Best Firewall Software: Top 6 Firewall Picks

If you are not sure whether you need a secure firewall for personal or business use, this review is for you. As you may notice, the Internet is enormously fast when it comes to developing technologies. It is easy to miss something new! With the development of the Internet, the need for a firewall as an addition to a robust antivirus emerged. In the review, we offer you the best firewall software that is included in the suites of Avast, Norton, Bitdefender, Webroot, and Panda brands. But first, let us learn what firewall is and which features it offers.

Do You Even Need a Third-Party Firewall in 2026?

This is the honest first question, and for most Windows users in May 2026 the answer is: probably not. Windows Defender Firewall ships with Windows 11, is enabled by default, filters both inbound and outbound traffic when configured, and provides meaningful protection against network-borne threats. Most consumer-grade third-party firewalls in 2026 are lightweight frontends that expose Windows Firewall's existing rule engine in a friendlier UI rather than replacing it.

Where a third-party firewall still meaningfully adds value:

• Outbound traffic visibility per-application. Windows Defender Firewall can do this but its UI does not surface it in a consumer-friendly way. Tools like GlassWire, ZoneAlarm, and Little Snitch (macOS) make outbound per-app traffic auditable.
• HIPS (host intrusion prevention) behavior. Comodo CIS is the main consumer option. Sandboxes unknown executables, blocks suspicious behavior patterns beyond pure port filtering.
• Network monitoring as a first-class feature. GlassWire specifically is a monitoring product with firewall features, rather than a firewall with monitoring bolted on.
• Integrated suite convenience. Norton Smart Firewall, Bitdefender's firewall, and Kaspersky's firewall come bundled with their antivirus suites and coordinate with the rest of the suite.

If you are a consumer running Windows 11 with a modern router (itself running NAT and a stateful firewall), your realistic third-party firewall candidates are:

1. ZoneAlarm Free Firewall — free, Check Point heritage
2. GlassWire — best monitoring UX, $35.88/yr Basic
3. TinyWall — free, lightweight Windows Firewall frontend
4. Comodo Internet Security (CIS) — free, HIPS + sandbox
5. Norton Smart Firewall — bundled with Norton 360, not sold separately
6. Windows Defender Firewall — free, built-in, often the correct answer

#1 — ZoneAlarm Free Firewall: Long-Standing Free Option

Price: ZoneAlarm Free Firewall $0; ZoneAlarm Pro Firewall $14.95/year; ZoneAlarm Extreme Security $44.95/year.

Heritage. ZoneAlarm is one of the oldest consumer firewall brands (original release 1999). It is now owned by Check Point Software Technologies, the enterprise firewall giant. The consumer product draws on Check Point's threat intelligence feeds. Free tier has been available continuously since launch.

Features (Free tier). Inbound and outbound application-level control; Stealth Mode (hide open ports from scans); anti-phishing for browsers; basic identity protection. Pro tier adds advanced behavioral rules and 24/7 tech support.

What users praise on Reddit. On r/antivirus and r/firewalls, ZoneAlarm is the most-cited free consumer firewall with actual brand trust behind it — the Check Point parentage is taken seriously. The Stealth Mode behavior and the application-level outbound prompts are the main functional draws.

What users criticize. The installer has historically bundled other Check Point products; read the installer checkboxes. The UI is dated — visually it feels like a 2015 product. Auto-update prompts can be aggressive.

Who should pick ZoneAlarm: users who want the longest-running free consumer firewall with enterprise-grade backing. Anyone who specifically wants outbound per-app prompts on top of Windows Firewall.

#2 — GlassWire: Best Network Monitoring UX

Price: GlassWire Free (single PC, 30 days graph history); Basic $2.99/month ($35.88/year); Pro $4.99/month ($59.88/year); Elite $9.99/month ($119.88/year).

What it is. GlassWire is fundamentally a network-monitoring application with a firewall layer on top — the opposite design philosophy from traditional firewalls that bolt on monitoring. The signature feature is the real-time traffic graph showing exactly which applications and remote hosts are using your network bandwidth, with historical data going back 30 days (Free), 6 months (Basic), or 1 year (Pro).

Features. Per-application bandwidth usage; connection history to remote IPs and their geolocation; ask-to-connect mode (firewall prompts first-time connection by any app); new network behavior alerts; device-on-LAN alerts; GeoIP-based anomaly detection.

What users praise on r/firewalls. GlassWire is widely cited as the best visualization tool for home network traffic — the graph UI makes it easy to spot background applications phoning home unexpectedly. Multiple r/pihole users run GlassWire alongside Pi-hole to correlate DNS blocks with per-app bandwidth.

What users criticize. The Free tier has meaningful limits (single PC, 30 days history); the Basic tier at $35.88/year is not cheap for a monitoring tool; the firewall engine underneath is still Windows Firewall, so the protective value over plain Windows Firewall is the UI, not the filtering engine.

