18.7
W&B Weave provides observability and continuous improvement tools for production AI agents.
Free planOpen sourceiOSWebAPI
Best AI Agent Observability Tools in 2026
When you need visibility into AI agent activity, observability tools can help you examine traces, sessions, and usage costs. Compare agent framework support with prompt and tool tracing, session replay, and trace retention to see what each entry lists for reviewing behavior over time. Cost tracking and deployment options add further considerations, while free-plan availability and paid-from pricing can help you…
28.4
Opik helps teams building applications or agents that call an LLM log actions and evaluate behavior through development, testing, and production.
Free planOpen sourceWebAPILinux
38.2
Langfuse is an open-source AI engineering platform for teams debugging, analyzing, and iterating on AI agent applications.
Free planOpen sourceWebAPILinux
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LangWatch
LangWatch is an AI agent engineering platform for teams preparing agents for production.
Free planOpen sourceWebAPILinuxmacOS8.2From €29 a month - 5
Agenta
Agenta is an open-source workspace for teams to build, use, and automate AI coworkers.
Free planOpen sourceWebAPISelf-hosted8.0From $29 a month - 6
LangSmith
LangSmith is a platform for building, evaluating, deploying, monitoring, and improving AI agents.
Free planWebAPILinuxmacOS8.0$39 usage-based - 7
AgentOps
AgentOps is a developer platform for building AI agents and LLM applications.
Free planOpen sourceWebAPISelf-hosted7.8From $40 a month - 8
Braintrust
Braintrust is an observability platform for teams improving AI agents that run in production.
Free planWebAPISelf-hosted7.7From $249 a month - 9
OpenLIT
OpenLIT is an open-source Agent Harness Engineering platform for LLM tracing, evaluations, prompt management and cost tracking, built on OpenTelemetry.
Free planOpen sourceWebAPILinuxmacOS7.7Free plan - 10
SigNoz
SigNoz is an open-source observability tool for monitoring applications and infrastructure.
Free planAndroidiOSWebAPI7.6From $19 a month - 11
MLflow Tracing
MLflow Tracing records inputs, outputs and metadata from steps in LLM application and agent requests, helping teams investigate bugs and unexpected behavior.
Free planOpen sourceWebAPILinuxSelf-hosted7.2Free plan - 12
Traceloop
Traceloop monitors, debugs, and evaluates applications built with large language models.
Free planOpen sourceWebAPISelf-hosted7.2Free plan - 13
Lunary
Lunary is an AI platform for enterprises and developers building chatbots or other applications powered by large language models.
Open sourceWebAPISelf-hosted7.1From $20 a month - 14
Maxim AI
Maxim AI is an evaluation and observability platform for simulating, assessing, and monitoring AI agents.
Free planWebAPISelf-hosted7.0From $29 a month - 15
PetalTrace
PetalTrace is an open-source observability platform for developers examining AI agent workflows and their execution.
Free planWebAPILinuxmacOS7.0Free plan - 16
Galileo
Galileo is an observability, evaluation, and guardrail platform for generative AI and agentic applications.
Free planWebAPISelf-hosted6.9From $100 a month - 17
Helicone
Helicone is a platform for routing, debugging, and analyzing AI applications.
Free planWebAPISelf-hosted6.9From $79 a month - 18
Arize AX
Arize AX is a platform for improving AI agents by turning production behavior into issues, investigations, evaluations, and experiments.
Free planWebAPISelf-hosted6.8From $50 a month - 19
Laminar
Laminar is an open-source observability and debugging platform for AI agents, designed around OpenTelemetry.
Free planWebAPISelf-hosted6.8From $30 a month - 20
Observe
Observe is an AI-powered observability platform that combines logs, metrics, and traces in a Snowflake lakehouse.
WebAPILinuxmacOS6.8 - 21
Respan (formerly Keywords AI)
Respan (formerly Keywords AI) is an AI gateway with tools for observing, evaluating, and security testing AI systems.
Free planWebAPISelf-hosted6.7From $199 a year - 22
TraceRoot
TraceRoot is an open-source layer for AI agents that detects production failures and helps investigate and address them.
Free planWeb6.7From $30 a month - 23
VoltOps
VoltOps is a console for observing, automating, evaluating, deploying, and managing AI agents, including prompts and guardrails.
Free planWebAPISelf-hosted6.7From $50 a month - 24
Traccia
Traccia is an AI agent control plane for observing activity, evaluating outputs, setting governance controls, and enforcing runtime policies.
Free planWebAPI6.6From $99 a month - 25
Fiddler AI
Free planWebAPISelf-hosted6.4Free plan