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ctrldStubby
Free

The proxy is free; Control D's filtering service is a separate product.

 Free

Free and open source under the BSD licence.

Windows, macOS, Linux, Self-hosted, Command line Windows, macOS, Linux, Command line
  • Forwards queries to encrypted DNS upstreams
  • Split-horizon and policy-based routing of queries
  • Encrypts the last mile of DNS for the whole machine, not just one browser
  • Strict profile refuses to fall back to unencrypted DNS
  • Configuration is file-based and aimed at technical users
  • Most documented use centres on Control D's own service
  • Configuration is a YAML file with no interface
  • Only protects the path to the resolver; the resolver still sees your queries
Downloadable app, Self-hosted Downloadable app
Open source Open source
License not stated License: BSD-3-Clause
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 24, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.