What else does CallHub use?

Cloudflare, HubSpot, Plivo, Twilio and CleverTap, among 29 vendors we hold evidence for.

Which other companies use OpenAI?

10Web, 12ui, 15Five, 1K4.AI and 1mind AI, among 3,324 companies with public evidence.

Yes. We hold strong evidence for this. Evidence: Subprocessor list.

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.

Subprocessor listNamed as OpenAI, Inc.Processes data for the company8 Nov 2026Source

CallHub provides calling, texting, and email tools for campaign outreach. It serves advocacy groups, unions, nonprofits, and political campaigns.

Summarized from its homepage on 8 Nov 2026.

CallHub has evidence for 29 vendors. The strongest:

See CallHub's full stack with a source for every vendor, and ask the same question about any company from the API, Claude or your browser.