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Technologies / Castle.io / OpenAI

Companies using Castle.io and OpenAI

3 companies in our data have public evidence for both Castle.io and OpenAI, and 3 name both in their own subprocessor list. Each company below links to the source for every claim. Our coverage is partial, so this is not everyone.

3companies use both
75%of Castle.io users
under 1%of OpenAI users
3name both as subprocessors

The companies

Strongest evidence first: a company naming both in its own subprocessor list comes before one seen on its website or in job postings.

Subprocessor listPrivacy policyWebsiteJob postings

CompanyCastle.ioOpenAI
Docwizedocwize.comDocwize provides document management and workflow automation software for legal, finance, construction, HR, and operations teams.Legal
GitBookgitbook.comGitBook is a documentation platform that flags outdated content and fixes it.Developer tools
lovable.dev

The two technologies

Castle.io

Security and identity

Castle.io is a suite of APIs for bot detection and abuse prevention. It is used to stop bots and fraud through behavioral analysis.

Summarized from docs.castle.io on 8 Nov 2026.

75% of the 4 companies we see using Castle.io also show the other.

All 4 companies using Castle.ioMore in Security and identity

OpenAI

AI and LLM providers

OpenAI is a platform that provides an API for building with OpenAI models. It is used to access models, tools, and services for tasks such as text generation, image generation, audio, and agents.

Summarized from developers.openai.com on 8 Nov 2026.

under 1% of the 3,304 companies we see using OpenAI also show the other.

All 3,304 companies using OpenAI2,530 name it as a subprocessorMore in AI and LLM providers

Other pairs

Companies with their own evidence for both.

More with OpenAI

Cloudflare3,289companiesGoogle Workspace2,481companiesAnthropic1,998companiesAmazon Web Services1,890companiesStripe1,652companiesGoogle1,552companies

Questions

How many companies use both Castle.io and OpenAI?

3 companies in StrataDB's data have public evidence for both, and 3 of them name both in their own subprocessor list, the strongest evidence we hold. Our coverage is partial, so the real number is higher.

Which companies use Castle.io and OpenAI?

Docwize, GitBook and lovable.dev. Each one links to the evidence behind it.

How does StrataDB know a company uses Castle.io and OpenAI?

From four kinds of public evidence: subprocessor lists, privacy policies, website code and job postings. Each is kept apart with its source and the date we saw it. A company missing here means we found no evidence, not that it does not use them.

Find every company using Castle.io and OpenAI

See the full list with the source for each company, and run the same lookup for any technology from the API, Claude or your browser.

  • 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