11 Ways to Pinpoint a User's True Location
Hi 👋 – I'm the founder of Castle, a developer-first fraud prevention platform that helps you automatically collect and
Johan Brissmyr
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9 device fingerprinting solutions for developers in 2025
As the availability of unique IPs and user agents wanes and cookie reliability remains half-baked at best, device fingerprinting has emerged as a serious contender in the battle against online fraud and abuse.
7 Proxy Piercing Techniques: What Works in 2023?
Introduction With the rise of online tracking, proxy and VPN services have become a popular way to protect people'
Product
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Swiftly identify fraud rings with instant link analysis
Castle is a real-time rules engine designed to manage fraud and risk across all touchpoints, including onboarding, login, payment,
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A Layered Approach to Bot Detection and ATO Prevention
Learn about two layers in user and account defense, and how deploying Castle gives you a single solution that improves security and reduces user friction.
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Using Castle with OIDC Providers
This post covers strategies for adding Castle's layer of bot detection and ATO prevention to your OIDC authentication flow, getting the best of both worlds. This is relevant for apps using an external identity provider, like Okta, Auth0, Amazon Cognito, Google, or Facebook.
Industry
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Bot or Not: Can you spot the automated mouse movements?
In this post, we'll take a look at three types of bot-generated mouse interactions and we'll discuss how these can be automatically detected. See if you can pick out the bot mouse movements from the human ones!
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Living On The Edge: Less Servers. Less Code. More Security.
We're excited to work with Cloudflare on a codeless way for companies to protect their online accounts and make it easier to implement strong security.
Industry
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The Account Takeover Lifecycle: 4 Stages You Need to Know
You need to know what’s going on inside and outside your applications to protect against Account Takeover. Here are the 4 stages of ATOs you need to know.
Company
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We’ve raised $9.2 million led by Index Ventures
In 2015, Sebastian and I created Castle with a simple vision. We saw that it was increasingly difficult for companies
Industry
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Stop Calling It Account Takeover “Fraud”
To actually prevent Account Takeovers you have to threat ATOs as a security threat not fraud.
Industry
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Perimeter-based Security Doesn’t Stop Account Takeovers — It Postpones Them
DDoS prevention, bot prevention, and WAFs were never built for protecting users from ATOs. Its time to combine that with user behavior analytics.