Best AI Agent Observability Tools in 2026
Updated
30 AI agent observability tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
30ranked
0free plans on this page
$0.01/molowest paid tier
4 Oct 2026last checked
Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score
- 26 Fiddler AI No phone app RecognisedPhone appDocumentedFree plan 5.8
- 27 Hexel No phone app RecognisedPhone appDocumentedFree plan 5.4 Trace retention: 30 daysSession replay: Yes
- 28 Amazon Bedrock Data AutomationAmazon Web Services No phone app RecognisedPhone appDocumentedFree plan 5.4$0.01/mo
- 29 Observe No phone app RecognisedPhone appDocumentedFree plan 5.2
- 30 Kosmoy AI Observability No phone app RecognisedPhone appDocumentedFree plan 5.0 Session replay: YesPrompt and tool tracing: Yes
Compare all 5 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Trace retention | Session replay |
|---|---|---|---|---|---|---|---|---|
| 26 | Fiddler AI | 5.8 | No | — | Yes | — | — | — |
| 27 | Hexel | 5.4 | No | — | Yes | — | 30 days | Yes |
| 28 | Amazon Bedrock Data Automation | 5.4 | No | $0.01/mo | — | — | — | — |
| 29 | Observe | 5.2 | No | — | No | — | — | — |
| 30 | Kosmoy AI Observability | 5.0 | No | — | No | — | — | Yes |