Portmaster AlternativesOnly apps categorised as Firewalls

The best Firewall alternative to Portmaster is AdGuard, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Portmaster and many of them are Firewalls so hopefully you can find a suitable replacement. Other interesting Firewall alternatives to Portmaster are Pi-hole, simplewall, RethinkDNS and GlassWire.

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Most Portmaster alternatives are Firewalls, but you can also narrow the list to Network Monitors or Privacy Tools. Another popular filter is Open Source.
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Alternatives
Portmaster alternatives page was last updated

Alternatives list

  1. AdGuard icon
     306 likes

    Ad-blocking solution eliminating intrusive ads and preventing tracking, with malware protection. Filters pop-ups, banners, and more for clean browsing. Works in the background for ad-free surfing, protects data privacy with Spyware filter, and controls ad display in apps.

    138 AdGuard alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • HUAWEI AppGallery
    • iPad
    • Microsoft Edge
    • Vivaldi
    • Google Chrome
    • Samsung Galaxy Store
    • Safari
    • F-Droid
    • Android TV
    • Yandex Browser
    • Opera
    • Mozilla Firefox
    Good alternative?
     
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    1
  2. Pi-hole icon
     203 likes

    Blocks ads for all connected devices at the DNS layer without client setup. Provides web control, in-app ad and tracker blocking, DHCP and API support, regex filtering, privacy modes, audit logs, and long-term query analytics for network management.

    48 Pi-hole alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Linux
    • Self-Hosted
    • CentOS
    • Fedora
    • Ubuntu
    • Debian
    • Raspberry Pi OS
    • Raspberry Pi
    • US flagUnited States
    The Web interface shows how many ads were blocked, a query log, and more.
    Good alternative?
     
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    1
  3. RethinkDNS icon
     69 likes

    An OpenSnitch-inspired firewall and network monitor + a pi-hole-inspired DNS over HTTPS client with blocklists.

    51 RethinkDNS alternatives

    Cost / License

    Application type

    Platforms

    • Online
    • Android
    • Android Tablet
    • F-Droid
    • OpenAPK
    • Obtainium
    Good alternative?
     
  4. GlassWire icon
     158 likes

    Visualizes real-time and historical network activity, delivers alerts for suspicious behavior and unknown connections, manages firewall rules, reports DNS and system changes, identifies remote hosts, monitors app usage, supports remote monitoring, and detects possible threats.

    76 GlassWire alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Windows
    • Android
    • Android Tablet
    Good alternative?
     
  5. Fort Firewall icon
     44 likes

    Standalone firewall for Windows 7 and later featuring flexible rules by application, address, or protocol, wildcards, parent process filtering, SvcHost controls, blocklists, bandwidth graphs, traffic stats tracking, speed limits, and real-time network monitoring.

    Cost / License

    Application type

    Platforms

    • Windows
    Good alternative?
     
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    1
  6. Little Snitch icon
     139 likes

    Firewall application for monitoring and controlling outbound network connections, notifying users of attempted access, supporting rule-based blocking, real-time alerts on suspicious activity, and preventing unauthorized data transmission on macOS systems.

    51 Little Snitch alternatives

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Mac
    • Linux
    Good alternative?
     
  7. InviZible Pro icon
     32 likes

    InviZible Pro uses DNSCrypt Protocol, Tor and i2pd (I2P Daemon) (PurpleI2P) to achieve maximum security, privacy and comfortable use of the Internet.

    36 InviZible Pro alternatives

    Cost / License

    Application type

    Platforms

    • Android
    • Tor
    • I2P
    • OpenAPK
    • F-Droid
    Good alternative?
     
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    1
  8. NetLimiter icon
     95 likes

    Comprehensive Windows software for internet traffic control, enabling users to set bandwidth limits for applications or connections. Offers real-time monitoring, long-term stats per app, and detailed internet usage reports. Ideal for managing data efficiently and enhancing network performance.

    32 NetLimiter alternatives

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Windows
    Good alternative?
     
  9. OpenSnitch icon
     47 likes

    GNU/Linux firewall enabling interactive outbound network filtering, outbound application control, blocking of ads and malware domains, centralized GUI node management, input policy configuration, SIEM integration, real-time alerts, and user-level rule customization.

    Cost / License

    Application type

    Platforms

    • Linux
    Good alternative?
     
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    1
  10. LuLu icon
     56 likes

    Free shared-source firewall for macOS blocking unknown outbound connections unless approved, alerts for unauthorized activity, helps detect malware, blocks OS or app data transmissions, no ads or tracking, audit-ready code on GitHub, enterprise event monitoring.

    20 LuLu alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • US flagUnited States
    LuLu screenshot 1
    Good alternative?
     
  11. Minimal Firewall is a portable Windows firewall frontend that alerts users to internet connections without requiring custom kernel modifications or disabling core isolation, striking a balance between TinyWall's security and SimpleWall's functionality.

    Cost / License

    Application type

    Platforms

    • Windows
    Good alternative?
     
12 of 32 Portmaster alternatives