Little Snitch for Windows & Linux
Little Snitch is macOS-only. NetInsightPro is the Windows, Linux and Android answer to the same need: see what every app connects to, and stop the connections you don’t trust — with a cross-platform AI-agent and MCP layer no firewall on this list has.
On a Mac? NetInsightPro can’t block per-app traffic on macOS today — use Little Snitch itself, or the free, open-source LuLu. This page is for everyone Little Snitch leaves out.
The real options for Windows & Linux
A fair, side-by-side read of the per-app egress firewalls a Windows or Linux user actually has. Two of them — OpenSnitch and Portmaster — are free and open source, and for the base firewall function they, GlassWire and Little Snitch all block more granularly than NetInsightPro (per app / per connection, versus NetInsightPro’s per-host blocking). NetInsightPro earns its place on platform breadth and the AI/MCP/fleet layer below — not on being a cheaper or more granular firewall.
| Product | Platforms | Per-app egress visibility | Blocking granularity | Price | Open source |
|---|---|---|---|---|---|
| Little Snitch | macOS only | Yes — per app | Per-app / per-connection rules | €59 one-time | No (proprietary) |
| GlassWire | Windows, Android | Yes — per app | Per-app (click-to-block) | Free tier; Premium ~$2.99/mo per licence | No (proprietary) |
| OpenSnitch | Linux | Yes — per app | Per-app / per-connection prompts | Free | Yes — open source |
| Portmaster | Windows, Linux | Yes — per app | Per-app + DNS filtering | Free | Yes — open source |
| NetInsightPro | Windows, Linux, Android | Yes — per app | Per destination host (OS-firewall-enforced) — not per app | Free; Pro £12/mo (£100/yr) | No (proprietary) |
Prices and platforms as at September 2026 — verify current details with each vendor. Little Snitch pricing via third-party review sources; GlassWire and the open-source tools per each project’s own site.
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Cross-platform AI-agent & MCP visibility, with a fleet console
Developers now run Claude Desktop, Cursor and Copilot, and install MCP servers and tools in seconds — often with filesystem or shell access, appearing in no asset register. NetInsightPro is the one tool here that discovers them across a whole fleet, scores the risk with evidence, and lets you block in one click.
Discover AI agents & MCP servers
Find the AI agents and MCP (Model Context Protocol) servers and tools running across your Windows, Linux and Android devices — including native and CLI tools that browser-based controls never see.
Fleet inventory
A single inventory of what is running where — ownership, status and last-seen — so shadow AI and MCP supply-chain risk stop hiding in the gaps between machines.
Evidence-based risk scoring
Risk levels from Low to Critical with the evidence behind each verdict and drill-down. Vulnerability scanning is included and rolling out — today’s scoring is heuristic and evidence-backed, not deep per-package CVE analysis.
One-click block
Block or quarantine a risky agent, MCP server or destination in one click, with an audit trail. A firewall shows you connections; this is the layer that tells you which of them are AI, and lets you act on it.
We’re early to this category and honest about the edges: for deep per-server static analysis of an MCP server, a code-level scanner goes further, and NetInsightPro complements — not replaces — it. What NetInsightPro gives you that a firewall or a browser proxy cannot is fleet-wide endpoint discovery of what’s actually running, and one place to act on it.
What we won’t claim
A comparison you can trust says where it loses. Here is exactly what NetInsightPro does not do, so you can decide with clear eyes.
NetInsightPro runs alongside your antivirus, never instead of it. It watches where your apps send data; it does not scan files for malware or roll back ransomware.
Blocking is per destination host, enforced through the operating-system firewall — not per app process, and not by killing a live connection. If you need per-app rule prompts, OpenSnitch, Portmaster or Little Snitch (on a Mac) do that.
Vulnerability scanning is included and rolling out. Today’s risk scoring is heuristic and evidence-backed; we do not claim deep per-package CVE scanning.
There is no macOS per-app blocking. A macOS build is in review. On a Mac, use Little Snitch or the free, open-source LuLu — not NetInsightPro.
Frequently asked questions
See what your apps connect to — on Windows, Linux & Android
Start free on up to two devices, or go Pro for the AI-agent, MCP and fleet layer. Runs alongside your antivirus. Data stays on-device.
Curious about the AI/MCP layer? Explore AI-agent & MCP security.