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castle.io

Castle

Who runs Castle, what it tracks and what it costs, and the 20 closest fraud prevention software alternatives.

Who’s behind it
Not stated
Online since
Unknown
Trackers
Prices
No pricing page
Last price change
–
Closest alternative
Fingerprint

Measured from Castle’s own pages, the Internet Archive and public records. Hover a dotted value for its source and date.

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01 · Who’s behind it

Who runs Castle

Castle castle.io

A complete suite of SDKs and APIs to monitor users, block bots, and stop in-app fraud.

Company
No imprint we could read
Online since
Not in the Internet Archive
Audience
In English

02 · Privacy

What Castle tracks

What the homepage loads before you accept or decline cookies. A cookie banner should hold most of it back until you agree, and a tag manager can load more that we don’t see.

tracker that follows visitors

1 of the 19 alternatives below have fewer, 14 have more.

Privacy-friendly alternatives →
Cookie banner
None found

  • Visitor analytics

    Counts and follows visits, usually with cookies.

03 · Alternatives

Alternatives to Castle

Thumbs up if it’s a real alternative to Castle, thumbs down if it isn’t.

Fewer trackers than CastleNo ad trackersRegistered in the EUFree planOnly in English

2 of the 60 sites closest to Castle match.

  1. 01
    Semrush semrush.com Top 10K English Free plan 2 trackers

    Semrush: Your Unfair Advantage for Growing Brand Visibility

    Semrush is the leading platform to grow and measure brand visibility across AI search, SEO, PPC, social, and more.

    Compare Semrush with Castle →
  2. 02
    GitLab gitlab.com Top 1K English Free plan 2 trackers

    GitLab - Speed with control for agentic software engineering

    Teams and agents ship trusted software faster with GitLab, the intelligent orchestration platform with context and governance for the entire software lifecycle.

    Compare GitLab with Castle →

Closest first, by how much each site’s offer resembles Castle’s. Trackers are counted the same way as above. Highlighted technologies are ones Castle uses too. Votes and comments come from visitors and don’t change the order.

04 · History

What changed

Price and policy history →

No changes yet. Each new crawl is compared with the last one, and what Castle adds, drops or rewrites shows up here.

05 · Details

How we measure

Alternatives are matched by what sites actually offer, from their homepages, Wikidata and a summary by Claude, in any language. Trackers and the rest of the stack come from the homepage’s code and DNS records.

The full technology stack and search numbers · 11 technologies
Neighbours
k = 60
Sites searched
9,213
Vector
384-d
Query
41 ms

Built with

JavaScript frameworks
  • Astro meta generator: Astro v5.17.2
Analytics
  • PostHog page source: posthog.init(
Hosting
  • Netlify header x-nf-request-id: 01M6YG7TMY8M0FJS3EYEM3EXX2
Email hosting
Email delivery
  • SendGrid TXT v=spf1 include:_spf.google.com include:sendgrid.net include:stspg-cus…
DNS hosting
SaaS tools (verified in DNS)
  • Atlassian TXT atlassian-domain-verification=UY/0TSrRjscHkE1fc4j/5rI7zB9RazHmBuHPYh4…
  • Google Search Console TXT google-site-verification=kipBgYyk0TD9mitKVzC3tMZxEM7bKlS1i-9wF4K_WMU
  • Notion TXT notion-domain-verification=lo1quFPhllHDUZd4Amy1wgpX2kwIyMGy9ToRU20w7aA
  • Slack TXT slack-domain-verification=FPzPtYFkoNTD4FgWpCfrZqDyt9Ggnfs9ZnZ7YXj7