# Top 10 Castle Alternatives & Competitors (3)3.7 out of 5 Reviewers exploring Castle often also consider these top-rated options in the same software category. E-commerce Fraud Protection Software is used by teams seeking secure, easy to use platforms with features like real-time monitoring, bot mitigation, and intelligence reporting, according to G2 reviews. In most cases, users compare alternatives based on reliability and ease of use. The best overall alternative to Castle is [SEON](https://www.g2.com/products/seon/reviews), rated ~4.6 stars on G2 from 382+ reviewers. It is frequently praised for fraud prevention and customer support. Other well-known alternatives to Castle are: - [Cisco Duo](https://www.g2.com/products/cisco-duo/reviews) – known for security and easy access (G2 star rating ~4.5) - [Signifyd](https://www.g2.com/products/signifyd/reviews) – highly rated for fraud prevention and efficiency (G2 star rating ~4.6) - [Sift](https://www.g2.com/products/sift-s-ai-powered-fraud-decisioning-platform-sift/reviews) – offers fraud prevention and fraud detection (G2 star rating ~4.6) - [Fingerprint](https://www.g2.com/products/fingerprintjs-fingerprint/reviews) – best suited for teams that need setup ease and ease of setup (G2 star rating ~4.7) Browse top options below. Based on G2 review data, Castle is most commonly used in industries like [E-commerce Fraud Protection Software](https://www.g2.com/categories/e-commerce-fraud-protection), [Fraud Detection Software](https://www.g2.com/categories/fraud-detection), [Password Managers](https://www.g2.com/categories/password-managers). Compare user ratings by vertical to find the best fit. ## Best Paid & Free Alternatives to Castle - SEON - Cisco Duo - Signifyd - Sift - Fingerprint - LastPass - 1Password - HAProxy ## Top 10 Alternatives to Castle Recently Reviewed By G2 Community Browse options below. Based on reviewer data, you can see how Castle stacks up to the competition, check reviews from current & previous users in industries like Financial Services and Logistics and Supply Chain, and find the best product for your business. [![G2 Advertising](/assets/my-g2-logo-41632af6f81a240a0a9886638f412b2ac9a29f4001534f8c83be89a58ef9d45d.svg "G2 Advertising")](https://sell.g2.com/case-studies/how-aisdr-uses-g2-ads-to-turn-g2-into-top-5-traffic-source) Sponsored G2 Advertising Get 2x conversion than Google Ads with G2 Advertising! G2 Advertising places your product in premium positions on high-traffic pages and on targeted competitor pages to reach buyers at key comparison moments. [ Learn More ](https://sell.g2.com/case-studies/how-aisdr-uses-g2-ads-to-turn-g2-into-top-5-traffic-source) [ ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/3b0fed5c171cd1fb59c538aaf2b76749/seon.png "Product Avatar Image") ](https://www.g2.com/products/seon/reviews) [ SEON ](https://www.g2.com/products/seon/reviews) By [SEON](https://www.g2.com/sellers/seon-e8fd038f-c191-491e-82f6-93a8719d8209) [ 4.6/5(390) ](https://www.g2.com/products/seon/reviews#reviews) Product Description SEON helps businesses detect fraud, uncover risk, and stay compliant—without slowing down growth. Our single API analyzes digital footprints, devices, and AML data using 900+ real-time, first-party signals. Teams can use machine learning or custom rules, expand globally in weeks, and automate decisioning without black-box limitations or slow onboarding. Categories in common with Castle: [ Fraud Detection ](/categories/fraud-detection)[ E-commerce Fraud Protection ](/categories/e-commerce-fraud-protection) [ ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/e53c653801b737650057c3a3d6d19473/cisco-duo.png "Product Avatar Image") ](https://www.g2.com/products/cisco-duo/reviews) [ Cisco Duo ](https://www.g2.com/products/cisco-duo/reviews) By [Cisco](https://www.g2.com/sellers/cisco) [ 4.5/5(520) ](https://www.g2.com/products/cisco-duo/reviews#reviews) Product Description Duo is a cloud-based access security platform built to protect access to any application, from any device. Duo’s passwordless authentication, single sign-on (SSO) and user-friendly multi-factor authentication make secure logins easy for users, reducing friction to their workflow. Categories in common with Castle: [ Risk-Based Authentication (RBA) ](/categories/risk-based-authentication-rba) [ ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/f5a01f870bff33ab49cf348af47cf1a4/signifyd.png "Product Avatar Image") ](https://www.g2.com/products/signifyd/reviews) [ Signifyd ](https://www.g2.com/products/signifyd/reviews) By [Signifyd](https://www.g2.com/sellers/signifyd) [ 4.6/5(352) ](https://www.g2.com/products/signifyd/reviews#reviews) Product Description With identity and intent intelligence from the world’s largest network of online retailers, Signifyd’s Commerce Protection Platform instantly recognizes the ‘who’ behind every transaction. Every approved order is backed by a 100 percent financial guarantee against fraud and abuse, so merchants can automate payments at scale, streamline customer experiences and grow fearlessly. Categories in common with Castle: [ Fraud Detection ](/categories/fraud-detection)[ E-commerce Fraud Protection ](/categories/e-commerce-fraud-protection) [![G2 Advertising](/assets/my-g2-logo-41632af6f81a240a0a9886638f412b2ac9a29f4001534f8c83be89a58ef9d45d.svg "G2 Advertising")](https://sell.g2.com/case-studies/how-aisdr-uses-g2-ads-to-turn-g2-into-top-5-traffic-source) Sponsored G2 Advertising Get 2x conversion than Google Ads with G2 Advertising! G2 Advertising places your product in premium positions on high-traffic pages and on targeted competitor pages to reach buyers at key comparison moments. [ Learn More ](https://sell.g2.com/case-studies/how-aisdr-uses-g2-ads-to-turn-g2-into-top-5-traffic-source) [ ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/68ff063a23a32920c9f0e37309c6ea23/sift-s-ai-powered-fraud-decisioning-platform-sift.jpg "Product Avatar Image") ](https://www.g2.com/products/sift-s-ai-powered-fraud-decisioning-platform-sift/reviews) [ Sift ](https://www.g2.com/products/sift-s-ai-powered-fraud-decisioning-platform-sift/reviews) By [Sift's Fraud Prevention Platform](https://www.g2.com/sellers/sift-s-fraud-prevention-platform) [ 4.6/5(615) ](https://www.g2.com/products/sift-s-ai-powered-fraud-decisioning-platform-sift/reviews#reviews) Product Description Sift is the leading fraud prevention platform securing digital trust for 700+ global brands. Categories in common with Castle: [ Fraud Detection ](/categories/fraud-detection)[ Risk-Based Authentication (RBA) ](/categories/risk-based-authentication-rba)[ E-commerce Fraud Protection ](/categories/e-commerce-fraud-protection) [ ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/6826a3c7ee650c35912cdd5da62ee031/fingerprintjs-fingerprint.png "Product Avatar Image") ](https://www.g2.com/products/fingerprintjs-fingerprint/reviews) [ Fingerprint ](https://www.g2.com/products/fingerprintjs-fingerprint/reviews) By [Fingerprint](https://www.g2.com/sellers/fingerprint-65c239b0-6031-43c8-9a91-e8c2a0e913fd) [ 4.7/5(435) ](https://www.g2.com/products/fingerprintjs-fingerprint/reviews#reviews) Product Description As opposed to top-down, enterprise-focused fraud prevention platforms, FingerprintJS prevents digital fraud by uniquely and accurately identifying users, and empowering technical teams to use that data in a way that works for their applications. Categories in common with Castle: [ Bot Detection and Mitigation ](/categories/bot-detection-and-mitigation)[ Fraud Detection ](/categories/fraud-detection)[ E-commerce Fraud Protection ](/categories/e-commerce-fraud-protection) [ ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/393046867014b0e8a5bef9babac07fc7/lastpass.png "Product Avatar Image") ](https://www.g2.com/products/lastpass/reviews) [ LastPass ](https://www.g2.com/products/lastpass/reviews) By [LastPass](https://www.g2.com/sellers/lastpass) [ 4.5/5(2,078) ](https://www.g2.com/products/lastpass/reviews#reviews) Product Description LastPass business solutions help teams & businesses take control of their identity management with password management, single sign-on (SSO), and adaptive multifactor authentication (MFA). Categories in common with Castle: [ Risk-Based Authentication (RBA) ](/categories/risk-based-authentication-rba) [ ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/0ef656e3330e2a5b8e59939185859257/1password.png "Product Avatar Image") ](https://www.g2.com/products/1password/reviews) [ 1Password ](https://www.g2.com/products/1password/reviews) By [1Password](https://www.g2.com/sellers/1password) [ 4.6/5(1,810) ](https://www.g2.com/products/1password/reviews#reviews) Product Description 1Password remembers your passwords for you — and helps you make them stronger. All