Best Firewall Software

Compare the Top Firewall Software as of June 2025

What is Firewall Software?

Firewall software is a security tool that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Acting as a barrier between a trusted internal network and untrusted external networks, firewalls help prevent unauthorized access and protect against cyber threats. They work by analyzing data packets and determining whether they should be allowed through based on set policies, blocking potentially harmful traffic. Modern firewalls often incorporate advanced features like intrusion prevention, application filtering, and deep packet inspection to strengthen security further. By providing this critical layer of protection, firewall software safeguards sensitive data and ensures the integrity of networked systems. Compare and read user reviews of the best Firewall software currently available using the table below. This list is updated regularly.

  • 1
    Fastly

    Fastly

    Fastly

    Empower your developers, connect with your customers, and grow your business with today’s leading edge cloud platform. Deliver the best online experiences possible with our edge cloud platform, built to strengthen your current teams and technology. We move data and applications closer to your users — at the edge of the network — to help your websites and apps perform faster, safer, and at global scale. Fastly's highly programmable CDN gives you the freedom to customize delivery right at the edge. Delight your users with the content they want at their fingertips. Our powerful POPs, driven by solid-state drives (SSDs) and hosted in well-connected locations around the world, help us keep more content in cache longer for fewer trips to the origin. Instant Purge and batch purging with surrogate keys let you cache and invalidate highly dynamic content with a mean purge time of 150 milliseconds*. Serve headlines, inventory, or weather forecasts that are always up to date.
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  • 2
    Heimdal Endpoint Detection and Response (EDR)
    Heimdal® Endpoint Detection and Response is our proprietary multi-solution service providing unique prevention, threat-hunting, and remediation capabilities. It combines some of the most advanced threat-hunting technologies: - Next-Gen Antivirus - Privileged Access Management - Application Control - Ransomware Encryption Protection - Patch & Asset Management - Email Security - Remote Desktop - Threat Prevention ( DNS based ) - Threat Hunting & Action Center With 9 modules working together seamlessly under one convenient roof, all within one agent and one platform, Heimdal Endpoint Detection and Response grants you access to all the essential cybersecurity layers your business needs to protect itself against both known and unknown online and insider threats. Our state-of-the-art product empowers you to quickly and effortlessly respond to sophisticated malware with stunning accuracy, protecting your digital assets and your reputation in the process as well.
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    Starting Price: $0/month
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  • 3
    Kamatera

    Kamatera

    Kamatera

    Kamatera’s cloud firewall solutions provide protection from attacks on cloud servers and private cloud networks. Our cloud security experts set up cloud firewalls and monitor your server’s activity in real time. We help shield your data by analyzing and filtering data packets to identify source, destination, and content, exclusively authorizing the entry of certified and approved data packets to your servers. Our highly secure cloud firewalls are an all-in-one solution, as they are compatible with all virtual appliances to deliver comprehensive protection. Kamatera’s cloud firewalls can also function as a hardware VPN server and act as a checkpoint for all network traffic. This eliminates the need for additional VPN services. Due to versatility and infinite scalability options, our cybersecurity services are perfect for individuals, SMBs, and enterprise-level companies. One single cloud firewall can protect your entire cloud infrastructure.
    Starting Price: $4 per month
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  • 4
    Cloudflare

    Cloudflare

    Cloudflare

    Cloudflare is the foundation for your infrastructure, applications, and teams. Cloudflare secures and ensures the reliability of your external-facing resources such as websites, APIs, and applications. It protects your internal resources such as behind-the-firewall applications, teams, and devices. And it is your platform for developing globally scalable applications. Your website, APIs, and applications are your key channels for doing business with your customers and suppliers. As more and more shift online, ensuring these resources are secure, performant and reliable is a business imperative. Cloudflare for Infrastructure is a complete solution to enable this for anything connected to the Internet. Behind-the-firewall applications and devices are foundational to the work of your internal teams. The recent surge in remote work is testing the limits of many organizations’ VPN and other hardware solutions.
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    Starting Price: $20 per website
  • 5
    Imunify360

    Imunify360

    CloudLinux, Inc.

