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

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