Technologies / Security and identity / Castle.io
Companies using Castle.io
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.
Seen in4 subprocessor lists
Companies using Castle.io
Subprocessor listPrivacy policyWebsiteJob postings
A company can count under more than one kind of evidence. Our coverage is partial, so this is not everyone using Castle.io.
Questions
How many companies use Castle.io?
4 companies in StrataDB's data have public evidence for Castle.io, and 4 of them name it in their own subprocessor list. Our coverage is partial, so the real number is higher.
Which companies use Castle.io?
Docwize, GitBook, lovable.dev and Signable. Each one links to the evidence behind it.
How does StrataDB know a company uses Castle.io?
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.
Build your list of Castle.io customers
See every company we hold evidence for, with its source, and get an alert when a company adds or drops Castle.io.
- 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