5.3 |
| 18 | garakWindows · Mac · Linux | One bar | — | — | 3 of 6 | — | 5.3 |
| 19 | SWE-benchWeb · Mac · Linux | One bar | — | — | 3 of 6 | — | 5.3 |
| 20 | WebArenaSelf-hosted | One bar | — | — | 0 of 6 | — | 5.3 |
| 21 | Arena (formerly Chatbot Arena)Web | No signal | — | — | 1 of 6 | — | 5.2 |
| 22 | HarmBenchLinux | No signal | — | — | 1 of 6 | — | 5.2 |
| 23 | HELMWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 24 | OpenCompassLinux · Self-hosted · API | One bar | — | 1 of 6 | Free | 5.2 | |
| 25 | Parler-TTSNo platforms listed | No signal | — | — | 0 of 6 | — | 5.2 |
Compare all 25 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Deployment options | Custom metrics |
|---|---|---|---|---|---|---|---|---|
| 1 | DeepEval | 6.6 | Free plan | Free | Yes | — | both | Yes |
| 2 | Promptfoo | 6.6 | Free plan | Free | Yes | — | both | Yes |
| 3 | Giskard | 6.5 | Free plan | Free | Yes | — | both | Yes |
| 4 | Braintrust | 6.4 | Free plan | $249/mo | Yes | 249 /mo | both | Yes |
| 5 | Confident AI | 6.4 | Free plan | $200/mo | Yes | 200 /mo | both | Yes |
| 6 | Galileo | 6.4 | Free plan | $100/mo | Yes | 100 /mo | both | Yes |
| 7 | LM Evaluation Harness | 6.4 | Free plan | Free | — | — | self-hosted | Yes |
| 8 | Maxim AI | 6.4 | Free plan | $29/mo | Yes | — | both | Yes |
| 9 | Parea AI | 6.4 | Free plan | $150/mo | Yes | — | both | Yes |
| 10 | Inspect AI | 6.3 | Free plan | Free | — | — | self-hosted | Yes |
| 11 | RAGChecker | 6.3 | Free plan | Free | — | — | self-hosted | No |
| 12 | LiveBench | 5.6 | No | — | — | — | both | — |
| 13 | Ragas | 5.5 | No | — | Yes | — | self-hosted | Yes |
| 14 | ARES | 5.4 | No | — | — | — | self-hosted | — |
| 15 | Whisper | 5.4 | No | — | Yes | — | both | Yes |
| 16 | DecodingTrust | 5.3 | No | — | — | — | self-hosted | — |
| 17 | EvalPlus | 5.3 | No | — | — | — | self-hosted | — |
| 18 | garak | 5.3 | No | — | Yes | — | self-hosted | Yes |
| 19 | SWE-bench | 5.3 | No | — | Yes | — | both | — |
| 20 | WebArena | 5.3 | No | — | — | — | both | — |
| 21 | Arena (formerly Chatbot Arena) | 5.2 | No | — | Yes | — | cloud | — |
| 22 | HarmBench | 5.2 | No | — | Yes | — | self-hosted | — |
| 23 | HELM | 5.2 | No | — | — | — | self-hosted | Yes |
| 24 | OpenCompass | 5.2 | Free plan | Free | Yes | — | self-hosted | Yes |
| 25 | Parler-TTS | 5.2 | No | — | — | — | self-hosted | Yes |
Is your app on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which LLM evaluation tool is ranked first on Freedom251?
DeepEval is ranked #1 of 29 with a score of 6.6. Promptfoo is second and Giskard third.
How many of these have a free plan?
12 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Maxim AI has the lowest first paid tier we found: $29/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.