App Firewall: Network Monitor & Traffic Blocker for Mac

App Firewall: Network Monitor

See exactly which apps are talking to the internet on your Mac - and stop the ones that have no business doing it.

A live per-app view of every outgoing connection, with block rules you set once, a connection map showing where traffic goes, and data usage broken down by app. Monitoring happens on your Mac - no accounts, no telemetry, no traffic sent anywhere else.

macOS Per-app blocking Connection map On-device

Know What Your Mac Is Sending

Most apps phone home quietly. App Firewall makes that visible, then puts you in charge of what stays connected.

Per-App Control

Every app that reaches the network gets its own entry - allow it, block it, or watch it before deciding.

Block Rules That Stick

Set a rule once and it holds across restarts and updates, so a blocked app stays blocked.

Live Connection Monitor

Watch outgoing connections open in real time, with the app, destination, and port behind each one.

Connection Map

See where your traffic actually lands on a world map - useful when an app talks to somewhere unexpected.

Traffic Insights

Break down what is moving data, so a background sync hogging your connection stops being a mystery.

Data Usage by App

Track how much each app has sent and received - handy on tethered, metered, or capped connections.

Menu Bar at a Glance

A compact menu bar view shows current activity and lets you cut off an app without opening the window.

Connection Alerts

Get told when something new reaches out for the first time, instead of finding out months later.

Private by Design

Traffic is inspected on your Mac. Nothing is uploaded, no account is required, nothing is logged off-device.

Built for People Who Want an Answer

"Why is this app using the network?" should take seconds to answer, not an afternoon with a packet capture.

Privacy-Minded Users

Find out which apps quietly report back, and switch them off without uninstalling anything.

Developers & Testers

Watch what your own build talks to, and simulate an offline environment by blocking it on demand.

Metered & Travel Connections

On tethering or hotel Wi-Fi, stop background uploads before they eat the allowance.

Perfect For

Anyone who wants to know which apps talk to the internet, and how often.
Privacy-minded users who would rather block a phone-home than trust a settings toggle.
Developers checking what their own app reaches for at runtime.
People on tethering or metered plans who need background uploads to stop.
Anyone who noticed unexplained network activity and wants the app behind it named.

What Makes It Different

Per-app, not per-port: rules follow the app, so you never translate a decision into firewall syntax.
Connection map: destinations plotted geographically, not buried in a log.
Data usage per app: see who is spending your bandwidth, not just that it is gone.
Menu bar control: cut an app off mid-transfer without hunting for a window.
100% on-device: your traffic is analysed locally and never leaves your Mac.

Frequently asked questions

How is this different from the firewall built into macOS?

The built-in firewall governs incoming connections. App Firewall is about outgoing traffic: which of your apps is contacting the internet, where, and how much data it is moving - with per-app block rules that persist.

Can I see what an app is connecting to right now?

Yes. There is a live connection monitor, a connection map and data usage by app, plus connection alerts when something new starts talking.

Does the app itself send data anywhere?

No. It would be a strange tool for the job if it did - monitoring and rules stay on the Mac.

Which platform does it run on?

macOS. See whether macOS needs a firewall for the wider question.

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