Who should pick GlassWire: users who want visibility into what their computer is doing on the network. Technically-curious home users who want to audit background apps. Not the pick if you want strong behavioral HIPS.

#3 — TinyWall: Best Lightweight Windows Firewall Frontend

Price: Free and donation-supported. Open source.

What it is. TinyWall is a free, lightweight frontend for the Windows Defender Firewall. It does not replace Windows Firewall — it configures it through a usability layer. The default mode is a zero-prompt whitelist approach: nothing gets out unless you explicitly allow it.

Features. Application-whitelist-based filtering; port and domain allow rules; autolearn mode (temporarily learns which apps you use to build a whitelist); password-protected settings; hosts-file protection; tamper protection. Memory footprint is under 2 MB — genuinely tiny.

What users praise on r/firewalls. The zero-popup philosophy is the main draw — TinyWall does not interrupt you every time a new app tries to connect. You set the whitelist once, and traffic outside it simply blocks silently. Open source means the code is auditable. The developer has maintained steady releases for over a decade.

What users criticize. The UI is unpolished — functional but Windows-XP-era visually. No cross-platform; Windows only. Learning-mode false positives can leave things enabled that you would rather block.

Who should pick TinyWall: users who want the strongest outbound control on Windows, do not mind a utilitarian UI, and prefer not to run a third-party firewall engine. Developers and power users.

#4 — Comodo Internet Security (CIS): Free HIPS + Sandbox

Price: Comodo Internet Security Free $0 (bundled AV + firewall + HIPS + Auto-Sandbox); Comodo Advanced $29.99/year (adds secure browser, Guarantee).

What it is. Comodo CIS is a full security suite whose firewall component is legitimately one of the most aggressive consumer firewalls on the market. The behavioral HIPS (host intrusion prevention system) and Auto-Sandbox features go well beyond port/application filtering — unknown executables run in an isolated sandbox by default until proven safe.

Features. Bidirectional application firewall; HIPS with configurable rule sets; Auto-Sandbox for unknown executables; Viruscope behavioral monitoring; Secure DNS option; Secure Shopping virtual-session browser.

What users say on Reddit. Comodo has a bimodal reputation. Power users on r/antivirus and older firewall-enthusiast communities praise the technical depth — the HIPS is genuinely strong. Casual users complain about popup fatigue (HIPS prompts on nearly every new app) and overly-strict defaults. Comodo has historically shipped browser components and Yahoo partnerships that users flagged as aggressive; the installer in 2025-2026 has settled but still presents optional components that users must decline.

What users criticize. UI is dense and intimidating for non-technical users. Default ruleset is aggressive enough to break legitimate applications until exceptions are added. Installer still presents bundled-offer checkboxes that many users click through without reading.

Who should pick Comodo CIS: technical users who want maximum behavioral control and are willing to manage the HIPS prompts. Not a good pick for non-technical family members.

#5 — Norton Smart Firewall: Bundled with Norton 360

Price: Norton Smart Firewall is not sold separately. Bundled with all Norton 360 tiers starting at $49.99 first year / $119.99 renewal for Norton 360 Deluxe (5 devices).

What it is. Norton 360's firewall component. Bidirectional filtering, application and trust-based rules, Intrusion Prevention System (IPS), and integration with the rest of the Norton suite. Decisions from Norton's cloud reputation service (SONAR) inform firewall behavior — known-trusted apps are allowed silently, unknowns prompt.

Features. Stateful inspection; IPS with signature-based attack blocking; Wi-Fi security scanning; Intrusion Auto-Block for known-attacker IPs; application-level rules with trust inheritance from Norton's cloud reputation.

What users say on the Norton Community forum and r/antivirus. The Smart Firewall is considered one of the more polished bundled firewalls — decisions happen silently for known apps (Chrome, Steam, Microsoft 365) and prompts surface only for truly unknown binaries. The downside is that you cannot install Norton Smart Firewall without buying the full Norton 360 suite — there is no standalone.

What users criticize. Bundled-only pricing; no free tier; renewal pricing for the parent Norton 360 suite can triple in year two (see our Norton 360 review for the renewal playbook).

Who should pick Norton Smart Firewall: users buying Norton 360 for the whole bundle (antivirus + VPN + 50 GB backup + optional LifeLock). The firewall is a benefit on top, not a standalone purchase.

#6 — Windows Defender Firewall: The Built-In Option (Often Correct)

Price: Free. Included with every modern Windows installation.

What it is. Windows Defender Firewall is a mature, kernel-level stateful packet filter built into Windows since XP SP2 and significantly improved in every major release since. In 2026 it filters inbound traffic aggressively by default, filters outbound traffic when configured (off by default for most programs), and integrates with Microsoft Defender's threat intelligence.

Features. Inbound and outbound filtering; per-profile rules (Domain, Private, Public); advanced rules via Windows Firewall with Advanced Security (WFAS) or PowerShell; IPsec integration; tight integration with Windows Defender and Microsoft Defender for Endpoint (on Pro/Enterprise editions).