your secrets are secure and always available, safe behind the one password that only you know. Categories in common with Castle: [ Risk-Based Authentication (RBA) ](/categories/risk-based-authentication-rba) [ ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/dec4a4476a52acf5880169de1e5de0d8/haproxy.png "Product Avatar Image") ](https://www.g2.com/products/haproxy/reviews) [ HAProxy ](https://www.g2.com/products/haproxy/reviews) By [HAProxy](https://www.g2.com/sellers/haproxy) [ 4.7/5(912) ](https://www.g2.com/products/haproxy/reviews#reviews) Product Description HAProxy is an open-source software load balancer and reverse proxy for TCP, QUIC, and HTTP-based applications. It provides high availability, load balancing, and best-in-class SSL processing. HAProxy One is an application delivery and security platform that combines the HAProxy core with enterprise-grade security layers, management and orchestration, cloud-native integration, and more. Platform components: HAProxy Enterprise: a flexible data plane layer for TCP, UDP, QUIC, and HTTP-based applications that provides high-performance load balancing, high availability, an API/AI gateway, container networking, SSL processing, DDoS protection, bot detection and mitigation, global rate limiting, and a web application firewall (WAF). HAProxy Fusion: a scalable control plane that provides full-lifecycle management, observability, and automation of multi-cluster, multi-cloud, and multi-team HAProxy Enterprise deployments, with infrastructure integration for AWS, Kubernetes, Consul, and Prometheus. HAProxy Edge: a globally distributed application delivery network that provides fully managed application delivery and security services, a secure partition between external traffic and origin networks, and threat intelligence enhanced by machine learning that powers the security layers in HAProxy Fusion and HAProxy Enterprise. Learn more at HAProxy.com. Categories in common with Castle: [ Bot Detection and Mitigation ](/categories/bot-detection-and-mitigation) [ ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/b2231a414cb9f3f7c194f65af32b723e/cloudflare-application-security-and-performance.png "Product Avatar Image") ](https://www.g2.com/products/cloudflare-application-security-and-performance/reviews) [ Cloudflare Application Security and Performance ](https://www.g2.com/products/cloudflare-application-security-and-performance/reviews) By [Cloudflare, Inc.](https://www.g2.com/sellers/cloudflare-inc) [ 4.5/5(685) ](https://www.g2.com/products/cloudflare-application-security-and-performance/reviews#reviews) Product Description Cloudflare Application Security and Performance solutions provide performance, reliability, and security for all of your web applications and APIs, wherever they are hosted and wherever your users are. Categories in common with Castle: [ Bot Detection and Mitigation ](/categories/bot-detection-and-mitigation) [ ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/2bc8307e6f552c01d67f38c5df358ca7/harness-platform.jpg "Product Avatar Image") ](https://www.g2.com/products/harness-platform/reviews) [ Harness Platform ](https://www.g2.com/products/harness-platform/reviews) By [Harness](https://www.g2.com/sellers/harness-25016f40-e80f-4417-bea8-39412055d17a) [ 4.6/5(312) ](https://www.g2.com/products/harness-platform/reviews#reviews) Product Description Harness is the first Continuous Delivery-as-a-Service platform that uses Machine Learning to simplify the entire process of delivering code from artifact into production – quickly, safely, securely, and repeatably. Categories in common with Castle: [ Bot Detection and Mitigation ](/categories/bot-detection-and-mitigation) ## Castle Alternatives FAQs Generated using AI ### How does Castle compare to SEON? According to G2, [Castle](https://www.g2.com/products/castle/reviews) has an average rating of 3.7/5 from 3 reviews, whereas [SEON](https://www.g2.com/products/seon/reviews) holds a significantly higher average rating of 4.6/5 based on 381 reviews. SEON leads Castle across multiple reviewer-rated dimensions with scores of 9.1 in Meeting Requirements and Usability, 9.2 in Ease of Admin, 9.3 in Support, and 9.4 in Ease of Doing Business, surpassing Castle by notable margins. User feedback highlights SEON's ease of use with 25 mentions, strong fraud prevention (24 mentions), intuitive user interface (19 mentions), and