    Imunify360 is a security solution for web-hosting servers. Imunify360 goes beyond antivirus and WAF and is a combination of an Intrusion Prevention and Detection system, a Application Specific Web Application Firewall, Real-time Antivirus protection, a Network Firewall, and Patch Management components in one security suite. Imunify360 is a fully-automated solution and it collects all statistics under an intuitive dashboard.
    Starting Price: $12
  • 6
    Zscaler

    Zscaler

    Zscaler

    Zscaler, creator of the Zero Trust Exchange platform, uses the largest security cloud on the planet to make doing business and navigating change a simpler, faster, and more productive experience. The Zscaler Zero Trust Exchange enables fast, secure connections and allows your employees to work from anywhere using the internet as the corporate network. Based on the zero trust principle of least-privileged access, it provides comprehensive security using context-based identity and policy enforcement. The Zero Trust Exchange operates across 150 data centers worldwide, ensuring that the service is close to your users, co-located with the cloud providers and applications they are accessing, such as Microsoft 365 and AWS. It guarantees the shortest path between your users and their destinations, providing comprehensive security and an amazing user experience. Use our free service, Internet Threat Exposure Analysis. It’s fast, safe, and confidential.
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    FortiClient

    FortiClient

    Fortinet

    Multilayered endpoint security with behavior based analysis for prevention against known and unknown threats. Complete real-time visibility of all your global software inventory. Here, there, anywhere. Cloud-delivered FortiClient endpoint protection service designed for small and medium-sized business. Integrated endpoint protection platform that provides automated next-generation threat protection, visibility and control of your software and hardware inventory across the entire security fabric. Identify & remediate vulnerable or compromised hosts across your attack surface. As a key piece of the Fortinet Security Fabric, FortiClient integrates endpoints into the fabric for early detection and prevention of advanced threats. Security events including zero-day malware, botnet detections, and vulnerabilities are reported in real-time.
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    Cisco Meraki
    Network security is hard. Current solutions are complex and tedious to implement. Learn how to simplify security with Cisco Meraki! Trusted by influential brands around the world. With over a million active networks and counting, organizations far and wide count on Meraki to help deliver premium, reliable experiences. All Cisco Meraki devices are centrally and securely managed from the cloud using a single web-based dashboard. Our feature-rich, intuitive architecture enables customers to save time, reduce operating costs, and solve new business problems. The industry standard for easy-to-manage, fast and dependable Wi-Fi. Protect and securely connect what matters most, regardless of location. Uncompromising performance and reliability at the heart of your network. Remote monitoring and identity-based configuration for all your devices.
    Starting Price: $40.00
  • 9
    Avast Small Business Solutions
    Avast Small Business Solutions deliver next-gen endpoint protection for business Windows PCs, Mac, and Windows servers that you can manage anywhere via a web browser. Our robust, easy-to-use security for devices, data, and applications is designed to keep small organizations and their employees safer online. Avast antivirus with multiple layers of security, online privacy, and remote-control features provides powerful cybersecurity controlled via a cloud-based management console. Avast Small Business Solutions are managed via cloud-based management console Avast Business Hub and consist of: * Avast Essential Business Security   * Avast Premium Business Security - combines our next-gen antivirus with VPN and USB control) * Avast Ultimate Business Security - award-winning next-gen antivirus with online privacy tools and patch management automation software
    Starting Price: $39.99/device/year
  • 10
    Linode

    Linode

    Linode

    Simplify your cloud infrastructure with our Linux virtual machines and robust set of tools to develop, deploy, and scale your modern applications faster and easier. Linode believes that in order to accelerate innovation in the cloud, virtual computing must be more accessible, affordable, and simple. Our infrastructure-as-a-service platform is deployed across 11 global markets from our data centers around the world and is supported by our Next Generation Network, advanced APIs, comprehensive services, and vast library of educational resources. Linode products, services, and people enable developers and businesses to build, deploy, and scale applications more easily and cost-effectively in the cloud.
    Starting Price: $5 per month
  • 11
    Fortinet

    Fortinet

    Fortinet

    Fortinet is a global leader in cybersecurity solutions, known for its comprehensive and integrated approach to safeguarding digital networks, devices, and applications. Founded in 2000, Fortinet provides a wide range of products and services, including firewalls, endpoint protection, intrusion prevention systems, and secure access solutions. At the core of its offerings is the Fortinet Security Fabric, a unified platform that seamlessly integrates security tools to deliver visibility, automation, and real-time threat intelligence across the entire network. Trusted by businesses, governments, and service providers worldwide, Fortinet emphasizes innovation, scalability, and performance, ensuring robust defense against evolving cyber threats while supporting digital transformation and business continuity.
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    OPNsense

