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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

5 of the 60 sites closest to Castle match.

  1. 01
    Centinel Analytica centinel-analytica.com Top 1K English No trackers

    Centinel Analytica | Bot and AI crawler protection

    Centinel Analytica detects real-browser automation, residential-proxy scrapers and spoofed AI crawlers, verifies trusted bots and applies your access policy.

    Compare Centinel Analytica with Castle →
  2. 02
    oopspam.com English No trackers

    oopspam: Automate your Spam and Fraud Detection

    Prevent spam and fraud before they impact your business. High accuracy. Zero data compromise.

    Compare oopspam.com with Castle →
  3. 03
    Shodan shodan.io Top 10K English No trackers

    Shodan Search Engine

    Search Engine for the Internet of Things

    Compare Shodan with Castle →
  4. 04
    Stripe stripe.com Top 1K English No trackers

    Stripe | Financial Infrastructure to Grow Your Revenue

    Stripe is a financial services platform that helps all types of businesses accept payments, build flexible billing models and manage money movement.

    Compare Stripe with Castle →
  5. 05
    Gologin gologin.com English No trackers

    Browser for Managing Multiple Accounts | Gologin

    Every account in an isolated browser profile with its own fingerprint, cookies and location. Manage all your accounts from one device. Free 7-day trial.

    Compare Gologin 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, the competitor map and search numbers · 11 technologies
Neighbours
k = 60
Sites searched
9,217
Vector
384-d
Query
67 ms

Competitor map

Each alternative by how close its vector is to Castle’s (x) and how much traffic it gets, how much of the stack it shares, or where it sits in the embedding space itself (y). Hover for the numbers, click to jump to it in the list.

similarity × popularity

GologinStripeShodanoopspam.comCentinel Analytica

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