simplewall vs Windows Firewall vs TinyWall vs GlassWire: Which is Best?
Published: August 15, 2025 | Updated: September 2026 | Category: Firewall Comparison
Selecting the right Windows firewall in 2026 is critical. While modern operating systems like Windows 11 and 10 come with built-in defenses, outbound network control and application-level telemetry filtering remain notoriously cumbersome to manage through default interfaces.
At a Glance: Architecture Comparison
| Feature | simplewall | Windows Firewall | TinyWall | GlassWire |
|---|---|---|---|---|
| Core Architecture | Direct Windows Filtering Platform (WFP) | Native Windows Service (MpsSvc) | Controller for Windows Firewall | Proprietary Driver + Windows Firewall |
| RAM Consumption | ~5 MB – 15 MB | Integrated (~20 MB) | ~25 MB – 40 MB | ~90 MB – 200 MB |
| License & Price | 100% Free & Open-Source (GPL v3) | Free (Built into OS) | Free (Closed Source) | Freemium ($39 - $99/yr) |
| Outbound Telemetry Blocking | Built-in XML Blocklists | Manual IP configuration required | Rule-based | Alerts only (Paid for block) |
| Background Service Required | No (WFP kernel rules persist) | Yes | Yes | Yes |
| Portable Mode | Yes (Zero installation needed) | N/A | No | No |
1. simplewall: Granular WFP Precision
Unlike conventional front-ends that merely tweak Windows Firewall rules, simplewall configures the Windows Filtering Platform (WFP) directly via Windows kernel APIs. This means simplewall does not require any third-party kernel driver or background daemon to remain running. Once your filtering rules are applied to the WFP provider, they remain active in the kernel even if simplewall is closed!
With simplewall, you get real-time toast notifications whenever an untrusted executable requests socket access, allowing you to permit or deny connections instantly. In addition, simplewall includes pre-configured blocklists for Windows telemetry, diagnostic tracking, and spyware endpoints.
2. Built-in Windows Defender Firewall: Solid Inbound, Weak Outbound
Windows Defender Firewall provides stellar inbound port protection. However, out of the box, it permits virtually all outbound traffic by default. Setting up granular outbound rules for every software executable requires navigating through layers of the MMC snap-in (`wf.msc`), making it impractical for everyday privacy-conscious users.
3. TinyWall: No-Popup Controller
TinyWall is designed to run silently without popup alerts. It enforces a strict whitelist model and modifies Windows Firewall rules. While effective, troubleshooting blocked applications can be tricky because it suppresses prompt dialogs, forcing users to manually enter learning or unblock modes.
4. GlassWire: Beautiful Visuals at a Resource Cost
GlassWire is renowned for its sleek graphs and bandwidth monitoring. However, it operates with a heavy memory footprint (often exceeding 150MB of RAM) and requires a paid subscription to unlock essential firewall features such as Ask-to-Connect and Evil Twin Wi-Fi detection.
Verdict: Why simplewall is the Power User's Choice
If your goal is transparent outbound traffic filtering, blocking Microsoft telemetry, and consuming virtually zero system resources without paying licensing fees, simplewall v3.8.7 is the definitive choice.