Does Plain use OpenAI?
Yes
We hold strong evidence for this.
- The company names it in its own subprocessor list, a statement that this vendor handles its customers' data.
How we know
About Plain
Plain provides AI support infrastructure that lets B2B teams build support tools with no-code or all-code options. It serves B2B teams handling customer conversations across channels like Slack, Microsoft Teams, email, and chat.
Summarized from its homepage on 3 Nov 2026.
What else Plain uses
Plain has evidence for 8 vendors. The strongest:
Anthropic
Cloudflare
Framer
Google Analytics
Google Tag Manager
Google Workspace
Vercel
Other companies using OpenAI
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- Every company and vendor, with its public source
- 100 API calls a month, plus MCP and the Chrome extension
- Work email only. No card, no sales call