excellent customer support (17 mentions). In contrast, Castle's pros include protection, fraud scoring, and bot detection, but users report issues such as inaccuracy, communication challenges, false positives, and ineffective blocking. SEON's platform is praised for its customizable rules, detailed fraud detection capabilities, and real-time monitoring, while Castle's limited review volume and lower satisfaction scores reflect less favorable user experiences. Overall, SEON demonstrates superior user satisfaction, feature richness, and operational efficiency compared to Castle. ### What are the best alternatives to Castle? The best alternatives to Castle are SEON (4.6/5 with 381 reviews), Signifyd (4.6/5 with 352 reviews), Sift (4.6/5 with 610 reviews), and Cisco Duo (4.5/5 with 516 reviews), all rated significantly higher than Castle's 3.7/5 from 3 reviews. ### What features do alternatives offer that Castle does not? Castle lacks advanced customization and detailed data enrichment features that alternatives like SEON provide, including over 900 real-time, first-party data signals and flexible rule engines. ### Which E-commerce Fraud Protection tools do reviewers recommend instead of Castle? Reviewers recommend SEON for its extensive data coverage, customizable rules, and excellent customer support, making it ideal for fast-moving fraud teams. Signifyd is favored for its 100% financial chargeback guarantee and automation that reduces manual reviews. Sift is praised for its AI-powered real-time fraud detection, user-friendly interface, and comprehensive analytics. Cisco Duo is recommended for secure, user-friendly multi-factor authentication with seamless integrations and strong device visibility, enhancing access security beyond fraud protection. ### Why do users choose SEON over Castle? Users choose [SEON](https://www.g2.com/products/seon/reviews) over Castle primarily due to its higher ease of use and extensive customization capabilities, as reflected in 25 mentions of ease of use and 13 mentions of rule customization. SEON's intuitive user interface and seamless integration with existing systems simplify fraud detection workflows, supported by 17 mentions of excellent customer support that ensures rapid issue resolution. The platform's comprehensive fraud prevention features, including real-time monitoring and detailed data enrichment, enable users to reduce manual reviews and improve detection accuracy, with 24 mentions praising its fraud prevention effectiveness. SEON's flexibility in tailoring rules to specific business needs and its strong support infrastructure contribute to a smoother implementation and administration experience, as evidenced by its 9.2 Ease of Admin and 9.3 Support scores. These factors collectively drive user preference for SEON, delivering measurable improvements in operational efficiency and fraud management over Castle. ### Explore Articles [ Best platforms for integrating knowledge bases with chatbots ](https://www.g2.com/discussions/best-platforms-for-integrating-knowledge-bases-with-chatbots) [ Which estimating software offers real-time cost updates? ](https://www.g2.com/discussions/which-estimating-software-gives-me-real-time-cost-updates) [ How does JumpCloud support SaaS security and user access control? ](https://www.g2.com/discussions/how-does-jumpcloud-support-saas-security-and-user-access-control) [ What are the best app monetization platforms for publishers optimizing fill rates without dedicated ad operations staff? ](https://www.g2.com/discussions/what-are-the-best-app-monetization-platforms-for-publishers-optimizing-fill-rates-without-dedicated-ad-operations-staff) [ Best EOR provider for a digital services company ](https://www.g2.com/discussions/best-eor-provider-for-a-digital-services-company) [ Which ERM platforms are rated highest for mid-market organizations looking for a balance between cost and capability? ](https://www.g2.com/discussions/which-erm-platforms-are-rated-highest-for-mid-market-organizations-looking-for-a-balance-between-cost-and-capability) ### Spotlight Categories [ Customer Communications Management Software ](https://www.g2.com/categories/customer-communications-management) [ Digital Experience Platforms (DXP) ](https://www.g2.com/categories/digital-experience-platforms-dxp) [ Employee Intranet Software ](https://www.g2.com/categories/employee-intranet)