What users say on r/windows and r/sysadmin. For most consumer-use cases in 2026, Windows Firewall is sufficient. Enabling outbound filtering in Block mode and explicitly whitelisting applications gives you behavior equivalent to most consumer third-party firewalls. The downside is entirely UX: the default Windows Firewall Control Panel is minimal, and advanced rule management requires wf.msc (Windows Firewall with Advanced Security) which is functional but dense.

What Windows Firewall does not do: HIPS (application behavior monitoring beyond port/IP filtering), sandboxing, real-time bandwidth visualization, friendly per-connection prompts. For those, third-party tools still add value.

Who should rely on Windows Firewall alone: most consumer users behind a home router in 2026. Combined with Windows Defender antivirus and good router hygiene, it covers the realistic threat model for home use.

Side-by-Side Comparison

Frequently Asked Questions

Do I need a third-party firewall in 2026?

For most Windows 11 home users behind a router with NAT: no. Windows Defender Firewall plus Microsoft Defender antivirus plus basic router hygiene covers realistic consumer threats. A third-party firewall adds value if you specifically want per-application outbound prompts (TinyWall, ZoneAlarm), network traffic visualization (GlassWire), or behavioral HIPS (Comodo CIS).

Is Windows Defender Firewall good enough?

Yes for inbound filtering (which is the primary network-threat vector). For outbound filtering you need to enable it manually (off by default) and configure application exceptions. Once configured, it is functionally equivalent to most consumer third-party firewalls; the difference is UX, not filtering power.

What is the best free firewall?

For most users: TinyWall if you want lightweight Windows Firewall management, ZoneAlarm Free if you want a standalone firewall with Check Point backing, Comodo CIS Free if you want HIPS and sandbox. Pick TinyWall for low overhead, ZoneAlarm for brand trust, Comodo for maximum behavioral control.

What is the difference between a firewall and an antivirus?

A firewall controls network traffic (which applications can connect outbound, which remote hosts can reach you). An antivirus inspects files and processes for malicious code. Modern threats require both layers — a firewall will not stop a trojan you downloaded and ran; an antivirus will not stop a running application from sending your data to an attacker if you have granted it network access. Most 2026 security suites (Norton 360, Bitdefender, Kaspersky) bundle both.

Does my router firewall replace a PC firewall?

Partially. Your router's NAT and stateful firewall block unsolicited inbound traffic from the internet — that is genuine protection. What the router does not do: filter traffic between devices on your LAN (a compromised smart TV could reach your PC), filter outbound traffic from your PC (malware phoning home), or apply per-application rules. A PC firewall adds those layers.

Are there any good firewalls for macOS?

macOS has a built-in application firewall (System Settings > Network > Firewall). For per-connection outbound prompts, Little Snitch is the widely-recommended paid option ($69 one-time or $2.99/month). For free, LuLu from Objective-See provides the same category of outbound-prompt functionality.

Why is Comodo's firewall controversial?

Two reasons. Technically, Comodo's HIPS is aggressive enough that it creates significant popup fatigue for non-technical users. Business-wise, older Comodo installers bundled browser toolbars and search partnerships that users flagged as unwanted; the current Comodo CIS installer in 2026 has settled, but a decade of reputation damage lingers on r/antivirus threads. The firewall engine itself is technically sound.

Is GlassWire a firewall or a network monitor?

Both, but primarily a network monitor. GlassWire uses Windows Firewall as its underlying filtering engine — GlassWire's UI is a friendly frontend over wf.msc. The standout value is the real-time visualization of per-app network usage and historical graphs. If you primarily want filtering power, TinyWall or Comodo are better picks; if you primarily want to see what your PC is doing on the network, GlassWire wins.

Final Picks

Best for most users: Windows Defender Firewall (free, built-in). Configure outbound filtering and move on with your life.

Best free third-party: TinyWall if you want a lightweight whitelist approach, ZoneAlarm Free if you want traditional outbound prompts.

Best for network visibility: GlassWire Basic at $35.88/year. Worth it if you want to understand your network traffic, not worth it if you just want filtering.

Best for technical power users: Comodo CIS Free. HIPS + sandbox is genuinely strong. Expect to manage prompts.

Best as part of a security suite: Norton Smart Firewall bundled with Norton 360 Deluxe at $49.99 first year. Do not buy Norton for the firewall; if you are buying Norton 360 anyway, the firewall is a solid included benefit.

The honest summary: the third-party firewall category is narrower than it was in 2010. Your router and Windows Defender Firewall together cover the threat model for most home users. Pick a dedicated firewall only if you have a specific requirement one of these products uniquely addresses.

BIS Kaspersky availability note: Kaspersky examples in this article are technical/contextual, not a fresh U.S. purchase recommendation. U.S. readers should check the Bureau of Industry and Security Kaspersky determination before buying, renewing, or installing Kaspersky-branded cybersecurity software.