Weave suits teams building or operating production AI agents that need tracing, evaluations, interaction monitoring, or prompt comparisons.
Free plan Free trial Open source From $60 a month iPhone & iPadWebWindowsMacLinuxAPI+1
Best AI Agent Observability Tools 2026
Facts read 29 Sep 2026 – 21 Oct 2026
When you need visibility into AI agent activity, observability tools can be compared by the traces and session details they make available. Check agent framework support alongside prompt and tool tracing, session replay, and trace retention to understand what you can inspect and for how long. Cost tracking, deployment options, free-plan availability, and paid-from pricing add further comparison points. SigNoz, Agenta, and PetalTrace are among the named options, along with Traccia and TraceRoot. The right balance depends on what you need to review across agent sessions, how you plan to deploy, and which cost information you want to track. Use the listed capabilities and access details to weigh those needs.
The standings: top 10
| Name | In a line | Record score | Price from | Try it free | Runs on | Facts read |
|---|---|---|---|---|---|---|
| 01 W&B Weave | Weave suits teams building or operating production AI agents that need tracing, evaluations, interaction monitoring, or prompt comparisons. | 6.2 | $60 a month | Free plan | iPhone & iPad, Web, Windows, Mac | 20 Oct 2026 |
| 02 Opik | Opik suits teams developing applications or agents that call an LLM and need to inspect, evaluate, and monitor their behavior. | 6.1 | $19 a month | Free plan | Web, Windows, Mac, Linux | 21 Oct 2026 |
| 03 SigNoz | SigNoz suits teams monitoring application and infrastructure telemetry across logs, metrics, traces and exceptions. | 5.8 | $19 a month | Free plan | Android, iPhone & iPad, Web, API | 1 Oct 2026 |
| 04 Langfuse | Langfuse suits teams building AI agent applications that need tracing, prompt management, and evaluation tools. | 5.7 | $29 a month | Free plan | Web, Linux, API, Self-hosted | 15 Oct 2026 |
| 05 LangWatch | LangWatch suits AI teams working on agents, including developers, product owners, QA, and domain experts involved in evaluation workflows. | 5.7 | €29 a month | Free plan | Web, Mac, Linux, API | 21 Oct 2026 |
| 06 Agenta | Agenta suits teams that want to create and operate AI agents across work tools, with cloud or self-hosted deployment options. | 5.5 | $29 a month | Free plan | Web, API, Self-hosted | 14 Oct 2026 |
| 07 OpenLIT | OpenLIT suits developers who want to observe LLM applications, prompts, evaluations, and costs. | 5.5 | Free plan | Free plan | Web, Windows, Mac, Linux | 14 Oct 2026 |
| 08 LangSmith | LangSmith suits teams developing AI agents that need evaluation, prompt tools, tracing, and production monitoring. | 5.3 | $39 usage-based | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 09 Maxim AI | 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… | 5.2 | $29 a month | Free plan | Web, API, Self-hosted | 2 Oct 2026 |
| 10 Observe | 5.1 | — | Free trial | Web, Windows, Mac, Linux | 3 Oct 2026 |
02
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
03
SigNoz
SigNoz suits teams monitoring application and infrastructure telemetry across logs, metrics, traces and exceptions.
AndroidiPhone & iPadWeb+2 Record5.8 Visit
04
Langfuse
Langfuse suits teams building AI agent applications that need tracing, prompt management, and evaluation tools.
WebLinuxAPI+1 Record5.7 Visit
05
LangWatch
LangWatch suits AI teams working on agents, including developers, product owners, QA, and domain experts involved in evaluation workflows.
WebMacLinux+2 Record5.7 Visit
6
Agenta
WebAPISelf-hosted $29 a month Record5.5 Visit Agenta suits teams that want to create and operate AI agents across work tools, with cloud or self-hosted deployment options.
7
OpenLIT
WebWindowsMac+3 Free plan Record5.5 Visit OpenLIT suits developers who want to observe LLM applications, prompts, evaluations, and costs.
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 Record5.2 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…
11
Traccia
WebAPI $99 a month Record5.1 Visit Traccia suits teams that need to inspect agent runs, evaluate outputs, or enforce limits on calls.
12
VoltOps
WebAPISelf-hosted $50 a month Record5.1 Visit VoltOps suits teams managing AI agents, from small teams using Core to larger teams with advanced needs on Pro.
14
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.
15
Helicone
WebAPISelf-hosted $79 usage-based Record5.0 Visit It suits teams building or operating AI applications that need provider routing, request tracing, or cost visibility.
17
PetalTrace
WebWindowsMac+3 Free plan Record5.0 Visit PetalTrace suits developers who need to inspect and compare AI agent workflows.
20
Respan (formerly Keywords AI)
WebAPISelf-hosted $199 a year Record4.8 Visit Respan suits startup and enterprise teams tracing workflows, evaluating agent behavior, and monitoring production AI systems.
21
Fiddler AI
WebAPISelf-hosted Free plan Record4.7 Visit Fiddler AI is aimed at enterprises managing AI agents and predictive applications at scale, including teams that need monitoring, guardrails, and audit evidence.
22
Laminar
WebAPISelf-hosted $30 a month Record4.7 Visit Laminar suits teams building AI agents that need to trace model and tool activity, investigate runs, or evaluate changes against datasets.
23
TraceRoot
Web $30 a month Record4.6 Visit TraceRoot suits teams operating AI agents that want to detect production issues and investigate fixes against code and GitHub history.
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