Castle Alternatives & Competitors
12 companies similar to Castle — Defend against bots, fraud, and abuse.
ErikLabs
Quality Assurance - Web & App Testing
Istanbul, Turkey
Equixly
AI-Powered Hacker to Secure your API
Verona, Italy
Build38
>The Next Generation Mobile App Security Platform_
Germany
Razorpay
The only payments solution in India that allows businesses to accept, process and disburse...
India
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AU10TIX
Global Provider of Identity Verification and Identity Management Solutions
Amsterdam, The Netherland...
Astra
The all-in-one platform for instant payments.
Unified (TS S23)
One API, 350+ Integrations across 21 B2B verticals — The #1 real-time unified API+MCP for...
Toronto, Canada
alltius.ai
Artificial Intelligence that drives real outcomes!
San Francisco, United Sta...
Onfido
Simplifying identity for everyone.
London, United Kingdom
Nebius
Built on Yandex's non-Russia operations. Scalable GPU infrastructure powering enterprise A...
Amsterdam, The Netherland...
Radom
Crypto Payments for Business
London, United Kingdom
Fluency
Supercharging finance and cybersecurity innovation
London, United Kingdom
About Castle
Defend against bots, fraud, and abuse.
fraud defense at the edge, in-app fraud detection with SDK, real-time risk analysis and management, custom security flows and rules engine, API integration for threat insights
enterprises, businesses handling online transactions, platforms vulnerable to bot attacks, companies needing real-time fraud detection, developers integrating security features
Bot Protection, Fraud Prevention, Account Takeover Protection, Transaction Fraud Detection, Spam Blocking, Device Fingerprinting, User Behavior Analysis, Cybersecurity Solutions, User Account Security, API Integration, E-commerce Security, Mobile App Security, Online Business Protection, Real-time Threat Detection, Customer-facing Application Protection
B2B, SaaS, API
Pay As You Go, Usage Based, Subscription
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Compiled from the BounceWatch company index. We last looked at Castle on 27 Mar 2026. The 12 companies listed here were last checked between 29 May 2025 and 18 Jun 2026. Where a field is blank here, it means we have not recorded it — not that the answer is zero. How we source and date this.