Apps similar to Firewalla include Portmaster, which is open source with a free version. Other options are NextDNS, Adblock Plus, AdGuard and Pi-hole. Firewalls like Firewalla are a crowded field, with more than 25 alternatives for Linux, Windows, Android, Mac and iPhone.
Free, open-source privacy suite monitoring all network activity, blocking unwanted connections, using trusted filter lists for ads and malware, enforcing DNS-over-TLS, providing custom app and global rules, and supporting advanced privacy management.
Austria
EU
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.
United States
Adblock Plus is a free extension that allows you to - among other things - block annoying ads, disable tracking and block domains known to spread malware.
GermanyEU
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.
CyprusEU
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.
United States
Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on your computer.
Kazakhstan
An OpenSnitch-inspired firewall and network monitor + a pi-hole-inspired DNS over HTTPS client with blocklists.
United States
Quad9 is a free, recursive, anycast DNS platform that provides end users robust security protections, high-performance, and privacy.
Switzerland
Join DNS4EU, an EU initiative providing secure, private, and reliable DNS services for users across Europe.
CzechiaEU
Cloud DNS blocks ads, trackers, and malicious domains for all devices, provides real-time request stats, customizable filtering, parental controls, and a web dashboard. Compatible with routers, enables safer browsing, and ensures a privacy-focused internet experience.
CyprusEU
An ad blocker that uses the hosts file. The hosts file contains a list of mappings between hostnames and IP addresses. When an app requests an ad, that request is directed to 127.0.0.1 which does nothing.
GermanyEU
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.
Uzbekistan
