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Technologies / Castle.io / Cloudflare

Companies using Castle.io and Cloudflare

4 companies in our data have public evidence for both Castle.io and Cloudflare, 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.

4companies use both
100%of Castle.io users
under 1%of Cloudflare 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.ioCloudflare
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GitBookgitbook.comGitBook is a documentation platform that flags outdated content and fixes it.Developer tools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
Signablesignable.comSignable provides electronic signature software for sending, signing, and tracking documents.

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.

100% of the 4 companies we see using Castle.io also show the other.

All 4 companies using Castle.ioMore in Security and identity

Cloudflare

Cloud and infrastructure

Cloudflare is a platform for building, securing, and scaling applications, agents, and workforce workloads without managing infrastructure. It is used to run security, connectivity, and code on a global network close to users, applications, and sites.

Summarized from cloudflare.com on 8 Nov 2026.

under 1% of the 22,927 companies we see using Cloudflare also show the other.

All 22,927 companies using Cloudflare2,133 name it as a subprocessorMore in Cloud and infrastructure

Other pairs

Companies with their own evidence for both.

More with Cloudflare

Google Workspace14,093companiesGoogle Tag Manager9,079companiesGoogle Analytics8,129companiesNext.js6,283companiesAmazon Web Services5,279companiesVercel4,737companies

Questions

How many companies use both Castle.io and Cloudflare?

4 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 Cloudflare?

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

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

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 Cloudflare

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