Portmaster AlternativesTop Firewalls & Network Monitors like Portmaster

Portmaster is described as 'Free and open-source tool that monitors all network activity, blocks unwanted connections, uses filter lists for ads and malware, enforces DNS-over-TLS, and sets custom app rules' and is a very popular Firewall in the security & privacy category. There are more than 25 alternatives to Portmaster for a variety of platforms, including Windows, Linux, Android, Mac and iPhone apps. The best Portmaster alternative is NextDNS, which is both free and Open Source. Other great apps like Portmaster are AdGuard, Pi-hole, simplewall and RethinkDNS.

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Alternatives
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Alternatives list

  1. NextDNS icon
     180 likes

    NextDNS protects you from all kinds of security threats, blocks ads and trackers on websites and in apps and provides a safe and supervised Internet for kids — on all devices and on all networks.

    147 NextDNS alternatives

    Cost / License

    • Freemium
    • Open Source (MIT)

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Chrome OS
    • BSD
    • iPad
    • UC Browser
    • Vivaldi
    • Google Chrome
    • UniFi Network
    • Safari
    • Yandex Browser
    • Software as a Service (SaaS)
    • OpenWrt
    • Opera
    • Alpine Linux
    • pfSense
    • Mozilla Firefox
    • DD-WRT
    • US flagUnited States
    NextDNS screenshot 1
    Good alternative?
     
  2. AdGuard icon
     303 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.

    136 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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  3. Pi-hole icon
     199 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.

    45 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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  4. RethinkDNS icon
     68 likes

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

    Cost / License

    Application type

    Platforms

    • Online
    • Android
    • Android Tablet
    • F-Droid
    • OpenAPK
    Good alternative?
     
  5. GlassWire icon
     157 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.

    73 GlassWire alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Windows
    • Android
    • Android Tablet
    Good alternative?
     
  6. Fort Firewall icon
     42 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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  7. 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.

    48 Little Snitch alternatives

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Mac
    • Linux
    Good alternative?
     
  8. InviZible Pro icon
     31 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
  9. 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.

    30 NetLimiter alternatives

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Windows
    Good alternative?
     
  10. OpenSnitch icon
     46 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.

    40 OpenSnitch alternatives

    Cost / License

    Application type

    Platforms

    • Linux
    Good alternative?
     
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    1
  11. 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.

    19 LuLu alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • US flagUnited States
    LuLu screenshot 1
    Good alternative?
     
12 of 40 Portmaster alternatives