Plain
Plain is a B2B support platform with a built-in AI agent called Ari, positioned as composable support infrastructure rather than a fixed helpdesk.
Per-seat tiers with included monthly AI credit allowances, a free trial, and a custom-priced top tier.
Proprietary
Appears in 1 guide
Where it ranks
Guides that include Plain.
Security headers
What Plain's website sends to your browser.
Scanned 2026-08-25. Grade headers F, scoring 35 out of 100.
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No Content-Security-Policy, so no defence in depth against cross-site scripting
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Strict-Transport-Security is set
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X-Content-Type-Options: nosniff is set
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No X-Frame-Options and no CSP frame-ancestors, so clickjacking is possible
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No Referrer-Policy, so full URLs may leak to third parties
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No Permissions-Policy, so powerful browser features are not restricted
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No Cross-Origin-Opener-Policy
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No Cross-Origin-Resource-Policy
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No server-version or X-Powered-By disclosure
This is one narrow, automated check of the HTTP response headers on the vendor's own website. It says nothing about how the product itself is built, how it stores your data, or whether it has ever been audited. A good grade here is a small signal that somebody was paying attention.