    OPNsense

    OPNsense

    Simple packet filters are becoming a thing of the past. Even the open-source domain is moving towards Next-Generation Firewalls. And OPNsense is a top player when it comes to intrusion detection, application control, web filtering, and anti-virus. No network is too insignificant to be spared by an attacker. Even home networks, washing machines, and smartwatches are threatened and require a secure environment. Firewalls are a component of the security concept. They protect against known and new threats to computers and networks. A firewall offers the highest level of protection if its functions are known, its operation is simple, and it is ideally positioned in the surrounding infrastructure. OPNsense accepts the challenge and meets these criteria in different ways. This book is the ideal companion for understanding, installing and setting up an OPNsense firewall.
    Starting Price: Free
  • 13
    UltraDNS

    UltraDNS

    Vercara

    UltraDNS is an enterprise grade, cloud-based authoritative DNS service that securely delivers fast and accurate query responses to websites and other vital online assets. Enterprise grade, managed authoritative DNS service that ensures 100% website availability along with built-in security for superior protection. In a connected world, as Internet users expect seamless and secure online experiences, DNS has become more difficult and complex to manage than ever before. The emergence of IoT devices and online threats leave businesses struggling to find the correct DNS strategy for their IT needs. Having the experience and DNS know-it-all in-house is nearly impossible, let alone having the dedicated resources to correctly manage and implement a sound strategy to meet today’s Internet demands. Ensure that your website and other online assets are always available. Backed by our 100% uptime guarantee and industry leading SLAs, UltraDNS offers a global platform.
    Starting Price: $49.00 per month
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    enforza

    enforza

    enforza

    The cost-effective alternative to AWS Network Firewall, Azure Firewall, and cloud-native NAT Gateways. Same features. Less cost. No data processing charges. enforza is a cloud-managed firewall platform that helps you build a unified multi-cloud perimeter with powerful firewall, egress filtering and NAT Gateway capabilities. With easy cloud management at its core, enforza is truly multi-cloud, enabling you to apply consistent security policies across multiple clouds and regions. - Install the agent on *your* linux instance (cloud or on-prem) with one command. - Claim your device on the portal. - Manage your policies.
    Starting Price: $39/month/gateway
  • 15
    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.
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    VyOS

    VyOS

    VyOS Networks

    Democratizing how we access networks through a universal router and open source software. Our vision at VyOS is to dramatically change how we access networks so that we can all build the solutions we always dreamed of, without restrictions, limitations, or prohibitive costs. We fundamentally believe that internet access is as vital to our human development as air, food, water, and healthcare. Built by engineers for engineers, VyOS is an open source software company that democratizes how we access networks so that the many, not the few, benefit from building solutions without limitations and prohibitive fees. We do this as VyOS through our open source software and virtual platforms. Stateful firewalls, zone-based firewall, all types of source and destination NAT (one to one, one to many, many to many). The entire codebase and build toolchain are available to everyone for auditing, building customized images and contributing.
    Starting Price: $1000
  • 17
    VersaONE

    VersaONE

    Versa Networks

    The AI-powered platform for unified security and networking. Enhance the speed of detection and remediation with AI-powered threat and data protection that minimizes human errors. Improve user and app experience, and improve performance and reliability with an AI-powered network. Lower your TCO by simplifying your infrastructure with a converged platform that reduces point product sprawl, fragmented operations, and complex lifecycle management. VersaONE provides seamless connectivity and unified security for all users, devices, offices, branches, and edge locations. It delivers secure access to all your workloads, applications, and clouds from a single platform, ensuring that data and resources are accessible and secure across any network whether it be WAN, LAN, wireless, cellular or satellite. This unified platform approach streamlines network management, reduces complexity, and enhances security, meeting the demands of modern IT environments.
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    CloudScale365

    CloudScale365

    CloudScale365

    No matter what size or type of cloud you need, CloudScale365 offers a variety of options to fit your business. Whether a public, hybrid, virtual private or private cloud, everyone agrees that the key benefits of cloud computing include scalability, instant provisioning, virtualized resources, and ability to expand the server base quickly. Our expert team will work with you to architect the perfect cost effective custom solution, so your data is easily available yet solidly protected. Easily overcome the major challenges of configuring, deploying, and managing your public cloud environment with our managed public cloud services. We’ve partnered with Microsoft to help you focus on your core business rather than worrying about your IT systems. Adhere to compliance requirements without the cost of extra hardware with our virtual private cloud hosting. You can add storage, networking or computer resources as you need them or reconfigure your existing resources how and when you want to.
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