# Simplewall (Firewall) Simplewall is a lightweight (<1 MB) network filtering utility for Windows that interfaces directly with the **Windows Filtering Platform (WFP)** rather than wrapping the built-in Windows Firewall. It lets you control which programs may access the network, blocking everything by default until you allow it. ## Key points - **Default-deny** — blocks all apps unless explicitly allowed via a rules editor. - **Built on WFP** — talks to Windows Filtering Platform APIs directly; runs alongside Windows Firewall independently. - **Logging** — dropped and allowed packet logging with notifications. - **Internal blocklist** — built-in rules to block Windows telemetry. - **Coverage** — WSL, Windows Store apps, IPv6, localization. - **Platform** — Windows 7 SP1+ (8/10/11), x64 and ARM64. - **Stack & license** — written in C; GPL-3.0. A minimalist alternative to heavier Windows firewalls like [[Fort (Firewall)]], and the Windows counterpart to Linux tools like [[OpenSnitch]]. ## References - Source code: https://github.com/henrypp/simplewall - Website: https://www.henrypp.org/product/simplewall ## Related - [[Firewall]] - [[Fort (Firewall)]] - [[OpenSnitch]]