17.9
GlassWire is a network traffic monitor and personal firewall for viewing network activity and controlling app connections.
Free planAndroidWebWindows
Best Personal Firewalls in 2026
These tools manage network connections on phones and computers. Use this list to compare tools by the devices they support, pricing, and whether the code is open source. For Android, confirm that a tool has an Android app and check what it covers. Then compare support for Windows, macOS, Linux or the web, along with free plans and trial terms.
27.1
Free planmacOS
37.1
Free planLinuxmacOSWindows
- 4
RethinkDNS
RethinkDNS combines a configurable DNS resolver with an Android firewall to block ads, trackers, malware, and other selected domains.
Free planAndroidWeb7.1From $1.75 a month - 5
AFWall+
Free planAndroid6.9$9.99 one-time - 6
OpenSnitch
Free planOpen sourceLinuxSelf-hosted6.9Free plan - 7
Radio Silence
macOS6.5$9 one-time - 8
Vallum
macOS6.5$15 one-time - 9
Little Snitch
macOS6.4From €59 a month - 10
Firewall App Blocker
Free planWindows6.3Free plan - 11
simplewall
Free planWindows6.2Free plan - 12
ZoneAlarm Free Firewall
Free planWindows6.2Free plan - 13
TinyWall
TinyWall is a free, open-source firewall for Windows, intended for private users, family PCs, and small-office or home-office computers.
Free planWindows6.1Free plan - 14
LuLu
LuLu is a free, open-source firewall for macOS that alerts about and blocks unknown outgoing network connections.
Free planmacOS6.0Free plan - 15
NetLimiter
NetLimiter is paid Windows software for monitoring internet traffic and controlling bandwidth.
Windows5.8 - 165.4Free plan
- 174.7
Choosing well
Start with Android support
If you need protection on a Xiaomi, Redmi or POCO phone, verify Android availability before looking at desktop features. NetGuard is listed with Android support.
Check what the Android app covers and whether its controls match your needs.
Match the platform
Personal firewall tools in this category can run on Windows, macOS, Android, the web or Linux. Confirm the platform listing for the device you plan to use.
A tool for one operating system may not cover another, so compare support across your phone, tablet and computer.
Compare plans and trials
Free-plan options include AFWall+, Firewall App Blocker, LuLu, NetGuard, OpenSnitch, Portmaster and RethinkDNS.
The list shows a 28-day NetLimiter trial; Radio Silence has a one-day trial and pricing from $9. Portmaster lists paid plans from €8 per month.
Check the code and licence
Certain listed tools provide open-source code. When code access matters, review each project's licence and documentation before selecting it.
Questions people ask
Which personal firewalls support Android?
NetGuard is listed with Android support. Check a tool's platform details and what its Android app covers before installing.
Can I use a free personal firewall?
AFWall+, Firewall App Blocker, LuLu, NetGuard, OpenSnitch, Portmaster and RethinkDNS are shown with free plans.
Do personal firewalls offer trials?
Trials shown include 28 days for NetLimiter and one day for Radio Silence.
Which platforms are covered?
Listed tools run across Windows, macOS, Android, the web and Linux. Check the platform listing for your device.
Are open-source personal firewalls available?
Several entries list open-source code. Review the project's licence and documentation if that matters to you.