Fiddler AI vs WhyLabs
Both compete in Observability & Monitoring. Fiddler AI positions itself as “Enterprise AI observability, security, and governance control plane for models and agents”, while WhyLabsleads with “Privacy-preserving AI observability via open-source whylogs and LangKit (acquired by Apple)”. The table below compares what each publishes.
Where Fiddler AI pulls ahead
Publishes support for EU AI Act, NIST AI RMF, GDPR, HIPAA, which WhyLabs does not. Regulated enterprises needing a single platform for ML, LLM, and agent observability with strong explainability and governance/audit capabilities.
Where WhyLabs pulls ahead
Teams seeking free, open-source, privacy-preserving ML and data monitoring via whylogs and LangKit, rather than a supported commercial product.
| Positioning | Enterprise AI observability, security, and governance control plane for models and agents | Privacy-preserving AI observability via open-source whylogs and LangKit (acquired by Apple) |
|---|---|---|
| Category | Observability & Monitoring | Observability & Monitoring |
| Frameworks | EU AI Act, NIST AI RMF, GDPR, HIPAA | None published |
| Deployment | SaaS, Cloud, On-prem, API | Open-source, SaaS, API |
| Built for | GRC, Compliance, Risk, Data Science / ML, Security | Data Science / ML |
| Founded | 2018 | 2019 |
| Headquarters | Palo Alto, California, USA | Seattle, Washington, USA |
| Ownership | Private, independent; venture-backed | Acquired by Apple (deal dated January 2025); commercial operations discontinued and founding team joined Apple; platform released as open source. No longer an independent vendor as of mid-2026. |
| Funding | Approximately $100M total as of 2026; $30M Series C led by RPS Ventures (Jan 2026), following a $32M Series B (2021). Investors include Insight Partners, Lightspeed, Lux Capital, and Capgemini Ventures. | Approximately $14M raised before acquisition, including a ~$10M Series A; backed by AI Fund, Madrona Venture Group, and Jeff Bezos. |
| Pricing | Enterprise subscription; custom pricing via sales/demo (no public self-serve tiers) | Formerly freemium SaaS; now open-source only (whylogs, LangKit) with no commercial offering or vendor support |
| Key capabilities |
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| Integrations | Amazon SageMaker, Google Cloud Vertex AI, NVIDIA NIM, NVIDIA NeMo Guardrails, Databricks, Datadog | Apache Spark, MLflow, Amazon SageMaker |
| Notable customers | Brex, BigaBid | None published |
| Best for | Regulated enterprises needing a single platform for ML, LLM, and agent observability with strong explainability and governance/audit capabilities. | Teams seeking free, open-source, privacy-preserving ML and data monitoring via whylogs and LangKit, rather than a supported commercial product. |
| Limitations | Enterprise-focused with custom pricing and no transparent public tiers; the breadth across ML, LLM, and agents can mean a steeper setup and learning curve for smaller teams. | No longer an independent commercial vendor - acquired by Apple in 2025 and operations discontinued; only the open-source projects remain, with no vendor support, SLAs, or active product roadmap. |
Which should you shortlist?
Choose Fiddler AI if regulated enterprises needing a single platform for ML, LLM, and agent observability with strong explainability and governance/audit capabilities.
Choose WhyLabs if teams seeking free, open-source, privacy-preserving ML and data monitoring via whylogs and LangKit, rather than a supported commercial product.
Neither is a substitute for a governance program. Whichever you pick, you still need people who can define the policies the tool enforces.
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