Vellum suits individuals looking for an AI assistant to handle personal tasks across files, calendars, email, code, and computer controls.
Free plan Open source From $30 a month AndroidiPhone & iPadWebWindowsMacBrowser extension+2
Best AI LLM Evaluation Tools 2026
Evaluating language-model tools starts with what you need to assess: outputs, prompts, or safety behavior. The ranked entries begin with DeepEval, Opik, and Langfuse. Compare evaluation methods, model support, and safety evaluations to understand the kinds of assessment covered. Prompt versioning can help you weigh tools when tracking prompt changes matters; API access and deployment provide additional comparison points for fitting a tool into a workflow. Free-plan availability and starting paid prices bring access and cost into the picture. Consider the evaluation tasks you have in mind, then compare them with the listed features and ranking order.
02
Weights & Biases
It suits AI developers working on model training, fine-tuning, AI application development, or production monitoring.
AndroidiPhone & iPadWeb+5 Record6.3 Visit
03
Evidently AI
Evidently AI suits teams evaluating or monitoring language models, RAG applications, agents, or predictive ML workflows.
WebWindowsMac+3 Record6.1 Visit
04
Opik
Opik suits teams developing applications or agents that call an LLM and need to inspect, evaluate, and monitor their behavior.
WebWindowsMac+3 Record6.1 Visit
05
DeepEval
DeepEval suits developers building repeatable evaluations for AI systems, especially those running tests in Python or CI/CD.
WebWindowsMac+3 Record6.0 Visit
6
Langfuse
WebLinuxAPI+1 $29 a month Record5.7 Visit Langfuse suits teams building AI agent applications that need tracing, prompt management, and evaluation tools.
7
LangWatch
WebMacLinux+2 €29 a month Record5.7 Visit LangWatch suits AI teams working on agents, including developers, product owners, QA, and domain experts involved in evaluation workflows.
8
LangSmith
WebWindowsMac+3 $39 usage-based Record5.3 Visit LangSmith suits teams developing AI agents that need evaluation, prompt tools, tracing, and production monitoring.
9
Maxim AI
WebAPISelf-hosted $29 a month Record5.3 Visit It is designed for cross-functional AI teams, including product managers who want to define and analyze evaluations without code and developers who use SDKs, a CLI, or…
10
Promptfoo
WebWindowsMac+3 Free plan Record5.3 Visit Promptfoo is for developers and enterprises building AI applications who need prompt evaluation or red-team testing.
11
Giskard
WebLinuxAPI+1 Free plan Record5.2 Visit It suits teams assessing conversational AI agents for safety and quality issues before production.
12
Braintrust
WebAPISelf-hosted $249 a month Record5.0 Visit Braintrust is intended for teams running AI agents in production, from early-stage projects to enterprise deployments.
13
Confident AI
WebAPISelf-hosted $200 a month Record4.9 Visit It is designed for engineers, QA teams, product managers, subject-matter experts, and annotators working on AI quality, evaluation, or production monitoring.
14
Rhesis AI
WebLinuxAPI+1 Free plan Record4.8 Visit Rhesis is intended for domain experts, engineers, and product managers working on AI agents.
16
Galileo
WebAPISelf-hosted $100 a month, billed yearly Record4.5 Visit Galileo is designed for engineers, product managers, and subject matter experts building AI applications.
17
HELM
WebAPISelf-hosted Free plan Record4.5 Visit HELM suits teams and researchers who want an open-source framework for evaluating foundation models and can run it themselves.
18
NVIDIA NeMo Evaluator
LinuxAPISelf-hosted Free plan Record4.5 Visit NeMo Evaluator suits developers and research, development, or testing teams assessing LLMs, RAG systems, and agents.
19
Arize Phoenix
WebAPISelf-hosted Free plan Record4.4 Visit Phoenix suits teams that need to inspect AI application traces and compare evaluation results across versions.
20
HoneyHive
WebAPISelf-hosted Free plan Record4.4 Visit It suits AI platform teams, AI engineers, domain experts, and risk and governance teams that need production agent visibility.
23
LM Evaluation Harness
LinuxAPISelf-hosted Free plan Record4.3 Visit It suits researchers, organizations, and developers evaluating language models with shared benchmarks or custom metrics.
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