COMPARISON
Looking for Little Snitch or LuLu on Windows?
Both are macOS-only. WinSight’s outbound firewall plays their role on Windows, free, open source, enforced at the kernel filtering layer.
What Little Snitch and LuLu are designed to do
Little Snitch, by Objective Development, is the best-known macOS application firewall: it alerts you when a program tries to connect out and lets you allow or deny it, with a paid license and a demo mode. LuLu, from Objective-See, is its free open-source counterpart, aiming to block unknown outgoing connections. Neither vendor offers a Windows version, which is why “Little Snitch for Windows” is such a common search.
Where WinSight fits
WinSight was built in the spirit of Objective-See’s tools, for Windows. Its outbound firewall enforces per-application block/allow through the Windows Filtering Platform, starts audit-only so you can observe before anything is blocked, and is armed only by an elevated operator through an authenticated channel. And because WinSight is a suite, the firewall comes with startup scanning, camera/mic monitoring and connection visibility under the same roof.
| Feature | WinSight | Little Snitch (macOS) |
|---|---|---|
| Platform | Windows 10/11 (x64, Arm64) | macOS only |
| Price | Free (GPL-3.0) | Paid, with demo mode |
| Open source | Yes | No |
| Per-application outbound block/allow | Yes, via Windows Filtering Platform | Yes (macOS network extension) |
| Observe-before-block mode | Yes (starts audit-only until armed | Yes) silent mode |
| Per-connection interactive prompts | No | Yes |
| Startup/persistence scanning included | Yes, 22 autostart families | No |
Where Little Snitch is stronger
- Per-connection interactive prompts (“allow once / allow forever / deny”). WinSight sets policy per application instead of prompting on each new connection.
- A mature, years-refined macOS UI with traffic maps and profiles. Little Snitch is an excellent product on its platform; if you are on a Mac, use it (or LuLu).
Where WinSight is different
- It runs on Windows 10/11: the platform these tools skip.
- Free and GPL-3.0 open source, like LuLu; no license purchase.
- Audit-first enforcement with honestly reported state: if enforcement cannot be verified exactly, it says Degraded, not Active.
- The firewall is one of eight visibility tools rather than a standalone product.
Evaluating the switch
- Install WinSight per-user (no admin rights needed) and explore the read-only tools first.
- When ready, install the firewall service from an elevated console. It starts audit-only.
- Review the audit log until the policies match your expectations, then arm enforcement from the dashboard.
Honest limitations
- No per-connection prompt workflow; blocking is per application.
- The Arm64 privileged runtime (which the firewall service is part of) is not yet qualified.
- Released binaries are not yet Authenticode-signed; verify checksums and build provenance instead.
Sources: www.obdev.at/products/littlesnitch/index.html · www.obdev.at/products/littlesnitch/index.html · objective-see.org/products/lulu.html · docs/WFP_DESIGN.md, checked 2026-07-24