Free and open first
Best AI Agent Evaluation Tools in 2026
When you need to assess an AI agent, the useful comparison is what each tool can evaluate and what evidence it can bring into view. Compared on evaluation methods, tool-call checks, safety evaluations, and trace ingestion, these options offer different ways to examine behavior. SDK language support and dataset limits may shape how they fit your workflow, while regression runs can help you compare changes. Check free plans and paid-from pricing alongside those capabilities. Future AGI AI Evaluation SDK, Promptfoo, and W&B Weave are among the tools to consider, with DeepEval and Noveum also represented among the entries.
- 28 apps
- Research read 23 Sept 2026
- How the order is worked out
- 1
DeepEval
Free plan Open source APILinuxMac+3DeepEval offers a broad toolkit for evaluating AI systems across modalities, metrics, and agent workflows.
- 2
Future AGI AI Evaluation SDK
Free plan Open source APILinuxMac+3Future AGI brings evaluation, tracing, and simulation together for teams building AI agents, with several deployment options.
- 3
Giskard
Free plan Open source APILinuxSelf-hosted+1 - 4
LangWatch
Free plan Open source APILinuxMac+2LangWatch brings agent simulation, evaluation, tracing, and deployment options together for teams working toward production.
- 5
Opik
Free plan Open source APILinuxMac+3Opik brings tracing, evaluation, testing, and production monitoring into one platform, with both cloud and self-hosted options.
- 6
Promptfoo
Free plan Open source APILinuxMac+3Promptfoo combines prompt evaluation with red-team testing and a broad provider and integration list.
- 7
W&B Weave
Free plan Open source APIiPhoneLinux+4W&B Weave brings tracing, evaluation, monitoring, and safety scoring together for production AI agents.
- 8
TruLens
Free plan Open source APISelf-hostedTruLens offers tracing, evaluation, and version comparison for AI applications, with customizable metrics and self-hosted storage options.
- 9
AgentClash
Free plan APISelf-hostedWebAgentClash combines sandboxed agent evaluation with replayable regression tests and CI/CD checks.
- 10
Arklex
Free plan APILinuxSelf-hostedArklex combines agent simulations, scoring, human review, and regression checks, with both an open-source framework and a hosted UI.
- 11
Braintrust
Free plan APISelf-hostedWebBraintrust combines production trace inspection with dataset evaluations and prompt iteration.
- 12
Galileo
Free plan APISelf-hostedWebGalileo combines evaluation, observability, and guardrails with several deployment options and developer interfaces. Check the trace allowance and SSO availability against your deployment needs.
- 13
LangSmith
Free plan APILinuxMac+3LangSmith combines agent evaluation with prompt tools and observability, including cost and trajectory tracking.
- 14
HoneyHive
Free plan APISelf-hostedWebHoneyHive covers trace inspection, evaluations, live monitoring, and version experiments for AI agents. Teams should compare the free plan’s limits with their event volume and retention needs.
- 15
Noveum
Free plan APILinuxSelf-hosted+1Noveum combines agent tracing, evaluation, and a workflow for validating fixes. Its free plan and deployment options vary in scope, and unused monthly credits expire at each billing cycle.
- 16
Maxim AI
Free plan APISelf-hostedWebMaxim AI brings prompt work, agent evaluation, and production observability into one platform.
- 17
MLflow GenAI Evaluation
Free plan APISelf-hostedWebMLflow GenAI Evaluation combines dataset management, scoring, feedback, and production tracing in one offering.
- 18
Inspect AI
Free plan APIExtensionChoose Inspect AI if you need a free, self-hosted framework to evaluate language models across varied task types, with broad provider and agent support.
- 19
Parea AI
Free plan APISelf-hostedWebParea combines LLM evaluation, prompt workflows, observability, and human review. Its free tier has stated team, log, retention, and prompt limits; the Team plan is $150 a month.
- 20
Strands Evals
Free plan APILinuxMac+2Strands Evals provides SDK and CLI workflows for agent evaluation, including deterministic checks and trace-based runs.
- 21
OpenAgent Eval
Free plan APILinuxMac+2OpenAgent Eval provides local evaluation workflows with broad provider and retriever integrations. Its dependency requirements and Python version should be planned before installation.
- 22
Tangle
Free plan APILinuxWebTangle combines agent sandboxes, run records, analysis, and review outputs, with a separate model router.
- 23
VRUNAI
Free plan WebVRUNAI combines agent scenario checks with consistency and cost tracking across a broad list of providers.
- 24
Sensei
Free plan APISensei provides an open-source, suite-based way to measure AI-agent performance and repeat evaluations.
- 25
Benchboard
Free trial WebBenchboard combines structured agent scoring, safety review, repeat evaluations, and shareable evidence.
6.1 Visit site
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price
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