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OptimizerWindowsSpyBlocker
Free

Free and open source, no longer developed.

 Free

Free and open source under the MIT licence.

Windows Windows
  • Many privacy and performance tweaks in one portable program
  • Available in 24 languages
  • Single portable executable with no installer
  • Targets Windows telemetry and tracking specifically
  • Deprecated and archived; the author points users to OptimizerNXT
  • System tweaks such as stopping updates or disabling Defender can leave Windows less secure
  • Windows only
  • Blocking telemetry endpoints can affect some Windows features or updates
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0 License: MIT
No account needed No account needed
Works offline Works offline

Checked September 26, 2026

Checked October 2, 2026

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