Plain is the AI support stack built for B2B teams. Composable infrastructure that gives you complete flexibility to build a support motion that grows with your business — no-code or all-code.
Summary from the company’s website.
Publicly advertised compliance posture
As observed on September 8, 2026 on the organization’s public trust center.
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SOC 2
Independent CPA audit of controls for security, availability, and confidentiality.
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GDPR
Public claim of alignment with the EU General Data Protection Regulation.
Compliance timeline
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September 8, 2026
Posture last observed by Trust Index
Subprocessors
Third parties Plain discloses on its trust center. Linked entries have their own profile in the Trust Index.
72% chain trust: 23 of 32 disclosed subprocessors are themselves in the Trust Index.
- Amazon Web Services Cloud provider
- Vercel Hosting
- OpenAI AI
- Cloudflare Cloud monitoring
- Attio Sales
- Anthropic AI/LLM Provider
- Baseten Engineering
- Braintrust AI/LLM Provider
- Customer.io Marketing
- Datadog Cloud monitoring
- Google Cloud provider
- HubSpot Marketing
- Hyperline Finance and payments
- Liveblocks Real time and collaboration features
- Linear Product and design
- Keel Engineering
- Nango Integrations
- n8n Workflow automation
- Omni Data analytics
- Polytomic Data storage and processing
- PostHog Data analytics
- Postmark Email processing
- Render Cloud provider
- salesforce CRM integration
- Segment Data analytics
- Supabase Cloud provider
- Stripe Finance and payments
- Slack Collaboration
- Tinybird Data analytics
- Turbopuffer Database & Hosting
- WorkOS Authentication
- xAI Engineering
Named as a subprocessor by
Organizations in the Trust Index that disclose Plain as a subprocessor.
About this data
The Trust Index reports only what organizations publicly advertise. A missing framework here means no public claim was observed as of September 8, 2026; it never means an organization is non-compliant. HIPAA entries reflect a public claim of compliance; no HIPAA certification exists. Corrections are welcome and verified against public evidence. Read the full methodology.
