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.
Visit Castle01 · 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.
- 01
Fingerprint | Identify Every Web Visitor & Mobile Device
The Fingerprint device intelligence platform works across web and mobile applications to identify all visitors with industry-leading accuracy — even if they’re anonymous.
Very close - 02
Fraud Prevention Platform for Digital Business | Sift
Stop payment fraud, account takeover and fake accounts in real time. Sift’s AI agents and global data help 700+ brands approve more trusted customers.
Very close - 03
SEON: AI Fraud Prevention & AML Compliance Platform
SEON's fraud prevention platform unifies real-time detection and AML in one place. Built on 1,100+ first-party signals, with 14 days implementation average.
Very close - 04
SHIELD | Device-First Fraud Intelligence and Detection Platform
SHIELD is a device-first fraud intelligence and detection platform that stops account takeovers, collusion fraud, bot attacks, fake accounts, and abuse across web and mobile apps.
Very close - 05
cybersecurity company
Very close - 06
Incognia | Identify Users vs. Fraudsters. Across devices.
Incognia is the leader in AI-powered cross-device risk intelligence, delivering frictionless growth and security for enterprises across consumer internet and financial services.
Very close - 07
Fake Account & Fraud Detection Platform | Verisoul
Invisibly catch duplicate accounts, AI bots, and fraud. Customize decisions without engineering resources. Verify user identity with AI agents. All in one platform.
Very close - 08
Arkose Labs | See Every AI Agent, Even After It Changes
Personal AI agents like Muse never stop changing. Arkose Titan changes with them and lets you decide what each one can do.
Very close - 09
Kasada | Stopping Automated Threats | Web & API Protection
Kasada transcends bot management with a radical approach to defeat automated threats and online fraud. Web and API protection that lasts.
Very close - 10
Agentic Financial Crime Platform for Fraud Prevention & AML
The top agentic risk platform used by leading banks and merchants worldwide to stop fraud in real-time, prevent AI-driven attacks, automate fraud & AML operations
Very close - 11
Ravelin Technology – Innovative Anti-Fraud & Payments Solutions
Fraud prevention and payment solutions that adapt to your challenges, risk appetite & goals so you can combat the fraud of today and be ready for tomorrow
Very close - 12
BioCatch - Behavioral Intelligence to Prevent Fraud & Build Trust
Seamless and secure online experiences are built with BioCatch behavioral biometrics. We’re more than just fraud prevention. Our solution powers your digital growth.
Very close - 13
Home | Netacea
Enterprise bot protection to stop account takeover, credential stuffing, web scraping, and API abuse. Agentless, AI-driven detection.
Very close - 14
Forter – Fraud Prevention, Payment Optimization and Agentic Commerce
AI powered fraud, abuse, and payment decisions — so your best customers feel less friction, and you leave no revenue behind.
Very close - 15
AI-Native Fraud & Financial Crime Prevention Platform| Feedzai
Stop fraud and financial crime across all channels. Learn about our AI-Native Fraud & Financial Crime prevention platform.
Very close - 16
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.
Very close - 17
hCaptcha: Real-Time Bot Detection & Fraud Prevention
hCaptcha delivers real-time, privacy-first bot detection, AI-agent controls, account defense, and fraud prevention for websites, apps, and APIs. Book a demo.
Very close - 18
Agentic AI Platform for Fraud & AML Operations | Unit21
Unit21 leads agentic AI for financial crime ops. Automate detection and investigation with AI agents doing the work and self-improving with every decision.
Very close - 19
Signifyd: Commerce Runs on Our Decisions
Protect the entire customer journey with the only decision engine built for login, checkout, returns and appeasements, backed by a guarantee.
Very close - 20
Appdome - Agentic Defense for the Mobile Business
Use Appdome to build & maintain 400+ security, anti-fraud, anti-bot defenses in Android & iOS apps. Protect mobile apps, APIs, and identity in ONE.
Very close
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 = 20
- Sites searched
- 9,192
- Vector
- 384-d
- Query
- 28 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
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
- Google Workspace MX aspmx.l.google.com
- Microsoft 365 TXT MS=ms48872418
- Email delivery
- SendGrid TXT v=spf1 include:_spf.google.com include:sendgrid.net include:stspg-cus…
- DNS hosting
- Amazon Route 53 NS ns-1523.awsdns-62.org
- 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
What competitors use
Across the 20 closest sites.
- Google Search Console 20/20
- Google Workspace 18/20
- Google Tag Manager · not on castle.io 16/20
- Microsoft 365 15/20
- HubSpot · not on castle.io 14/20
- Cloudflare · not on castle.io 13/20
- Apple Business · not on castle.io 13/20
- Atlassian 12/20
- Google Fonts · not on castle.io 9/20
- Amazon Route 53 9/20
- Zendesk · not on castle.io 9/20
- jQuery · not on castle.io 8/20
- PHP · not on castle.io 8/20
- OpenAI · not on castle.io 8/20
- WordPress · not on castle.io 7/20
- Cloudflare DNS · not on castle.io 7/20