Best Web Application Firewalls (WAF)

Compare the Top Web Application Firewalls (WAF) as of October 2025

What are Web Application Firewalls (WAF)?

Web Application Firewalls (WAFs) are security solutions that protect web applications by filtering and monitoring HTTP traffic between the application and the internet. They detect and block threats such as SQL injections, cross-site scripting (XSS), and other common attacks targeting application vulnerabilities. WAFs analyze incoming requests in real time, applying customizable security rules to distinguish between legitimate and potentially malicious traffic. Many WAFs are cloud-based, enabling flexible and scalable protection without impacting application performance. By acting as a shield between web applications and attackers, WAFs help ensure data security, regulatory compliance, and uninterrupted user access. Compare and read user reviews of the best Web Application Firewalls (WAF) currently available using the table below. This list is updated regularly.

  • 1
    Fortinet FortiWeb Web Application Firewall
    Unprotected web applications and APIs are the easiest point of entry for hackers and vulnerable to a number of attack types. FortiWeb's AI-enhanced and multi-layered approach protects your web apps from the OWASP Top 10 and more. FortiWeb ML customizes the protection of each application, providing robust protection without requiring the time-consuming manual tuning required by other solutions. With ML, FortiWeb identifies anomalous behavior and, more importantly, distinguishes between malicious and benign anomalies. The solution also features robust bot mitigation capabilities, allowing benign bots to connect (e.g. search engines) while blocking malicious bot activity. FortiWeb also features API discovery and security, as well as threat analytics to identify meaningful security incidents. FortiWeb is available as an appliance, VM, and fully featured WAF-as-a-Service - which is available to trial and purchase in most cloud marketplaces.
    Starting Price: $30/mo for 1 app on SaaS
  • 2
    AppTrana

    AppTrana

    Indusface

    Indusface’s AppTrana is a fully managed web application firewall that ensures risk-based protection with its DDoS, API risk, and Bot mitigation services while assuring web acceleration with secure CDN. Combining automated scanning with manual pen-testing, it detects application vulnerabilities. All of this with 24x7 expert support to meet zero false-positive guarantees. Indusface is the only vendor to be named Customers’ Choice for WAAP in all the 7 segments of the Gartner VoC 2022 Report.
    Starting Price: $99/month
  • 3
    Signal Sciences

    Signal Sciences

    Signal Sciences

    The leading hybrid and multi-cloud platform that provides next-gen WAF, API Security, RASP, Advanced Rate Limiting, Bot Protection, and DDoS purpose built to eliminate the challenges of legacy WAF. Legacy WAFs weren’t designed for today’s web apps that are distributed across cloud, on-premise or hybrid environments. Our next-gen web application firewall (NGWAF) and runtime application self protection (RASP) increase security and maintain reliability without sacrificing velocity, all at the lowest total cost of ownership (TCO).
  • 4
    Traceable

    Traceable

    Traceable

    Meet the Industry’s Context-Aware API Security Platform Traceable identifies all of your APIs, and evaluates your API risk posture, stops API attacks that lead to incidents such as data exfiltration, and provides analytics for threat hunting and forensic research. With our solution, you can confidently discover, manage and secure all of your APIs, quickly deploy, and easily scale to meet the ongoing needs of your organization. If you’re planning on improving the data security posture in your APIs, Traceable would love the opportunity to discuss how we could help and share some of our lessons learned from working with enterprise customers like Canon, Informatica, Outreach, and many others.
    Starting Price: $0
  • 5
    Barracuda WAF-as-a-Service
    Configuring traditional web application firewalls can take days of effort. But Barracuda WAF-as-a-Service—a full-featured, cloud-delivered application security service—breaks the mold. Deploy it, configure it, and put it into full production—protecting all your apps from all the threats—in just minutes.
  • 6
    A10 Thunder ADC

    A10 Thunder ADC

    A10 Networks

    High-performance advanced load balancing solution that enables your applications to be highly available, accelerated, and secure. Ensure efficient and reliable application delivery across multiple datacenters and cloud. Minimize latency and downtime, and enhance end-user experience. Increase application security with advanced SSL/TLS offload, single sign-on (SSO), DDoS protection and Web Application Firewall (WAF) capabilities. Complete full-proxy Layer 4 load balancer and Layer 7 load balancer with flexible aFleX® scripting and customizable server health checks.
  • 7
    Reblaze

    Reblaze

    Reblaze

    Reblaze is the leading provider of cloud-native web application and API protection, providing a fully managed security platform. Reblaze’s all-in-one solution supports flexible deployment options (cloud, multi-cloud, hybrid, data center and service mesh), deployed in minutes and includes state-of-the-art Bot Management, API Security, next-gen WAF, DDoS protection, advanced rate limiting, session profiling, and more. Unprecedented real time traffic visibility as well as highly granular policies enables full control of your web traffic. Machine learning provides accurate, adaptive threat detection, while dedicated VPC deployment ensures maximum privacy, performance and protection while minimizing overhead costs. Reblaze customers include Fortune 500 companies and innovative organizations across the globe.
  • 8
    K2 Security Platform

    K2 Security Platform

    K2 Cyber Security

    Complete Protection for Applications and Container Workloads. Real-time Zero Day Attack Prevention. The K2 Security Platform is highly effective at detecting increasingly sophisticated attacks targeting applications that often go undetected by network and end point security solutions such as web application firewall (WAF) and endpoint detection and response (EDR). K2’s easy to deploy non-invasive agent installs in minutes. Using a deterministic technique of optimized control flow integrity (OCFI) the K2 Platform automatically creates a DNA map of each application at runtime which are used to determine the application is executing correctly. This results in extremely accurate attack detection that eliminates almost all false alerts. K2’s Platform can be deployed in cloud, on premise or in hybrid environments and protects web applications, container workloads and Kubernetes. OWASP Top 10 and other sophisticated attack type coverage.
  • 9
    open-appsec

    open-appsec

    open-appsec

    automatic web application & API security using machine learning open-appsec is an open-source initiative that builds on machine learning to provide pre-emptive web app & API threat protection against OWASP-Top-10 and zero-day attacks. It can be deployed as add-on to Kubernetes Ingress, NGINX, Envoy and API Gateways. open-oppsec simplifies maintenance as there is no threat signature upkeep and exception handling, like common in many WAF solutions.
  • 10
    Kona Site Defender

    Kona Site Defender

    Akamai Technologies

    Protect your apps and APIs against the largest and most sophisticated attacks with a web application firewall and DDoS protection at the edge. Kona Site Defender provides application security at the edge — closer to attackers and further from your applications. With 178 billion WAF rule triggers a day, Akamai harnesses unmatched visibility into attacks to deliver curated and highly accurate WAF protections that keep up with the latest threats. Flexible protections help secure your entire application footprint and respond to changing business requirements, including APIs and cloud migration, with dramatically lower management overhead. Kona Site Defender employs a proprietary anomaly detection engine designed to deliver the highest accuracy out of the box. You need application security that can be customized for your unique requirements and the organizations you support.
  • 11
    Ivanti

    Ivanti

    Ivanti

    Ivanti offers integrated IT management solutions designed to automate and secure technology across organizations. Their Unified Endpoint Management platform provides intuitive control from a single console to manage any device from any location. Ivanti’s Enterprise Service Management delivers actionable insights to streamline IT operations and improve employee experiences. The company also provides comprehensive network security and exposure management tools to protect assets and prioritize risks effectively. Trusted by over 34,000 customers worldwide, including Conair and City of Seattle, Ivanti supports secure, flexible work environments. Their solutions enable businesses to boost productivity while maintaining strong security and operational visibility.
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