WindowsSpyBlocker
WindowsSpyBlocker: A focused Windows toolkit for telemetry blocking across firewall, hosts, and DNS rule formats. Ranked #63 of 65 in Internet Filtering Software by our editors (3.0/10); pricing: Free plan; best for windows users blocking telemetry at firewall level.
At a glance
- Editor score3.0 / 10
- PricingFree plan
- Best forWindows users blocking telemetry at firewall level
- Free planYes
- Paid fromFree
- Facts checked22 Sep 2026
Where it wins
- Applies curated telemetry rules to the Windows firewall
- Generates hosts, DNSCrypt, OpenWrt, and firewall rule formats
- Open-source Go application distributed as a single Windows executable
Where it doesn't
- Windows-only platform support limits broader filtering use cases
- Documentation is dated
- Focused on telemetry and selected traffic rather than broad internet filtering
Our verdict on WindowsSpyBlocker
WindowsSpyBlocker is an open-source Go application for Windows users who want to block telemetry, data collection, and selected third-party service traffic. It is distributed as a single Windows executable and focuses on system-level filtering rather than general-purpose internet content controls. The project is particularly suited to users who want curated blocking rules that can be applied through Windows firewall and hosts-file mechanisms, with additional output for related tools and platforms.
Its main strength is the breadth of rule formats within that focused scope. WindowsSpyBlocker provides firewall and hosts-file blocking rules, generates DNSCrypt-compatible and OpenWrt-compatible rules, and supports formats for ESET Firewall and Kaspersky Firewall. It also includes development tools and Sysmon-related functionality. Downloads are available through GitHub releases, Chocolatey, and Scoop, giving Windows users several distribution options. These capabilities make it useful when firewall-level telemetry blocking matters more than a simple browser extension or a broad content-filtering suite.
The trade-off is its narrow platform and purpose. Windows is the supported platform, so it is not a fit for users seeking one filtering solution across multiple operating systems. Its emphasis on telemetry, tracking, and selected service traffic also makes it less suitable for users who need broad web-content controls. The project’s documentation is dated, although its GitHub repository and releases page are accessible. Choose WindowsSpyBlocker for open-source Windows telemetry rules and firewall-oriented control; choose another category tool when cross-platform coverage or wider internet filtering is the priority.
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WindowsSpyBlocker pricing
WindowsSpyBlocker fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Device limit | Not verified |
| Custom blocklists | Not verified |
| Safe search controls | Not verified |
| Filtering schedules | Not verified |
| Activity reports | Not verified |
| Platform support | Windows |
| Deployment | Desktop |
| Platforms | Windows |
| Support | Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | crazymax.dev |
| Facts checked | 22 Sep 2026 |
Alternatives to WindowsSpyBlocker
- Cloudflare GatewayA broad filtering gateway with strong policy controls and basic reporting.9.2
- Cisco UmbrellaA mature enterprise filter with broad controls, integrations, and contact-sales pricing.9.1
- Pi-holeFree, open-source network blocking for self-hosted administrators.9.0
See all WindowsSpyBlocker alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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