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Duck DNS vs Cloudflare DDNS: catalog facts
Duck DNS	Cloudflare DDNS
Free Free to use; supported by donations through Patreon.	Free The open-source tool is available without a license fee.
Web	Linux, Self-hosted, Command line
No paid tiers Simple, documented update mechanism	Handles IPv6 as well as IPv4 records Tiny container with one configuration file
Limited to the service's own subdomains Few features beyond basic dynamic DNS	Cloudflare-specific; it does not work with other DNS providers Requires an API token with DNS edit permission
Hosted service	Self-hosted
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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