Best AI Agent Observability Tools in 2026
Updated
32 AI agent observability tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
32ranked
0free plans on this page
4 Oct 2026last checked
0 of the 7 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 26 | Fiddler AIWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 27 | HexelNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 28 | HoneyHiveWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 29 | LangSmithWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 30 | Amazon Nova ReelAPI | One bar | — | — | 0 of 6 | — | 4.8 |
| 31 | Kosmoy AI ObservabilityWeb | No signal | — | — | 1 of 6 | — | 4.8 |
| 32 | LunaryWeb | No signal | — | — | 1 of 6 | — | 4.7 |
