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Best Respan (formerly Keywords AI) Alternatives in 2026

Updated

20 apps from AI agent observability tools ranked against Respan (formerly Keywords AI) on the same published basis.

  1. 1
    PetalTrace Free plan apiLinuxMacself-hostedWeb Free6.7
    Respan (formerly Keywords AI) vs PetalTrace
  2. 2
    OpenLIT Free plan apiLinuxMacself-hostedWeb Free6.6
    Respan (formerly Keywords AI) vs OpenLIT
  3. 3
    W&B Weave Free plan apiLinuxMacself-hostedWeb $60/mo6.6
    Respan (formerly Keywords AI) vs W&B Weave
  4. 4
    Opik Free plan apiLinuxself-hostedWeb $19/mo6.5
    Respan (formerly Keywords AI) vs Opik
  5. 5
    SigNoz Free plan AndroidapiiOSself-hostedWeb $19/mo6.5
    Respan (formerly Keywords AI) vs SigNoz
  6. 6
    Agenta Free plan apiself-hostedWeb $29/mo6.4
    Respan (formerly Keywords AI) vs Agenta
  7. 7
    Arize AX Free plan apiself-hostedWeb $50/mo6.4
    Respan (formerly Keywords AI) vs Arize AX
  8. 8
    Braintrust Free plan apiself-hostedWeb $249/mo6.4
    Respan (formerly Keywords AI) vs Braintrust
  9. 9
    Fiddler AI Free plan apiself-hostedWeb Free6.4
    Respan (formerly Keywords AI) vs Fiddler AI
  10. 10
    Galileo Free plan apiself-hostedWeb $100/mo6.4
    Respan (formerly Keywords AI) vs Galileo
  11. 11
    Helicone Free plan apiself-hostedWeb $79/mo6.4
    Respan (formerly Keywords AI) vs Helicone
  12. 12
    HoneyHive Free plan apiself-hostedWeb Free6.4
    Respan (formerly Keywords AI) vs HoneyHive
  13. 13
    Laminar Free plan apiself-hostedWeb $30/mo6.4
    Respan (formerly Keywords AI) vs Laminar
  14. 14
    Langfuse Free plan apiself-hostedWeb $29/mo6.4
    Respan (formerly Keywords AI) vs Langfuse
  15. 15
    LangSmith Free plan apiself-hostedWeb $39/mo6.4
    Respan (formerly Keywords AI) vs LangSmith
  16. 16
    LangWatch Free plan apiLinuxself-hostedWeb €29/mo6.4
    Respan (formerly Keywords AI) vs LangWatch
  17. 17
    LogicGaze Free plan apiself-hostedWeb Free6.4
    Respan (formerly Keywords AI) vs LogicGaze
  18. 18
    Maxim AI Free plan apiself-hostedWeb $29/mo6.4
    Respan (formerly Keywords AI) vs Maxim AI
  19. 19
    MLflow Tracing Free plan apiself-hostedWeb Free6.4
    Respan (formerly Keywords AI) vs MLflow Tracing
  20. 21
    Traccia Free plan apiWeb $99/mo6.4
    Respan (formerly Keywords AI) vs Traccia

Respan (formerly Keywords AI) alternatives compared

#AppScoreFree planFromRuns on
1PetalTrace6.7Free planFreeAPI, Linux, Mac, self-hosted, Web, Windows
2OpenLIT6.6Free planFreeAPI, Linux, Mac, self-hosted, Web, Windows
3W&B Weave6.6Free plan$60/moAPI, Linux, Mac, self-hosted, Web, Windows
4Opik6.5Free plan$19/moAPI, Linux, self-hosted, Web
5SigNoz6.5Free plan$19/moAndroid, API, iOS, self-hosted, Web
6Agenta6.4Free plan$29/moAPI, self-hosted, Web
7Arize AX6.4Free plan$50/moAPI, self-hosted, Web
8Braintrust6.4Free plan$249/moAPI, self-hosted, Web
9Fiddler AI6.4Free planFreeAPI, self-hosted, Web
10Galileo6.4Free plan$100/moAPI, self-hosted, Web
11Helicone6.4Free plan$79/moAPI, self-hosted, Web
12HoneyHive6.4Free planFreeAPI, self-hosted, Web
13Laminar6.4Free plan$30/moAPI, self-hosted, Web
14Langfuse6.4Free plan$29/moAPI, self-hosted, Web
15LangSmith6.4Free plan$39/moAPI, self-hosted, Web
16LangWatch6.4Free plan€29/moAPI, Linux, self-hosted, Web
17LogicGaze6.4Free planFreeAPI, self-hosted, Web
18Maxim AI6.4Free plan$29/moAPI, self-hosted, Web
19MLflow Tracing6.4Free planFreeAPI, self-hosted, Web
21Traccia6.4Free plan$99/moAPI, Web
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Questions about Respan (formerly Keywords AI) alternatives

What is the best alternative to Respan (formerly Keywords 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 Respan (formerly Keywords 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.