Best AI Agent Observability Tools in 2026
Updated
In short: W&B Weave is ranked #1 of 32 as of 4 October 2026, ahead of SigNoz and Opik. The best-ranked option with a free plan is SigNoz. The lowest first paid tier on this page is Amazon Bedrock Data Automation at $0.01/mo.
When you need visibility into AI agent activity, compare the ways each tool exposes prompts, tool use, sessions, and costs. Agent framework support and prompt and tool tracing help assess what can be inspected; session replay and trace retention show other aspects of reviewing activity over time. W&B Weave, SigNoz, and Opik are among the entries to explore. Also weigh deployment options, free-plan availability, and paid-from pricing. The right combination depends on what you need to observe and how long you need traces retained.
32 AI agent observability tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
AI Agent Observability Tools, ranked on how quickly a newcomer can get going. 21 of the 25 on this page can be tried for free.
- 1 W&B WeavePaid from $60/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 2 SigNozPaid from $19/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 3 OpikPaid from $19/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 4 TracciaPaid from $99/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 5 VoltOpsPaid from $50/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 6 HeliconePaid from $79/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 7 Maxim AIPaid from $29/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 8 PetalTraceFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 9 Respan (formerly Keywords AI)Paid from $16.58/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 10 OpenLITFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 11 AgentaPaid from $29/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 12 TraceRootPaid from $30/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 13 Arize AXPaid from $50/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 14 BraintrustPaid from $249/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 15 GalileoPaid from $100/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 16 LaminarPaid from $30/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 17 LangfusePaid from $29/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 18 LogicGazeFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 19 MLflow TracingFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 20 TraceloopFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 21 Observe
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 22 Amazon Bedrock Data AutomationPaid from $0.01/mo
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 23 Hexel
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 24 AgentOps
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 25 Fiddler AI
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which AI agent observability tool is ranked first on The Geeks Club?
W&B Weave is ranked #1 of 32 with a score of 7.9. SigNoz is second and Opik third.
How many of these have a free plan?
20 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Amazon Bedrock Data Automation has the lowest first paid tier we found: $0.01/mo.
How is this list ranked?
Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on. Paid placements never change a rank.