Best Fiddler AI Alternatives in 2026
Updated
20 apps from AI agent observability tools ranked against Fiddler AI on the same published basis.
- 1Fiddler AI vs PetalTrace
- 2Fiddler AI vs OpenLIT
- 3Fiddler AI vs W&B Weave
- 4Fiddler AI vs Opik
- 5Fiddler AI vs SigNoz
- 6Fiddler AI vs Agenta
- 7Fiddler AI vs Arize AX
- 8Fiddler AI vs Braintrust
- 10Fiddler AI vs Galileo
- 11Fiddler AI vs Helicone
- 12Fiddler AI vs Laminar
- 13Fiddler AI vs Langfuse
- 14Fiddler AI vs LangSmith
- 15Fiddler AI vs LangWatch
- 16Fiddler AI vs LogicGaze
- 17Fiddler AI vs Maxim AI
- 18Fiddler AI vs MLflow Tracing
- 19Fiddler AI vs Respan (formerly Keywords AI)
- 20Fiddler AI vs Traccia
- 21Fiddler AI vs Traceloop
Fiddler AI alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | PetalTrace | 6.7 | Free plan | Free | API, Linux, Mac, self-hosted, Web, Windows |
| 2 | OpenLIT | 6.6 | Free plan | Free | API, Linux, Mac, self-hosted, Web, Windows |
| 3 | W&B Weave | 6.6 | Free plan | $60/mo | API, Linux, Mac, self-hosted, Web, Windows |
| 4 | Opik | 6.5 | Free plan | $19/mo | API, Linux, self-hosted, Web |
| 5 | SigNoz | 6.5 | Free plan | $19/mo | Android, API, iOS, self-hosted, Web |
| 6 | Agenta | 6.4 | Free plan | $29/mo | API, self-hosted, Web |
| 7 | Arize AX | 6.4 | Free plan | $50/mo | API, self-hosted, Web |
| 8 | Braintrust | 6.4 | Free plan | $249/mo | API, self-hosted, Web |
| 10 | Galileo | 6.4 | Free plan | $100/mo | API, self-hosted, Web |
| 11 | Helicone | 6.4 | Free plan | $79/mo | API, self-hosted, Web |
| 12 | Laminar | 6.4 | Free plan | $30/mo | API, self-hosted, Web |
| 13 | Langfuse | 6.4 | Free plan | $29/mo | API, self-hosted, Web |
| 14 | LangSmith | 6.4 | Free plan | $39/mo | API, self-hosted, Web |
| 15 | LangWatch | 6.4 | Free plan | €29/mo | API, Linux, self-hosted, Web |
| 16 | LogicGaze | 6.4 | Free plan | Free | API, self-hosted, Web |
| 17 | Maxim AI | 6.4 | Free plan | $29/mo | API, self-hosted, Web |
| 18 | MLflow Tracing | 6.4 | Free plan | Free | API, self-hosted, Web |
| 19 | Respan (formerly Keywords AI) | 6.4 | Free plan | $16.58/mo | API, self-hosted, Web |
| 20 | Traccia | 6.4 | Free plan | $99/mo | API, Web |
| 21 | Traceloop | 6.4 | Free plan | Free | API, self-hosted, Web |
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Questions about Fiddler AI alternatives
What is the best alternative to Fiddler AI?
PetalTrace, number 1 in AI agent observability tools with a score of 6.7 out of 10. The others here: OpenLIT, W&B Weave, Opik and 16 more.
What is the best free alternative to Fiddler AI?
PetalTrace is the best-ranked alternative with a free plan. 20 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.