# Safing Portmaster

Safing Portmaster is a Next-Gen Firewalls product by Safing. It runs on-premises. Pricing is free.

An open-source application firewall that monitors network traffic with custom rules

Checked October 2026.

## What is Safing Portmaster?

Safing Portmaster is an open-source application firewall that monitors and controls network traffic on Windows and Linux systems.

The tool provides visibility into all network connections made by applications on a device, allowing users to identify and block unwanted connections. It features system-wide tracker blocking that extends beyond browser protection to all applications.

Portmaster enables users to create custom filtering rules at both global and per-application levels. Users can completely block internet access for specific applications, filter connections based on geographical regions, or block peer-to-peer connections selectively.

The application includes a monitoring dashboard that displays real-time network activity, showing which applications are connecting to which domains. This helps users detect potentially malicious connections and take appropriate action.

Portmaster operates locally on the device and doesn't require cloud processing of network data. It's designed to enhance privacy by giving users control over their device's network communications.

The software is available for Windows, Debian/Ubuntu, and Fedora operating systems.

Tags: Linux, Open Source, Windows, Network Monitoring

## Where it fits in your security program (NIST CSF 2.0)

- [Protect](https://cybersectools.com/guides/building-protect-program-small-team): helps you prevent attacks and keep data safe.
- [Detect](https://cybersectools.com/guides/building-detect-program-small-team): helps you spot attacks and unusual activity.

## Quick facts

- Category: [Network Security](https://cybersectools.com/categories/network-security) · [Next-Gen Firewalls](https://cybersectools.com/categories/next-generation-firewalls)
- Vendor: [Safing](https://cybersectools.com/companies/safing) (Claimed listing)
- Deployment: On-Premises
- Company size fit: Startup
- Pricing model: Free
- Features: 10 listed
- Website: safing.io

The full feature and integration lists are on the page for signed-in visitors.

## Where it ranks

Safing Portmaster is not a pick on the current [Best Next-Generation Firewall Solutions for Business](https://cybersectools.com/shortlists/best-next-generation-firewalls).

## Awards

- Category Leader, Q3 2026: [Next-Gen Firewalls](https://cybersectools.com/categories/next-generation-firewalls)
- Category Leader, Q2 2026: [Next-Gen Firewalls](https://cybersectools.com/categories/next-generation-firewalls)
- Category Leader, Q1 2026: [Next-Gen Firewalls](https://cybersectools.com/categories/next-generation-firewalls)

How badges are earned: [/badges](https://cybersectools.com/badges)

## Safing Portmaster FAQ

### What is Safing Portmaster?

Safing Portmaster is a product by Safing in the Next-Gen Firewalls category. It covers Linux, Open Source and Windows.

### What is the pricing for Safing Portmaster?

Safing Portmaster is free. Download and setup instructions are at https://safing.io/.

### What are alternatives to Safing Portmaster?

Alternatives to Safing Portmaster listed on CybersecTools:

1. [Endian Firewall Community](https://cybersectools.com/tools/endian-firewall-community) - Endian Firewall Community is a free, open-source Linux-based firewall solution that provides network security, VPN access, email protection, and traffic management features for home networks. (Free)
2. [Monitorapp AISVA](https://cybersectools.com/tools/monitorapp-aisva) - SSL/TLS traffic decryption solution for security inspection (Commercial)
3. [Zecurion Secure Web Gateway](https://cybersectools.com/tools/zecurion-secure-web-gateway) - Web gateway controlling access to web resources with threat protection (Commercial)
4. [HAProxy Fusion Control Plane](https://cybersectools.com/tools/haproxy-fusion-control-plane) - Self-hosted control plane for managing multi-cluster HAProxy Enterprise deployments. (Commercial)
5. [ConexTI Proteux](https://cybersectools.com/tools/conexti-proteux) - UTM firewall appliance based on pfSense offering perimeter security (Commercial)

Compare all Safing Portmaster alternatives at [https://cybersectools.com/alternatives/safing-portmaster](https://cybersectools.com/alternatives/safing-portmaster)

### What deployment and organization size does Safing Portmaster fit?

Safing Portmaster is available as on-premises software. It is listed for startups. It is free.

## Compare Safing Portmaster with similar solutions

- [Safing Portmaster vs Endian Firewall Community](https://cybersectools.com/compare/endian-firewall-community-vs-safing-portmaster)
- [Safing Portmaster vs Monitorapp AISVA](https://cybersectools.com/compare/monitorapp-aisva-vs-safing-portmaster)
- [Safing Portmaster vs Zecurion Secure Web Gateway](https://cybersectools.com/compare/safing-portmaster-vs-zecurion-secure-web-gateway)

All alternatives to Safing Portmaster: [/alternatives/safing-portmaster](https://cybersectools.com/alternatives/safing-portmaster)

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Source: https://cybersectools.com/tools/safing-portmaster

For AI agents: every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md, and any compare page has a Markdown copy too (add .md to its URL).

More on Safing Portmaster and Safing: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=product-md